View source for Scilab/C4/Developing-Scilab-Toolbox-for-calling-Python-and-its-functions/English

{| style="border-spacing:0;"
| style="background-color:#c0c0c0;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| <center>'''Visual Cue'''</center>
| style="background-color:#c0c0c0;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| <center>'''Narration'''</center>

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| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Slide 1:

| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Welcome to the''' s'''poken tutorial on''' Developing Scilab Toolbox for calling Python and its functions'''

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| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Slide 2:

Learning Objectives
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| In this tutorial we will learn about how to

* Build a '''toolbox'''
* Load a '''toolbox''' and
* Execute the '''Python functions''' in '''Scilab'''

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| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Slide 3:

Systems Requirements
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| To record this tutorial, I am using

* '''Ubuntu Linux OS '''version 18.04 and 
* '''Scilab''' version 6.1.0
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| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Slide 4:

Pre-requisites

[https://spoken-tutorial.org/ https://spoken-tutorial.org/]

| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| To practice this tutorial, you should have basic knowledge of programming in 

* '''Scilab'''
* '''Python '''and
* '''C++'''

If not, then go through the relevant tutorials on this website.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Slide 5:

Software prerequisite:

| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Make sure that you have installed the below software.

* '''Scilab''' version 6.1.0
* '''Python''' version 3.8
* '''gcc''' and '''g++''' version 5.4 or above

Note that your '''Linux OS''' version should be 18.04 and above.

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| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Slide 6:

Scithon Toolbox

* We will call the Scilab-Python Interfacing toolbox by the name '''Scithon'''.

* '''Scithon '''toolbox is used to call the Python functions inside '''Scilab.'''

| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| In this tutorial, we will call a '''Scilab Python Interfacing toolbox''' by the name '''Scithon'''.

'''Scithon toolbox''' is used to call the '''Python functions''' inside '''Scilab.'''

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Slide 7:(a)

Additional reading material
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Refer to the '''Additional reading material '''link for

1. Installation of '''Python''' 3.8 on '''Ubuntu Linux OS'''

2. Reference material for the procedure to make the '''Scithon toolbox'''.

3.About '''gateway functions''' used in this tutorial


This link is available below the video player of this tutorial.

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| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Slide 7:(b)

Additional reading material
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Please read the document to understand the concepts of 

* Creating a '''custom type''' to hold '''Python variables'''
* Creating '''gateway functions''' using '''custom variable''' and
* Building the '''toolbox'''

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| 
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| I’ll show a demo with a sample '''Scithon toolbox''' which is already created.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Point to the folders and files as per narration

| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| I have saved '''scithon.zip '''and '''header.zip''' files in the folder '''Scilab_hackathon.'''

Extract the files and keep it in the same folder.

Note that '''header.zip''' file is required only for '''Linux''' users.

The '''Linux''' version of '''Scilab''' requires some additional '''header files'''.

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| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Slide 8:

Code files:

| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| 
* The files used in this tutorial are available in the '''Code Files''' link on this tutorial page. 
* Please download and extract them
* Make a copy and then use them while practising.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Open the header folder
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Let us see the content of the '''header''' folder.

This '''header''' folder contains two '''hxx''' files: '''OptionalDecoration.hxx''' and '''DollarInfo.hxx.'''

It has a folder named '''data''', containing three '''hxx''' files. 

They are '''Clone.hxx, LoopDecoration.hxx''' and '''VarPromotion.hxx'''

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| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Slide 9(a):

About header folder:
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| 
*The files under the '''header''' folder are available in the '''Windows''' latest version of '''Scilab'''.

*These files are not available in the '''Linux''' version of '''Scilab'''.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Slide 9(b):

About header folder:
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| 
*We need to copy these files and '''data''' folder to the '''Linux Scilab''' version.

*So that compilation of the '''Scithon toolbox''' under '''Linux''' will work.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Go to the header folder

Copy the files
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Go to the '''header''' folder.

Copy the 2 '''hxx''' files and '''data''' folder.

