Difference between revisions of "OpenModelica/C2/Arrays-in-Modelica/English-timed"

From Script | Spoken-Tutorial
Jump to: navigation, search
(Created page with "{| border=1 ||''' Time ''' ||'''Narration''' |- || 00:01 || Welcome to the spoken tutorial on '''Arrays'''. |- || 00:05 || In this tutorial, we are going to learn: How to d...")
 
Line 5: Line 5:
 
|-
 
|-
 
|| 00:01
 
|| 00:01
−
|| Welcome to the spoken tutorial on '''Arrays'''.
+
|| Welcome to the '''spoken tutorial''' on '''Arrays'''.
  
 
|-
 
|-
 
|| 00:05
 
|| 00:05
−
|| In this tutorial, we are going to learn:  How to declare '''array''' variables, How to construct '''arrays''', How to use '''for''' and '''while''' loops and How to use '''OMShell'''.
+
|| In this tutorial, we are going to learn:   
 +
how to declare '''array''' variables,  
 +
how to construct '''arrays''',  
 +
how to use '''for''' and '''while''' loops and  
 +
how to use '''OMShell'''.
  
 
|-
 
|-
Line 17: Line 21:
 
|-
 
|-
 
|| 00:26
 
|| 00:26
−
||You may use any of the following operating systems to practice this tutorial.
+
||You may use any of the following '''operating system'''s to practice this tutorial.
  
 
|-
 
|-
 
||00:32
 
||00:32
−
|| To understand and practice this tutorial:You need knowledge of '''arrays''' in any programming language.
+
|| To understand and practice this tutorial, you need knowledge of '''arrays''' in any programming language.
 
   
 
   
 
|-
 
|-
Line 33: Line 37:
 
|-
 
|-
 
|| 00:53
 
|| 00:53
−
||It has single index.
+
||It has single '''index'''.
  
 
|-
 
|-
Line 45: Line 49:
 
|-
 
|-
 
|| 01:05
 
|| 01:05
−
||A '''vector''' can be constructed by including the elements in curly braces.
+
||A '''vector''' can be constructed by including the '''element'''s in curly braces.
  
 
|-
 
|-
Line 53: Line 57:
 
|-
 
|-
 
|| 01:19
 
|| 01:19
−
|| To access the elements of a '''vector''', it is necessary to understand '''indexing'''.
+
|| To access the '''element'''s of a '''vector''', it is necessary to understand '''indexing'''.
  
 
|-
 
|-
Line 61: Line 65:
 
|-
 
|-
 
|| 01:29
 
|| 01:29
−
||'''Vector indexing''' starts from '''1''' and '''Indices''' must be '''integers'''.  
+
||'''Vector indexing''' starts from '''1''' and indices must be integers.  
  
 
|-
 
|-
Line 73: Line 77:
 
|-
 
|-
 
|| 01:49
 
|| 01:49
−
||We shall replace parameters '''a,b''' and '''c''' of '''polynomialEvaluator''' with a vector '''a'''.
+
||We shall replace parameters '''a, b''' and '''c''' of '''polynomialEvaluator''' with a vector '''a'''.
  
 
|-
 
|-
 
|| 01:58
 
|| 01:58
−
|| Please download and save all the files available on our '''Code Files''' link.  
+
|| Please download and '''save''' all the files available on our '''Code Files''' link.  
  
 
|-
 
|-
Line 102: Line 106:
 
|-
 
|-
 
||02:42
 
||02:42
−
|| Now, to view them let me double click on each icon.  
+
|| Now, to view them, let me double click on each '''icon'''.  
  
 
|-
 
|-
Line 130: Line 134:
 
|-
 
|-
 
|| 03:23
 
|| 03:23
−
|| Parameters '''a,b''' and '''c''' of '''polynomialEvaluator''' are replaced with a vector '''a'''.
+
|| Parameters '''a, b''' and '''c''' of '''polynomialEvaluator''' are replaced with a vector '''a'''.
  
 
|-
 
|-
Line 142: Line 146:
 
|-
 
|-
 
|| 03:42
 
|| 03:42
−
||The elements are separated by a '''comma'''.
+
||The elements are separated by a comma.
  
