View source for Scilab/C4/User-Defined-Input-and-Output/English-timed

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||''' Time'''

||''' Narration'''

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| 00:01
|Welcome to the spoken tutorial onFile handling  using Scilab. 

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| 00:06.
| In this tutorial, we will learn 

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|00:08
|'''Input Function '''

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|00:10
|'''Formatting the Output'''

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| 00:12
|'''save function '''

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|00:14
|'''load function '''

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| 00:16
|For Demonstration i am using Ubuntu Linux12.04 operating system with Scilab version 5.3.3 installed 

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| 00:26
| You should have Basic knowledge of '''Scilab.''' 

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|00:29
| If not, for relevant spoken tutorials on Scilab  please visit '''spoken hyphen tutorial dot org''' 

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|00.37
|The '''input()''' function is used to take the input from the user. 

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|00.42
| It provides a prompt in the text string for user input. 

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| 00.47

| It waits for input from the keyboard. 

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| 00.51
| If nothing but a carriage return is entered at the prompt, '''input()''' function returns an empty matrix. 

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| 00.59
| The '''input''' function can be written in two ways . 

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|01.03
| First ,x= input into brackets message to display  

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|01.09
|Second,x= input into brackets ("message to display","strings").

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|01.17
| In the second example, the second argument is '''“string”.''' 

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|01.22
|So the output is a character string, which is the expression entered using the keyboard. 

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|01.29

|Switch to the '''Scilab Console''' window and type, 

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|01.33

|'''x is equal to input''' open bracket inside double quotes '''Enter your age''' close the double quotes close the bracket and press enter.

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| 01.49

|Type 25 and press enter 

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| 01.53
|| Now type -->'''y is equal to input ''' into bracket into double quotes '''Enter your age''' close the double quotes comma again inside double quotes write '''string''' close the bracket and press enter 

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| 02.14
|| type 25 and press enter 

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|02.18

|| We see that in both the cases the input we entered through  keyboard, was a number 25. 

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|02.25

| Now, let us check the type of variable that x and y are. 

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|02.30

| Let us clear the console using '''clc''' command. 
 
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|02.34

|We are doing this to validate the use and importance of the argument “string”, given in the second example. 

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|02.42

|| To check the type of variable, let us type 

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|02.45

| -->'''typeof into brackets x'''and press enter 

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|02.51
|similarly; '''typeof(y)''' and press enter 

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| 02.57
||You can see it yourself, that the first answer stored in x is of type '''constant''' and 

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| 03.04
||second answer stored in y, with the argument '''“string”''' included in the command, is of '''type string.''' 

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|03.12

|| Let us now see how to format the output that is displayed on the console. 

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|03.17

| This can be done using the '''mprintf()''' function. 
 
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|03.22

| '''mprintf()''' function converts, formats and writes data on to the '''Scilab console.''' 

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| 03.28

|| It is an interface for C-coded version of '''printf''' function. 

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| 03.34
| Let us see an example for this.Switch to the console 

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|03.38
| Type-->'''mprintf into bracket into quotes type iteration percent i comma result is colon slash n alpha equal to percentf comma 33 comma 0.535 '''close the bracket, 

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|04.12
| Here 33 will be displayed in place of '''percent i '''and point 535 will be displayed in place of''' percent f''' as a flow, press enter

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| 04.26
| This will give the output as  '''At iteration 33, Result is alpha is equal to 0.535000. ''' 

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| 04.39
|Clear the console. Now let us see another example.

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| 04.44
| In '''print f''' open bracket into quotes '''value of x is equal to percentage d is taken as a constant comma while value of y is equal to percent s is taken as a string '''close the quotes comma '''x '''comma '''y '''close the bracket 

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| 05.19
|In the above example percentage d is used to insert a constant data stored in variable x and 

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|05.28
| '''percentage s''' is used to insert a '''string''' data stored in variable y. press enter you see the output 
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| 05.38
| Now, let us discuss the use of save and load command. 

