Difference between revisions of "OpenModelica/C3/Modelica-Packages/English-timed"

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(Created page with "{| border=1 ||''' Time ''' ||'''Narration''' |- || 00:01 || Welcome to the Spoken Tutorial on '''Packages'''. |- ||00:05 || In this tutorial, we are going to learn: How to...")
 
 
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|| 00:01
 
|| 00:01
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|| Welcome to the Spoken Tutorial on '''Packages'''.
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|| Welcome to the '''Spoken Tutorial''' on '''Packages'''.
  
 
|-
 
|-
 
||00:05
 
||00:05
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|| In this tutorial, we are going to learn: How to create a '''package''' of '''classes''' in '''Modelica'''.
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|| In this tutorial, we are going to learn:
 +
how to create a '''package''' of '''classes''' in '''Modelica''',
  
 
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|-
 
||00:12
 
||00:12
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||How to reference '''classes''' in a '''package'''.
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||how to reference '''classes''' in a '''package''',
  
 
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||00:16
 
||00:16
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||How to import a '''package''' and How to use '''Modelica Library'''.
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||how to '''import''' a '''package''' and  
 +
how to use '''Modelica Library'''.
  
 
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|| 00:22
 
|| 00:22
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|| To record this tutorial, I am using :  '''OpenModelica 1.9.2''' and '''Ubuntu''' Operating System version '''14.04''' and '''gedit'''.
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|| To record this tutorial, I am using :  '''OpenModelica 1.9.2''' and '''Ubuntu Operating System''' version '''14.04''' and '''gedit'''.
  
 
|-
 
|-
 
||00:35
 
||00:35
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||'''Windows''' users may use '''Notepad''' or any other text editor instead of '''gedit'''.
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||'''Windows''' users may use '''Notepad''' or any other text-editor instead of '''gedit'''.
  
 
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||01:04
 
||01:04
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||It can be stored as a '''single file''' or a '''directory'''.
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||It can be stored as a single file or a '''directory'''.
  
 
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|| 01:12
 
|| 01:12
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|| In '''single file storage''' all '''classes''' belonging to a '''package''' are written in a '''single file'''.
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|| In '''single file storage''', all '''classes''' belonging to a '''package''' are written in a single file.
  
 
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|| 01:24
 
|| 01:24
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|| Now let me switch to '''OMEdit''' to demonstrate '''single file storage''' for a '''package'''.
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|| Now, let me switch to '''OMEdit''' to demonstrate '''single file storage''' for a '''package'''.
  
 
|-
 
|-
 
|| 01:31
 
|| 01:31
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|| Please download and save all the files available on our website.  
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|| Please download and '''save''' all the files available on our website.  
  
 
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||01:51
 
||01:51
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||'''Press Ctrl + O'''.  
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||Press '''Ctrl + O'''.  
  
 
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|-
 
||01:54
 
||01:54
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||Go to the appropriate location on your system and select  '''spokenTutorialExamples.mo''',  
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||Go to the appropriate location on your system and select  '''spokenTutorialExamples.mo''',
−
 
+
 
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||02:02
 
||02:02
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|| 02:32
 
|| 02:32
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|| Double click on '''spokenTutorialExamples''' icon.
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|| Double-click on '''spokenTutorialExamples''' icon.
  
 
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|| 02:42
 
|| 02:42
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|| Now let me discuss '''spokenTutorialExamples'''
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|| Now, let me discuss '''spokenTutorialExamples'''.
  
 
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||02:56
 
||02:56
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|| This package consists of '''freefall class''' '''bouncingBall''' model and '''bouncingBallWithUserTypes''' models.
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|| This package consists of '''freefall class''', '''bouncingBall''' model and '''bouncingBallWithUserTypes''' models.
  
 
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|| 03:08
 
|| 03:08
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|| '''end statement''' defines where the package ends.
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|| '''end''' statement defines where the package ends.
  
 
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|| 03:24
 
|| 03:24
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|| Click on the (+) button besides '''spokenTutorialExamples''' icon in '''Libraries Browser'''.  
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|| Click on the plus (+) button besides '''spokenTutorialExamples''' icon, in '''Libraries Browser'''.  
  