 
|-
 
|-
 
|| 03:46
 
|| 03:46
−
|| In the '''assignment''' statement the elements of vector '''a''' are accessed using their indices.
+
|| In the '''assignment''' statement, the elements of vector '''a''' are accessed using their indices.
  
 
|-
 
|-
Line 166: Line 170:
 
|-
 
|-
 
|| 04:16
 
|| 04:16
−
||This class is similar to the '''functionTester''' class discussed in previous tutorial.
+
||This '''class''' is similar to the '''functionTester''' class discussed in previous tutorial.
  
 
|-
 
|-
 
|| 04:24
 
|| 04:24
−
|| '''z''' is a Real variable.
+
|| '''z''' is a '''Real''' variable.
  
 
|-
 
|-
Line 182: Line 186:
 
|-
 
|-
 
|| 04:40
 
|| 04:40
−
||Now let me Simulate this class.
+
||Now, let me '''Simulate''' this class.
  
 
|-
 
|-
Line 194: Line 198:
 
|-
 
|-
 
|04:49
 
|04:49
−
|| Select '''z''' in the '''variables''' browser.
+
|| Select '''z''' in the '''variables browser'''.
  
 
|-
 
|-
Line 202: Line 206:
 
|-
 
|-
 
|| 05:00
 
|| 05:00
−
||This plot is the same as observed in the case of '''polynomialEvaluator''' function.
+
||This '''plot''' is the same as observed in the case of '''polynomialEvaluator''' function.
  
 
|-
 
|-
 
|| 05:07
 
|| 05:07
−
||Now let me de-select '''z''' and delete the result.
+
||Now, let me de-select '''z''' and delete the result.
  
 
|-
 
|-
Line 230: Line 234:
 
|-
 
|-
 
|| 05:34
 
|| 05:34
−
|| To demonstrate how to use '''for''' loop let me go back to '''OMEdit'''.
+
|| To demonstrate how to use '''for''' loop, let me go back to '''OMEdit'''.
  
 
|-
 
|-
Line 250: Line 254:
 
|-
 
|-
 
|| 06:01
 
|| 06:01
−
|| Firstly, '''Comment''' the assignment statement for '''fx''' by inserting double slash at the beginning and end.
+
|| Firstly, '''comment''' the assignment statement for '''fx''' by inserting double slash at the beginning and end.
  
 
|-
 
|-
Line 266: Line 270:
 
|-
 
|-
 
||  06:29
 
||  06:29
−
||Windows users may use '''notepad''' or any other text editor to open it.
+
||'''Windows''' users may use '''notepad''' or any other text editor to open it.
  
 
|-
 
|-
Line 286: Line 290:
 
|-
 
|-
 
||  06:53
 
||  06:53
−
||Save this function by pressing '''Ctrl + S'''.
+
||'''Save''' this function by pressing '''Ctrl + S'''.
  
 
|-
 
|-
Line 294: Line 298:
 
|-
 
|-
 
||  07:02
 
||  07:02
−
||This statement assigns '''fx '''an initial value of zero before the loop starts.
+
||This statement assigns '''fx '''an initial value of zero, before the loop starts.
  
 
|-
 
|-
Line 302: Line 306:
 
|-
 
|-
 
|| 07:12
 
|| 07:12
−
||The loop runs until value of '''i''' is '''3'''.  
+
||The loop '''run'''s until value of '''i''' is '''3'''.  
  
 
|-
 
|-
Line 330: Line 334:
 
|-
 
|-
 
|| 07:44
 
|| 07:44
−
||To test this function let us use the class '''functionTester'''.
+
||To test this function, let us use the class '''functionTester'''.
  
 
|-
 
|-
 
|| 07:49
 
|| 07:49
−
||I have made no changes to this function to this '''class'''.
+
||I have made no changes to this function, to this '''class'''.
  
 
|-
 
|-
 
|| 07:54
 
|| 07:54
−
|| let me simulate this class by pressing '''Simulate''' button in the toolbar.
+
|| Let me simulate this class by pressing '''Simulate''' button in the toolbar.
  
 
|-
 
|-
Line 346: Line 350:
 
|-
 
|-
 
|| 08:03
 
|| 08:03
−
||Note that the value of '''z''' remains the same after changes are made to the function.
+
||Note that the value of '''z''' remains the same after changes are made to the '''function'''.
  