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| 05.43

|To quit '''Scilab midway''' through a calculation and to 

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| 05.47
|| continue to a later stage type '''save thissession'''

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|05.52

||This will save the current values of all variables to a file called '''thissession.''' 

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|05.58

||This file cannot be edited. 

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| 06.01

|It is in '''binary''' format. 

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| 06.04

| When you next start Scilab, type '''load thissession'''

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|06.08
| and the computation can be resumed where you left off. 

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| 06.13

| The purpose of '''save''' and '''load''' function are 

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|06.16

||The '''save()''' command saves all the '''scilab''' current variables in a binary file. 

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|06.22

| If the variable is a graphic handle, the '''save''' function saves all the corresponding graphics_entities definition. 

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| 06.31

| The file can be given either by its paths or by its descriptor previously given. 

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| 06.37

|'''save(filename)''' saves all the current variables in a file defined by filename. 

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| 06.45

| '''save into bracket fd''' saves all the current variables in the file defined by the descriptor fd. 

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| 06.53

| '''save(filename,x,y) or save(fd,x,y)''' saves only named variables x and y. 

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| 07.02

||Let us see an example to illustrate the save and load commands usage. 

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| 07.07

||Switch back to the console . Let us define two matrices say a and b 

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| 07.14

||-->'''a = eye of (2,2)''' and press enter 

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| 07.22

|Type;'''b=ones(a)''' and press enter 

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| 07.28

|Clear the console using clc command. Now type 

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|07.34

|-->''' save space matrix dash a dash b''' 

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|07.42

| or it can also be written as 

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| 07.46

| '''save ''' into brackets into quotes '''matrix dash a dash b dot dat'''  close the quotes comma ''' a''' comma ''' b''' close the braket  and press enter 

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|08.03

|| This saves the values of variables in a binary file '''matrix dash a dash b dot dat''' in the present working directory. 

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| 08.12

| You can browse the present working directory to check the existence of this binary file.  
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| 08.17

|You can see it here. I will close the file browser. 

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| 08.22

| Now let us load the file back in to the variables. 

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| 08.26

| Before this, let us clear the variables '''a and b '''

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| 08.29

| Type  '''clear a space  b ''' press enter 

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| 08.34

| Let us cross check if these variables are really cleared. 

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| 08.39

| ->'''a  ''' 

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| 08.40

|'''b'''

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| 08.41

| Now let us load back the values from the binary files in these variables a and b using the load command. 

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| 08.49

|Type ''' Load '''into bracket into quote '''matrix dash a dash b dot dat''' close the quotes comma into quotes '''a comma''' into quotes '''b''' close the bracket and press enter 

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| 09.08

| Let us check the values in variables a and b. Clear the console. 

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| 09.14

| Type >a And-->b 

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| 09.18

| You can see the values are loaded back in the variables. 

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| 09.23

| In this tutorial we learnt - 

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| 09.24

| Input Function using '''input''' command 

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| 09.28

| Formatting the Output using''' mprintf''' command 

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| 09.31

| '''Save Function '''

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| 09.33

| '''Load Function''' 

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|09.35

| Watch the video available at the link shown below 
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| 09.38

| It summarises the Spoken Tutorial project 

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|09.41

||If you do not have good bandwidth, you can download and watch it 

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|09.46

||The spoken tutorial Team

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|09.48

||Conducts workshops using spoken tutorials 

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|09.51

||Gives certificates to those who pass an online test 

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|09.54

||For more details, please write to conatct@spoken-tutorial.org 

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|10.01

|Spoken Tutorial Project is a part of the Talk to a Teacher project 

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| 10.05

| It is supported by the National Mission on Eduction through ICT, MHRD, Government of India. 
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| 10.12

|More information on this mission is available at  http://spoken-tutorial.org/NMEICT-Intro

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| 10.23

|This is Anuradha Amrutkar from IIT Bombay signing off.

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|10.26

| Thank you for joining.