 
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|| 04:06
 
|| 04:06
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|| Now let me unload '''spokenTutorialExamples''' from OMEdit.  
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|| Now let me '''unload''' '''spokenTutorialExamples''' from OMEdit.  
  
 
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|| 04:27
 
|| 04:27
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|| In '''Directory storage classes''' are stored in separate files.
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|| In '''Directory storage''', classes are stored in separate files.
  
 
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|| 04:37
 
|| 04:37
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||A file named '''package.mo''' is to be included in the directory and  Each '''class''' starts with a '''within statement'''.  
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||A file named '''package.mo''' is to be included in the directory and  each '''class''' starts with a '''within''' statement.  
  
 
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|| 05:17
 
|| 05:17
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||Notice that the folder has following files:   '''package.mo''',  '''freeFall.mo''', '''bouncingBallWithUserTypes''' and  '''bouncingBall'''.
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||Notice that the folder has following files: '''package.mo''',  '''freeFall.mo''', '''bouncingBallWithUserTypes''' and  '''bouncingBall'''.
  
 
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|| 06:36
 
|| 06:36
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|| The difference between single file and directory storage can only be understood when we open this '''package''' using a text editor like '''gedit'''.  
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|| The difference between single file and '''directory storage''' can only be understood when we open this '''package''' using a text editor like '''gedit'''.  
  
 
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|| 06:53
 
|| 06:53
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|| Now let me unload '''spokenTutorialExamples''' package from 'OMEdit'''.
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|| Now, let me unload '''spokenTutorialExamples''' package from 'OMEdit'''.
  
 
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|| 07:17
 
|| 07:17
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|| '''within statement''' indicates that this file represents a '''package'''.
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|| '''within''' statement indicates that this file represents a '''package'''.
  
 
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||07:31
 
||07:31
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|| '''package.mo''' file can only contain the '''within statement''' and '''package''' declaration.
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|| '''package.mo''' file can only contain the '''within''' statement and '''package''' declaration.
  
 
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|| 07:41
 
|| 07:41
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|| This '''within statement''' indicates that '''freefall class''' belongs to '''spokenTutorialExamples''' package.  
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|| This '''within''' statement indicates that '''freefall''' class belongs to '''spokenTutorialExamples''' package.  
  
 
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|| 07:49
 
|| 07:49
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||Rest of this file has information specific to '''freeFall class'''.
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||Rest of this file has information specific to '''freeFall''' class.
  
 
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|| 08:04
 
|| 08:04
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||But, we didn’t observe '''within statement''' when we opened the package in '''OMEdit'''.  
+
||But, we didn’t observe '''within''' statement when we opened the package in '''OMEdit'''.  
  
 
|-
 
|-
 
|| 08:11
 
|| 08:11
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||This indicates that '''within statement''' helps '''OMEdit''' recognize the file structure.  
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||This indicates that '''within''' statement helps '''OMEdit''' recognize the file structure.  
  
 
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|| 08:33
 
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||'''OMEdit''' automatically loads it for every session.  
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||'''OMEdit''' automatically '''load'''s it for every session.  
  
 
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|| 08:46
 
|| 08:46
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||'''Classes''' of this library can be referenced and used.
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||'''Classes''' of this '''library''' can be referenced and used.
  
 
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|| 08:51
 
|| 08:51
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|| Now let me switch to '''OMEdit''' to demonstrate '''Modelica Library'''.
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|| Now, let me switch to '''OMEdit''' to demonstrate '''Modelica Library'''.
  
 
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|| 09:10
 
|| 09:10
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||You may note that a package may further contain packages as well as is evident here. Of special mention, is the '''SIunits''' package.  
+
||You may note that a package may further contain packages as well as is evident here. Of special mention is the '''SIunits''' package.  
  
 
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|| 09:32
 
|| 09:32
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||We shall see how to use these type definitions using '''bouncingBallWithImport class'''.  
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||We shall see how to use these '''type''' definitions using '''bouncingBallWithImport class'''.  
  
 
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|| 11:10
 
|| 11:10
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||Close the pop up window.
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||Close the pop-up window.
  