 
|-
 
|-
Line 358: Line 362:
 
|-
 
|-
 
|| 08:17
 
|| 08:17
−
|| Now let me go back to the slides once again.
+
|| Now let me go back to the '''slide'''s once again.
  
 
|-
 
|-
Line 390: Line 394:
 
|-
 
|-
 
|| 08:55
 
|| 08:55
−
|| To understated more about '''array''' construction and '''indexing'''.
+
|| To understand more about '''array''' construction and '''indexing'''-
  
 
|-
 
|-
Line 450: Line 454:
 
|-
 
|-
 
|| 10:11
 
|| 10:11
−
||Hence, the size of second dimension of myMatrix is '''2'''.
+
||Hence, the size of second dimension of '''myMatrix''' is '''2'''.
  
 
|-
 
|-
Line 462: Line 466:
 
|-
 
|-
 
|| 10:29
 
|| 10:29
−
|| To add this two arrays or matrices we need to access elements from two dimensions.  
+
|| To add these two arrays or matrices, we need to access elements from two dimensions.  
  
 
|-
 
|-
 
|| 10:35
 
|| 10:35
−
||Hence '''a''' '''nested for''' loop is required.
+
||Hence a '''nested for''' loop is required.
  
 
|-
 
|-
Line 474: Line 478:
 
|-
 
|-
 
|| 10:44
 
|| 10:44
−
|| Similarly this '''for''' loop runs through the second dimension.
+
|| Similarly, this '''for''' loop runs through the second dimension.
  
 
|-
 
|-
Line 486: Line 490:
 
|-
 
|-
 
|| 11:00
 
|| 11:00
−
|| This statements represent the end of each '''for''' loop. The class is now complete.
+
|| These statements represent the end of each '''for''' loop. The '''class''' is now complete.
  
 
|-
 
|-
Line 502: Line 506:
 
|-
 
|-
 
|| 11:18
 
|| 11:18
−
||Select '''adder[1,1]''', '''myMatrix[1,1]''', and '''mySum[1,1]'''.
+
||Select '''adder[1,1]''', '''myMatrix[1,1]'''  and '''mySum[1,1]'''.
  
 
|-
 
|-
Line 522: Line 526:
 
|-
 
|-
 
|| 11:51
 
|| 11:51
−
||Similarly write a function '''matrixReversal''' to reverse the order of elements in each row of a matrix.
+
||Similarly, write a function '''matrixReversal''' to reverse the order of elements in each row of a matrix.
  
 
|-
 
|-
Line 534: Line 538:
 
|-
 
|-
 
|| 12:09
 
|| 12:09
−
|| Please watch the video available at following link: [http://spoken-tutorial.org/ org] /What\_is\_a\_Spoken\_Tutorial''' It summarises the '''Spoken Tutorial''' project.
+
|| Please watch the video available at following link:  
 +
http://spoken-tutorial.org/What_is_a_Spoken_Tutorial''' It summarizes the '''Spoken Tutorial''' project.
  
 
|-
 
|-
 
|| 12:15
 
|| 12:15
−
|| We conducts workshops using spoken tutorials.Give certificates. Please contact us.
+
|| We conduct workshops using spoken tutorials, give certificates. Please contact us.
  
 
|-
 
|-
Line 558: Line 563:
 
|-
 
|-
 
|| 12:48
 
|| 12:48
−
|| Spoken Tutorial Project is funded by '''NMEICT, MHRD''', Government of India.
+
|| Spoken Tutorial project is funded by '''NMEICT, MHRD''', Government of India.
  
 
|-
 
|-

Revision as of 14:31, 20 August 2018

Time Narration
00:01 Welcome to the spoken tutorial on Arrays.
00:05 In this tutorial, we are going to learn:

how to declare array variables, how to construct arrays, how to use for and while loops and how to use OMShell.

