Sandhya.np14 at 10:16, 20 August 2018

2018-08-20T10:16:47Z

Pratik kamble at 11:51, 3 April 2018

2018-04-03T11:51:27Z

Jyotisolanki: Created page with "{| border=1 ||''' Time ''' ||'''Narration''' |- || 00:01 || Welcome to the Spoken Tutorial on '''Array Functions and Operations'''. |- || 00:07 || In this tutorial, we are g..."

2017-10-04T09:45:00Z

Created page with "{| border=1 ||''' Time ''' ||'''Narration''' |- || 00:01 || Welcome to the Spoken Tutorial on '''Array Functions and Operations'''. |- || 00:07 || In this tutorial, we are g..."

New page

{| border=1
||''' Time '''
||'''Narration'''

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|| 00:01
|| Welcome to the Spoken Tutorial on '''Array Functions and Operations'''.

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|| 00:07
|| In this tutorial, we are going to learn: how to use '''OMShell''' , how to use '''array construction functions'''.

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|| 00:17
|| how to perform '''arithmetic operations''' on '''vectors''' and '''matrices'''.

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|| 00:23
||how to use '''array conversion functions'''.

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|| 00:27
|| To record this tutorial, I am using '''OpenModelica 1.9.2''' '''Ubuntu Operating System version 14.04''' and '''gedit'''

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|| 00:40
||'''Windows''' users may use any text editor like '''Notepad''' instead of '''gedit'''.

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|| 00:47
|| To understand and practice this tutorial, you need knowledge of '''function''' and '''array declaration''' in '''Modelica'''.

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|| 00:56
||Prerequisite tutorials are mentioned on our website. Please go through them.

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|| 01:02
|| Let us learn more about '''OMShell''' now.

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|| 01:06
||'''OMShell''' is an interactive command line tool.

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|| 01:10
||It is a part of '''OpenModelica'''.

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|| 01:13
||'''OpenModelica compiler''' can be invoked using '''commands''' typed in '''OMShell'''.

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|| 01:20
||It can be used for loading '''classes''' and simulating them.

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|| 01:25
||'''Functions''' can also be called in '''OMShell'''.

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|| 01:29
|| We shall now use '''classes''' named '''polynomialEvaluatorUsingVectors''' and '''functionTester''' to demonstrate '''OMShell'''.

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|| 01:38
||These '''classes''' were discussed in previous tutorials.

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||01:42
||For more information on these '''classes''', please watch the prerequisite tutorials.

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||01:48
||All the '''commands''' to be used in this tutorial are provided in a file named '''OMShell-commands.txt'''.

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|| 01:57
||You may locate and download all the '''code files''' available on our website.

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|| 02:03
||Please save all these code files in one directory for easy access.

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|| 02:09
|| Now let me launch '''OMShell'''.

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|| 02:12
||To open '''OMShell''' on '''Ubuntu''' Operating System, click on '''Dash Home''' icon at top left in the launcher.

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|| 02:21
|| Type '''OMShell''' in the search bar.

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|| 02:25
||Click on '''OMShell''' icon.

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||02:28
||In '''Windows''', you may find the icon in '''Start''' menu.

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|| 02:33
|| Now, let us learn a few useful commands.

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|| 02:37
||Firstly, go to the location where you saved the text file named '''OMShell-commands.txt''' and open it.

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|| 02:47
||Note that this file has all the '''commands''' to be used in this tutorial.

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|| 02:52
||Hence, you may refer to this file whenever in doubt.

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||02:57
||Now let me switch to '''OMShell'''.

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|| 03:00
|| Type '''cd open and close parentheses'''.

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|| 03:05
||Press '''Enter''' to display the result produced on execution of the '''command'''.

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|| 03:11
|| This prints the path to current directory.

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||03:15
|| Now let us change current directory to the location where you have saved the '''code files'''.

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|| 03:22
|| Let me change directory on my system.

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|| 03:25
||Type '''cd'''(open and close parentheses) (within double quotes), specify the path. Press '''Enter'''.

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|| 03:38
|| Note that a '''Windows''' path uses '''forward slash''' unlike the '''backward slash''' used in '''Ubuntu'''.

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|| 03:46
||'''Windows''' users need to be cautious of this fact.

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|| 03:51
|| Now let us load '''polynomialEvaluatorUsingVectors''' function.