 
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|| 11:25
 
|| 11:25
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||let me de-select '''h'''. Delete the result. Switch to '''Modeling''' perspective.
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||Let me de-select '''h'''. Delete the result. Switch to '''Modeling''' perspective.
  
 
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|| 11:38
 
|| 11:38
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||This can be simplified using '''import statement'''.  
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||This can be simplified using '''import''' statement.  
  
 
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|| 11:42
 
|| 11:42
−
||Now, we shall type a few '''statements''' that show the use of '''import'''.  
+
||Now, we shall type a few statements that show the use of '''import'''.  
  
 
|-
 
|-
 
|| 11:48
 
|| 11:48
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||The '''statements''' to be typed are provided in a text file named '''import-statements.txt'''.  
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||The statements to be typed are provided in a text file named '''import-statements.txt'''.  
  
 
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|| 12:23
 
|| 12:23
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||Paste all the '''statements''' at the beginning of the model.  
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||Paste all the '''statement'''s at the beginning of the model.  
  
 
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|| 12:39
 
|| 12:39
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||Save this model by pressing '''Ctrl + S'''.
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||'''Save''' this model by pressing '''Ctrl + S'''.
  
 
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|| 12:52
 
|| 12:52
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||Close the pop up window.
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||Close the pop-up window.
  
 
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|| 13:15
 
|| 13:15
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||Using the '''import statements''', '''Modelica''' looks up for '''Length''' and '''Velocity''' type definitions using the path mentioned here.
+
||Using the '''import''' statements, '''Modelica''' looks up for '''Length''' and '''Velocity''' '''type definition'''s using the '''path''' mentioned here.
  
 
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|| 13:36
 
|| 13:36
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|| Now let us see how we can replace these two '''import statements''' by a single '''import statement'''.Delete the two '''statements'''.
+
|| Now let us see how we can replace these two '''import''' statements by a single '''import statement'''. Delete the two statements.
  
 
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||13:47
 
||13:47
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|| And type '''import (space) Modelica (dot) SIunits (dot) asterisk (semicolon)'''
+
|| And type: '''import space Modelica dot SIunits dot asterisk semicolon'''
  
 
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|| 13:58
 
|| 13:58
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||Save this model by pressing '''Ctrl + S'''  
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||'''Save''' this model by pressing '''Ctrl + S'''  
  
 
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|| 14:20
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||Close the pop up window.
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||Close the pop- up window.
  
 
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|| 14:25
 
|| 14:25
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||You may notice the similarity of plot once again.
+
||You may notice the similarity of '''plot''' once again.
  
 
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|| 14:38
 
|| 14:38
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||As an assignment,  Declare variable '''h''' and '''v''' of '''freeFall class''' as '''Length''' and '''Velocity''' types respectively.
+
||As an assignment,  declare variable '''h''' and '''v''' of '''freeFall class''' as '''Length''' and '''Velocity''' '''type'''s respectively.
  
 
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||14:58
 
||14:58
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|| Watch the video available at the link shown below: ][http://spoken-tutorial.org/ org] /What\_is\_a\_Spoken\_Tutorial
+
|| Watch the video available at the link shown below:
 +
http://spoken-tutorial.org/What_is_a_Spoken_Tutorial
  
 
|-
 
|-

Latest revision as of 17:10, 20 August 2018

Time Narration
00:01 Welcome to the Spoken Tutorial on Packages.
00:05 In this tutorial, we are going to learn:

how to create a package of classes in Modelica,

00:12 how to reference classes in a package,
00:16 how to import a package and

how to use Modelica Library.