00:20 To record this tutorial, I am using: OpenModelica 1.9.2
00:26 You may use any of the following operating systems to practice this tutorial.
00:32 To understand and practice this tutorial, you need knowledge of arrays in any programming language.
00:40 You need to know how to define a class in Modelica. Prerequisite tutorials are mentioned on our website. Please go through them.
00:50 Vector is a one dimensional array.
00:53 It has single index.
00:55 Syntax for vector declaration is as shown.
00:50 The example shown declares a vector variable a whose size is 2.
01:05 A vector can be constructed by including the elements in curly braces.
01:11 This example defines a vector parameter a with 2 and 3 as its elements.
01:19 To access the elements of a vector, it is necessary to understand indexing.
01:25 Syntax for vector indexing is as shown.
01:29 Vector indexing starts from 1 and indices must be integers.
01:35 Let us develop a function named polynomialEvaluatorUsingVectors.
01:41 This function is an extension of polynomialEvaluator function which was discussed in previous tutorials.
01:49 We shall replace parameters a, b and c of polynomialEvaluator with a vector a.
01:58 Please download and save all the files available on our Code Files link.
02:05 For your convenience, polynomialEvaluator function is also made available.
02:12 Now let me switch to OMEdit to demonstrate this function.
02:17 OMEdit is now open in Welcome perspective.
02:21 I have opened all the necessary files.
02:25 Note that the following classes or functions are now open in OMEdit: functionTester,

matrixAdder, polynomialEvaluator and polynomialEvaluatorUsingVectors.