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|| 03:57
||Type '''loadFile''' (within parentheses) (within double quotes) '''polynomialEvaluatorUsingVectors.mo'''.

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||04:11
||Note that '''F''' is upper-case in '''loadFile()''' command.

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||04:16
||This command can be used to load '''class''' or '''model''' files with a file extension of '''.mo'''.

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|| 04:25
||Now press '''Enter'''.

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|| 04:28
|| If the file is found, '''OMShell''' returns '''true'''.

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|| 04:33
|| Now let us call this function interactively.

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|| 04:37
||Type '''polynomialEvaluatorUsingVectors''' (with an argument of) '''10'''. Press '''Enter'''.

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|| 04:47
|| This command takes an input argument of '''10''' units and displays the result.

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|| 04:55
|| Let me now load '''functionTester class'''.

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|| 04:59
||Type '''loadFile''' (open and close parentheses) (within double quotes) '''functionTester.mo'''. Press '''Enter'''.

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|| 05:12
|| Now let us simulate '''functionTester class'''.

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|| 05:16
||Type '''simulate''' (within parentheses) '''functionTester''' (comma) '''startTime''' (equals) '''0 stopTime''' (equals) '''1'''. Press '''Enter'''.

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|| 05:32
|| The simulation is now complete.

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||05:35
||Let us plot variable '''z''' from '''functionTester''' class.

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|| 05:40
|| Type '''plot''' (within parentheses) (within curly braces) '''z''' and press '''Enter'''.

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|| 05:50
||This command generates a plot of variable '''z''' vs '''time'''.

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|| 05:56
|| Now let me go back to the slides.

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|| 06:01
|| '''Array construction functions''' are used to construct '''arrays''' of given size.

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|| 06:06
||Now let us take a look at a few '''array construction functions'''.

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|| 06:11
||We will also practice them using '''OMShell'''.

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|| 06:15
||'''fill()''' is function used to create an '''array''' with all the elements same. :The syntax for '''fill''' is as shown.

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|| 06:25
||First '''argument''' represents the number which fills the '''array'''.

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|| 06:29
||Remaining '''arguments''' represent the size of each dimension.

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|| 06:34
||'''zeros()''' is a function used to create an '''array''' filled with zeros. : Syntax for '''zeros()''' function is as shown.

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|| 06:44
||'''Arguments''' represent the size of each dimension of the array.

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|| 06:50
||'''identity()''' function creates an identity matrix. It takes one '''argument''' that represents the size of both dimensions.

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|| 07:02
|| Now let me demonstrate these functions using '''OMShell'''.

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|| 07:06
||Let me go back to '''OMShell'''.

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||07:09
|| Type '''fill'''(within parentheses)''' 5''' (comma) '''2''' (comma) '''2'''.

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|| 07:16
||This command generates a two by two matrix with all its elements being '''5'''.

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|| 07:24
||The first '''arguments''' represents the element to be filled within the '''array'''.

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|| 07:30
||'''2''' represents the size of first dimension.

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|| 07:30
||and the third argument '''2''', represents the size of second dimension.

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||07:40
||Now press '''Enter'''.

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||07:43
||The result is as expected.

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|| 07:46
||Elements with one set of curly braces represent a row.

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|| 07:52
||Hence this matrix has two rows and two columns.

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|| 07:57
|| Now let us use '''zeros() function''' to create a (two by two) matrix with all its elements '''zero'''.

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|| 08:05
|| Type '''zeros''' (within parentheses) '''2''' (comma) '''2''' and press '''Enter'''.

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||08:13
||The result is as expected.

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|| 08:16
|| Let us now try '''identity function'''.

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|| 08:19
||Type '''identity(3)'''.

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|| 08:23
||This creates an '''identity''' matrix which is '''3''' (by) '''3''' in its size.

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|| 08:29
|| We can also perform '''arithmetic operations''' and use '''assignment statements''' in '''OMShell'''.

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|| 08:36
||Let us create two matrices and perform '''arithmetic operations''' on them.

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|| 08:42
|| Type '''a''' (colon) (equals) (within square brackets) '''1''' (comma) '''2''' (semicolon) '''3''' (comma) '''4'''.

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|| 08:54
||'''Comma''' is used to separate elements in a row

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|| 08:58
||whereas '''semi-colon''' is used to separate rows themselves. Now press '''Enter'''.

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|| 09:07
|| Type '''b''' (colon) (equals) '''identity (2)'''.