We need to paste in the '''Scilab directory.'''

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Go to the header folder

Copy the files

Show a demo
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| I have downloaded '''Scilab 6.1.0''' in my '''Downloads''' folder.

Go to : '''Downloads''' then '''scilab-6.1.0''' then '''include''' then '''scilab directory'''.

Paste the copied files.

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| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Slide 10:

Scilab 6.1.0 - apt-get command
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| If you are using '''Scilab 6.1.0''' install via '''apt-get '''command. 
Copy these files inside
'''/usr/include/scilab directory'''.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Slide 11:

BlockDiagram1.png
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| This diagram shows the '''interfacing''' between '''Scilab''' and '''Python''' using “'''Python API for C/C++'''”

This may apply to most '''interfaces''' between '''Scilab''' and any '''open source software/library'''.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| 
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| We will see the detailed representation of the '''Scithon toolbox'''.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Slide 12:

BlockDiagram2.png

point to various blocks
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| The top block represents code that uses '''Python API for C/C++.'''

The middle block represents '''gateway functions'''.

This transfers '''data''' between '''Scilab''' and '''Python API '''code.

The bottom block represents '''Scilab. '''

In our case, we are particularly making use of the '''data types''' available with '''Scilab'''.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| 
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Next we will see about the important '''directories''' and files involved.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Double click on the src directory
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Go to the '''Scithon''' folder.

Double click on the '''src''' folder.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Point to the sub directories
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Here we can see''' C and CPP '''folders.

It contains files used for starting the '''Python instance''' and '''overloaded virtual functions.'''

|-
| style="background-color:#ffffff;border-top:none;border-bottom:1pt solid #000001;border-left:1pt solid #000001;border-right:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| open the file '''PythonInstance.c''' 
| style="background-color:#ffffff;border-top:none;border-bottom:1pt solid #000001;border-left:1pt solid #000001;border-right:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Let us open the file '''PythonInstance.c''' in the '''C''' folder.

The code for creating''' Python Instances''' is written by the '''toolbox developers'''.

This file sets up a way to capture the '''Python console''' output.

It then starts an instance of the '''Python interpreter'''.

Close the file.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Point to cpp

Open the file '''PyVar.cpp'''
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Go to the '''CPP '''folder.

Open the file '''PyVar.cpp'''

This file contains the '''overloaded virtual functions''' written by the '''Scithon''' developers.

It defines the behaviour of the custom '''Python data type''' used in the '''toolbox'''.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Highlight according to narration

Highlight hasToString, toString, extract, isInvokable and invoke.
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| In '''PyVar.cpp,''' we have added a '''data member''' for storing our '''Python variable'''.

This '''data member''' will hold the actual '''Python data''' with the '''type''' as '''PyObject'''

Next step is to '''overload''' the '''virtual functions''' that make up a '''Scilab data type'''.

For example,''' hasToString, toString, extract, isInvokable '''and '''invoke  functions''' are '''overloaded'''. 

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| '''Python.h is available under '''

/'''usr/include/python3.8'''

| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| It uses '''Python’s extended''' and '''embedded API''' for '''C/C++'''.

This is provided by the '''header''' file '''Python.h.'''

We can find this '''header''' file under the '''directory /usr/include/python3.8'''

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Open the file PyVar.hxx and highlight user.hxx

'''user.hxx '''header file is available under your_'''scilabinstalltiondirectory/include/Scilab/'''
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Let us open the file '''PyVar.hxx '''which is written by the '''Scithon developers'''.

This is available under the '''directory scithon/src/cpp/'''

This implements all the core '''functionalities''' that makes up a '''Scilab data type'''.

This is done by '''class UserType''' provided by the '''header''' file '''user.hxx.'''

We can find this '''header''' file under the '''directory scilabinstalltiondirectory/include/Scilab/'''

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Slide 13:

Reference Links : '''PyVar.CPP''' 

| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Please refer to the below links to understand the code inside the '''PyVar.CPP''' file.