02:42 Now, to view them, let me double click on each icon.
02:49 Let me shift the OMEdit window to the left for better visibility.
02:56 Go to polynomialEvaluator tab.
03:00 Open it in Text View.
03:03 For more information on this function, refer to the previous tutorials.
03:09 Let me go to polynomialEvaluatorUsingVectors. Open it in Text View.
03:16 Input and output variables are the same as in polynomialEvaluator function.
03:23 Parameters a, b and c of polynomialEvaluator are replaced with a vector a.
03:32 Size of this vector is 3.
03:36 The elements of this vector are included in curly braces as shown.
03:42 The elements are separated by a comma.
03:46 In the assignment statement, the elements of vector a are accessed using their indices.
03:54 a[1] is the first element of vector a.
03:59 Similarly, the second element and third element of vector a have been accessed as well.
04:08 Now, let me switch to functionTester tab.
04:13 Open it in Text View.
04:16 This class is similar to the functionTester class discussed in previous tutorial.
04:24 z is a Real variable.
04:27 polynomialEvaluatorUsingVectors function is called with an input argument of 10 units.
04:35 The value returned by this function is equated to z.
04:40 Now, let me Simulate this class.
04:43 Click on Simulate button.
04:46 Close the pop up window.
04:49 Select z in the variables browser.
04:53 Note that the value of z is equal to f(x) at x = 10.
05:00 This plot is the same as observed in the case of polynomialEvaluator function.
05:07 Now, let me de-select z and delete the result.
05:13 Go back to Modeling perspective
05:16 Now let me switch to the slides.
05:19 for loop is used to iterate statements a given number of times.
05:24 It can be used in algorithm and equation sections.
05:29 Syntax for for loop is as shown with an example.
05:34 To demonstrate how to use for loop, let me go back to OMEdit.
05:40 Click on polynomialEvaluatorUsingVectors tab.
05:45 In the assignment statement for fx, we are accessing the elements of vector a.
05:52 This can also be done using a for loop.
05:55 Now, let us see how to include a for loop in the algorithm section.
06:01 Firstly, comment the assignment statement for fx by inserting double slash at the beginning and end.
06:10 Save this function by pressing Ctrl+S.
06:15 The for loop to be inserted has been provided in a text file named for-loop.txt.
06:23 It is available on our website. I have opened this file using gedit.
06:29 Windows users may use notepad or any other text editor to open it.
06:35 Let me go to gedit.
06:38 Copy all the statements by pressing Ctrl+C.
06:44 Go back to OMEdit
06:46 Press Enter. Paste all the statements by pressing Ctrl + V.
06:53 Save this function by pressing Ctrl + S.
06:57 Now, let me explain each statement of this loop.
07:02 This statement assigns fx an initial value of zero, before the loop starts.
07:09 Here, i serves as a loop counter.
07:12 The loop runs until value of i is 3.
07:16 It is not necessary to declare i before it is used.
07:21 Let me scroll down a bit.
07:24 This statement iteratively adds terms of the polynomial f(x).
07:30 Polynomial f(x) has been discussed while discussing polynomialEvaluator function.
07:37 This statement indicates the end of for loop.
07:41 Now, this function is complete.
07:44 To test this function, let us use the class functionTester.
07:49 I have made no changes to this function, to this class.
07:54 Let me simulate this class by pressing Simulate button in the toolbar.
07:49 Select z in variables browser.
08:03 Note that the value of z remains the same after changes are made to the function.
08:10 Let me de-select z and delete the result.
08:14 Go back to Modeling perspective
08:17 Now let me go back to the slides once again.
08:21 while loop is used to iterate statements until a given condition is satisfied.
08:27 while loop cannot be used in equation section.
08:31 for loop is more frequently used in Modelica as compared to while.
08:37 Let us discuss Arrays now.
08:40 Arrays are used to represent multi-dimensional data.
08:44 They can be constructed using vector notation.
08:48 Syntax for array declaration and indexing is as shown.
08:55 To understand more about array construction and indexing-
09:00 Let us write a class named matrixAdder which adds myMatrix and adder matrices to give mySum. myMatrix and adder matrices are as shown.
09:14 Now, let me switch to OMEdit to demonstrate matrixAdder class.
09:19 It is already open in OMEdit.
09:23 Click on matrixAdder tab.
09:26 Open it in Text view.
09:29 myMatrix is a Real parameter array.
09:33 Numbers in square bracket represent size of this array.
09:39 The size of first dimension is 3.
09:42 Similarly, the size of second dimension is 2.
09:46 myMatrix array is constructed using three vectors of two elements each.
09:53 {1,2} represents the first vector.
09:57 {3,4} is the second one and
10:00 {5,6}} represents the third vector.
10:04 Size of each of this vectors is equal to size of second dimension of this array.
10:11 Hence, the size of second dimension of myMatrix is 2.
10:16 The number of vectors is equal to the size of first dimension. Hence, the size of first dimension is equal to 3.
10:25 adder matrix is constructed in a similar fashion.
10:29 To add these two arrays or matrices, we need to access elements from two dimensions.
10:35 Hence a nested for loop is required.
10:40 This for loop runs through the first dimension.
10:44 Similarly, this for loop runs through the second dimension.
10:49 Let me scroll down a bit.
10:52 Corresponding elements of myMatrix and adder matrices are added to yield mySum
11:00 These statements represent the end of each for loop. The class is now complete.
11:07 Let me simulate it by clicking on Simulate button.
11:11 Close the pop up window if it appears.
11:15 Let me expand variables column.
11:18 Select adder[1,1], myMatrix[1,1] and mySum[1,1].
11:25 Note that adder[1,1] plus myMatrix[1,1] gives mySum[1,1] which means that the result is accurate.
11:35 Let me de-select them and delete the result.
11:40 Let me go back to the slides.
11:43 As an assignment: Write a function named vectorReversal to reverse the order of elements in a vector.
11:51 Similarly, write a function matrixReversal to reverse the order of elements in each row of a matrix.
12:00 Write functionTester class to test these two functions.
12:05 This brings us to the end of this tutorial.
12:09 Please watch the video available at following link:

http://spoken-tutorial.org/What_is_a_Spoken_Tutorial It summarizes the Spoken Tutorial project.

12:15 We conduct workshops using spoken tutorials, give certificates. Please contact us.
12:21 If you have questions related to this spoken tutorial, please visit the following website.
12:28 We coordinate coding of solved examples of popular books.
12:33 We give honorarium and certificates to those who do this. Please visit the following website.
12:39 We help migrate commercial simulator labs to OpenModelica. Please visit the following website for more information.
12:48 Spoken Tutorial project is funded by NMEICT, MHRD, Government of India.
12:55 We thank the development team of OpenModelica for their support.
13:00 Thank you for joining me in this tutorial.

Contributors and Content Editors

Jyotisolanki, Sandhya.np14

Retrieved from "https://script.spoken-tutorial.org/index.php?title=OpenModelica/C2/Arrays-in-Modelica/English-timed&oldid=44087"