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|| 09:15
||This generates a '''2 by 2 identity''' matrix.

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|| 09:19
|| Now let us perform '''arithmetic operations''' on '''a''' and '''b'''.

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|| 09:24
||Type '''a''' (plus) '''b''' and press '''Enter'''.

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|| 09:29
||This performs matrix addition.

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|| 09:32
|| Type '''a''' (asterisk)''' b'''.

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|| 09:36
||This performs matrix multiplication. Press '''Enter'''.

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|| 09:42
|| Type '''a''' (dot) (asterisk) '''b''' and press '''Enter'''.

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|| 09:49
||This performs element-wise multiplication of the two matrices.

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|| 09:55
|| Note that it is not necessary to define data-types of variables used in '''OMShell'''.

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||10:02
|| Now let me switch back to the slides.

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|| 10:06
|| '''Reduction functions''' take '''array''' as '''input''' and return '''scalar''' as '''output'''.

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|| 10:13
||'''min()''' is a '''function''' which returns the smallest value in an '''array'''.

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|| 10:19
||Similarly, '''max() function''' returns the largest value in an '''array'''. '''sum()''' returns the sum of all elements and '''product()''' returns the product of all elements.

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||10:33
|| Let me switch to '''OMShell''' to demonstrate these functions.

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|| 10:38
|| Let me create a new matrix.

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|| 10:41
||'''x (colon)(equals) (within square brackets) 3 (comma) 4 (semicolon) 5 (comma) 6'''.

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|| 10:52
|| Type '''min (x)''' to obtain the minimum value of '''x'''.

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|| 11:00
|| Type '''max (x)''' to obtain the largest value in array '''x'''..

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|| 11:08
|| Similarly type '''sum (x)''' to obtain the sum of all elements.

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|| 11:15
|| and '''product (x)''' to obtain the product of individual elements min array '''x'''.

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|| 11:23
|| Let me go back to the slides once again.

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|| 11:27
|| Let us now discuss various other '''functions''' that take an '''array''' as '''input'''.

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|| 11:33
||'''abs()''' is a '''function''' which returns an '''array''' with the '''absolute values''' of all its elements.

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|| 11:40
||'''size()''' returns a vector with the size of each dimension.

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|| 11:45
||'''ndims()''' returns the number of dimensions in an array.

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|| 11:51
|| This brings us to the end of this tutorial.

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|| 11:54
||In this tutorial, we used '''OMShell''' to interactively demonstrate '''array functions'''.

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|| 12:01
||These '''functions''' are part of '''Modelica''' language specification.

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|| 12:05
||Hence, they may be used while writing '''classes''' in '''OMEdit''' as well.

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|| 12:11
|| As an assignment, apply '''abs(), '''ndims()''' and '''size() functions''' to an '''array'''.

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|| 12:19
||Secondly, we have used a '''two-dimensional array''' or matrix as an '''argument''' to most of the '''functions'''.

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|| 12:28
||As an assignment, implement all these '''functions''' with '''three-dimensional arrays'''.

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|| 12:35
|| Watch the video available at the following link:[http://spoken-tutorial.org/ org] /What\_is\_a\_Spoken\_Tutorial

|-
|| 12:39
||Its summarises the '''Spoken Tutorial''' project.

|-
|| 12:42
|| We conducts workshops using spoken tutorials.Give certificates. Please contact us.

|-
|| 12:48
|| If you have questions in this spoken tutorial, please visit the webpage mentioned.

|-
|| 12:54
|| We coordinate coding of solved examples of popular books. Please contact us.

|-
|| 13:00
|| We help migrate commercial simulator labs to '''OpenModelica'''.

|-
|| 13:06
|| '''Spoken Tutorial Project''' is funded by '''NMEICT, MHRD''' Government of India.

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|| 13:14
|| We thank the development team of '''OpenModelica''' for their support. Thank you.

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 ||and the third argument '''2''', represents the size of second dimension.

OpenModelica/C2/Array-Functions-and-Operations/English-timed - Revision history

Sandhya.np14 at 10:16, 20 August 2018

Pratik kamble at 11:51, 3 April 2018

Jyotisolanki: Created page with "{| border=1 ||''' Time ''' ||'''Narration''' |- || 00:01 || Welcome to the Spoken Tutorial on '''Array Functions and Operations'''. |- || 00:07 || In this tutorial, we are g..."