These links are available in the '''Additional reading material''' link.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Go to C and CPP folder
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| '''C''' and '''CPP directory''' contains a '''builder script''' of '''Scithon toolbox'''.

This is called during the '''toolbox build process'''.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Point to .sce files in the c and cpp folder
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| The '''C directory''' contains the '''builder_c.sce''' file.

And the '''CPP directory''' contains the '''builder_cpp.sce''' file.

These files are available in the '''Scilab toolbox development skeleton'''.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Slide 14:

Builder script of scithon toolbox.

| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| We have downloaded this from '''scilab.org''' and modified it to build the '''Scithon toolbox''' for '''Linux'''.

These '''scripts compile''' the''' C '''or '''CPP''' code and generate shared '''object''' files.

These shared '''object''' files will be used by the '''Scithon toolbox'''.

Then '''Scilab''' will call the '''implemented functions'''.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| 
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Next we will see about '''gateway functions'''.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Go to the sci_gateway directory
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Go to the '''sci_gateway directory''' in '''Scithon''' folder.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Go to the folder cpp.
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Go to the '''cpp '''folder.

This '''directory''' contains '''gateway functions''' required for the '''toolbox'''.

This acts as an '''interface''' between '''Scilab''' and '''Cpp''' through which '''interface''' is made with '''Python'''. 

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Point to the functions
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| The '''Scithon toolbox''' has 11 '''functions''' and 1 '''overloaded function'''.

New '''functions''' such as '''py, pyDict, pyEquals '''etc are created to call the '''Python utilities''' in '''Scilab'''.

We need to create individual '''gateway functions''' for each '''function''' as shown here.

These are the '''functions''' that we want to '''interface''' with '''Python'''.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Refer to the '''Additional reading material '''link for each of the '''gateway functions'''.

| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Refer to the '''Additional reading material '''link for more details on each of the '''gateway functions'''.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Open the '''builder_gateway_cpp.sce''' 

highlight the lines 20 to 23

highlight the lines 6 to line 16 for function names and lines 28 to 38 for gateway files.

| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Let us open the '''builder_gateway_cpp.sce''' file found in the same folder.

This is used to configure the '''build process'''.

It contains settings for where to find the '''headers''' and '''libraries'''.

It also contains the list of '''function''' names and the corresponding '''gateway files'''.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| 
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Next we will see how to build the '''toolbox'''.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Open the terminal
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Open the '''terminal''' by pressing '''Ctrl+Alt+ t '''keys simultaneously.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Type '''sudo updatedb'''

Type''' locate libpython3.8.so'''

Highlight the path

'''/usr/lib/python3.8/config-3.8-x86_64-linux-gnu'''
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Type '''sudo updatedb.'''

Enter the '''system password''' if prompted.

Type '''locate libpython3.8.so '''and press '''Enter'''. 

This will give you a search result for where this file is located on your system.

I’m getting the '''path''' as shown here. 

Copy the location of the file.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Open the '''Scithon/etc '''folder and open the file '''scithon.start'''
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Open the '''scithon/etc '''folder and open the file '''scithon.start'''

Locate the line for '''link function''' and check for the '''file path'''. 

If the '''path''' is different, then paste the '''path''' which we copied earlier.

Save and close the file.

|-
| style="background-color:#ffffff;border-top:none;border-bottom:1pt solid #000001;border-left:1pt solid #000001;border-right:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| 
| style="background-color:#ffffff;border-top:none;border-bottom:1pt solid #000001;border-left:1pt solid #000001;border-right:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Now let us execute the '''Python functions''' in '''Scilab'''.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Open scilab 6.1.0
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Open '''Scilab 6.1.0'''

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| click on the '''File menu>> Browse for new'''
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| In the menu bar, click on the '''File menu''' and click on the '''Browse for new '''option.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Browse to '''Scithon''' directory
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| In the new window, browse to '''Scithon directory'''.

And click on the '''Ok''' button.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| type '''exec builder.sce'''
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| On the '''Scilab console''', type '''exec builder.sce''' and press '''Enter.'''

This will '''build''' the '''toolbox'''. 

Wait until it is completed successfully.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| type '''exec loader.sce '''a
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Now type '''exec loader.sce '''and press '''Enter'''.

This will load the '''toolbox'''.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Type '''help''' and press Enter.

select '''Scithon'''
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Type '''help''' and press '''Enter'''. The '''Help''' window will open.

On the left panel, select '''Scithon''' from the list.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Point to the functions.
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| On the right side panel, we can see the '''functions''' offered by this '''toolbox'''.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| 
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| In order to start using this '''toolbox''', first execute the command '''startPy.'''

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| type '''startPy''' 
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Switch to the '''Scilab console''' and type '''startPy''' and press '''Enter'''.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| 
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Now let us see how to do simple '''Python''' computation using this '''toolbox'''.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| py("a = 50; b = a**2;print(b)")
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| In the '''Help''' window, click on the '''function py'''.

Copy the example code as shown and paste it in the '''Scilab console'''.


And press '''Enter'''.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Point to the output
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| The '''py function''' is used to execute simple '''Python statements'''.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Highlight the output
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Notice that the input '''statement''' is of '''type string''' as well as the output.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Click on '''pyList'''

| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Switch to the '''Help''' window.

Click on '''pyList'''

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| '''X = pyList(1,2,"Hello",3) '''
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| The '''pyList function''' is used to create '''Lists'''.

Copy the following code and paste it in the '''Scilab console''' and press '''Enter'''.

You can see that it has created the '''list X'''.

|-
| style="background-color:#ffffff;border-top:none;border-bottom:1pt solid #000001;border-left:1pt solid #000001;border-right:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| '''Type X.append(10) '''
| style="background-color:#ffffff;border-top:none;border-bottom:1pt solid #000001;border-left:1pt solid #000001;border-right:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Type '''X.append(10)''' 

Type '''X''' to display the output.

It shows that the '''list''' has been appended with a new '''member'''.

|-
| style="background-color:#ffffff;border-top:none;border-bottom:1pt solid #000001;border-left:1pt solid #000001;border-right:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| '''Point to pyList , append'''
| style="background-color:#ffffff;border-top:none;border-bottom:1pt solid #000001;border-left:1pt solid #000001;border-right:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Note that the '''pyList() function''' is written by '''Scithon toolbox developers''' to create a '''Python list'''. 

'''Append() function''' is an '''inbuilt Python function'''.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| 
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| The '''toolbox''' facilitates the basic '''interface''' of '''Scilab''' with '''Python'''. 

The users are encouraged to explore the remaining '''functions''' in the '''Help''' window.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| 
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| With this we come to the end of this tutorial

Let us summarize.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Slide:6

summary
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| In this tutorial we learnt to

* Build a '''toolbox'''
* Load a '''toolbox'''
* Execute the '''Python functions''' in '''Scilab'''
|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Slide 7:

About Spoken Tutorial project
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| The video at the following link summarises the Spoken Tutorial project.Please download and watch it

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| '''Show Slide:'''FOSSEE Forum
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| For any general or technical questions on '''Scilab''', visit the''' FOSSEE''' forum and post your question. 

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| '''Show Slide:'''

'''Textbook Companion '''project.

| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| The '''FOSSEE '''team coordinates the '''Textbook Companion '''project.

We give''' Certificates '''and '''Honorarium''' to the contributors.

For more details, please visit this site.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| '''Show Slide:'''

Lab Migration
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| The '''FOSSEE '''team coordinates the '''Lab Migration '''project.

For more details, please visit this site.

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Slide 9:

Acknowledgement
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| Spoken Tutorial project is funded by MHRD, Government of India. 

|-
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| 
| style="background-color:#ffffff;border:1pt solid #000001;padding-top:0cm;padding-bottom:0cm;padding-left:0.206cm;padding-right:0.191cm;"| This is Nirmala Venkat from Spoken Tutorial project, IIT Bombay, signing off. 

Thanks for watching.

|}