00:22 To record this tutorial, I am using : OpenModelica 1.9.2 and Ubuntu Operating System version 14.04 and gedit.
00:35 Windows users may use Notepad or any other text-editor instead of gedit.
00:42 To understand and practice this tutorial, you need Knowledge of class and type definition in Modelica
00:51 Prerequisite tutorials are mentioned on our website. Please go through them.
00:56 A Package is a specialized class in Modelica.
01:01 It is a collection of classes.
01:04 It can be stored as a single file or a directory.
01:08 We will first learn about single file storage.
01:12 In single file storage, all classes belonging to a package are written in a single file.
01:20 It is not recommended as it may get lengthy in a few cases.
01:24 Now, let me switch to OMEdit to demonstrate single file storage for a package.
01:31 Please download and save all the files available on our website.
01:36 You may see that there is a file and a folder bearing the name spokenTutorialExamples.
01:43 Please download both of them.
01:46 Now, let me open the necessary files in OMEdit.
01:51 Press Ctrl + O.
01:54 Go to the appropriate location on your system and select spokenTutorialExamples.mo,
02:02 bouncingBallWithUserTypes.mo and bouncingBallWithImport.
02:08 You may also open each of them individually.
02:12 Note that I have not selected spokenTutorialExamples folder.
02:17 We shall discuss more about it when we look at directory storage.
02:23 Click on Open.
02:25 You may see that spokenTutorialExamples package is now seen in Libraries Browser.
02:32 Double-click on spokenTutorialExamples icon.
02:37 Switch to Text View if the file opens in Icon/Diagram View.
02:42 Now, let me discuss spokenTutorialExamples.
02:47 First line defines the name of a package.
02:51 Evidently, name of this package is spokenTutorialExamples.
02:56 This package consists of freefall class, bouncingBall model and bouncingBallWithUserTypes models.
03:08 end statement defines where the package ends.
03:13 We have viewed all classes and models of this package at one place.
03:19 Now, let us learn how to view individual classes in a package.
03:24 Click on the plus (+) button besides spokenTutorialExamples icon, in Libraries Browser.
03:31 This displays the names of classes present in this package.
03:36 Double-click on freeFall in Libraries Browser.
03:40 freeFall class has now opened.
03:43 Individual classes of a package may be simulated.
03:47 But the package itself can not be simulated.
03:52 Let me go back to spokenTutorialExamples tab.
03:57 Note that Simulate button doesn’t appear in the toolbar which indicates that this package cannot be simulated.
04:06 Now let me unload spokenTutorialExamples from OMEdit.
04:12 Do a right-click and select unload. Select Yes.
04:18 This is done so as to avoid conflict when demonstrating directory storage.
04:24 Now let me go back to the slides.
04:27 In Directory storage, classes are stored in separate files.
04:32 Name of directory is same as that of the package.
04:37 A file named package.mo is to be included in the directory and each class starts with a within statement.
04:47 Now, let me demonstrate the folder spokenTutorialExamples that you’ve downloaded.
04:54 Note that this folder represents the same package as that we have already discussed.
05:02 Let me demonstrate the file structure of this folder.
05:06 Go to the location where you saved the downloaded files on your system.
05:12 Double-click on spokenTutorialExamples folder.
05:17 Notice that the folder has following files: package.mo, freeFall.mo, bouncingBallWithUserTypes and bouncingBall.
05:30 We shall understand more about directory storage using both OMEdit and gedit.
05:38 Note that package.mo indicates that this folder represents a package.
05:45 Without this file, the folder doesn’t represent a Modelica package.
05:51 Now, let me switch to OMEdit to demonstrate directory storage.
05:57 Press Ctrl + O.
05:59 Navigate to the spokenTutorialExamples folder that you have downloaded.
06:05 Select package.mo from this folder and click on Open.
06:11 spokenTutorialExamples package can now be seen in Libraries Browser.
06:17 Double-click on spokenTutorialExamples icon.
06:22 Open the package in Text View if it opens in either Icon/Diagram View.
06:27 If you scroll down, you may notice that this package is the same as that we have seen in single file storage.
06:36 The difference between single file and directory storage can only be understood when we open this package using a text editor like gedit.
06:47 You may use Notepad or any other text editor if you are using Windows.
06:53 Now, let me unload spokenTutorialExamples package from 'OMEdit.
06:59 Switch to spokenTutorialExamples folder and open all the files using gedit.
07:08 Now all the files are open in gedit.
07:13 Let us take a look at package.mo first.
07:17 within statement indicates that this file represents a package.
07:21 Name of this package is spokenTutorialExamples.
07:25 Note that the name of folder was spokenTutorialExamples as well.
07:31 package.mo file can only contain the within statement and package declaration.
07:38 Let me switch to freeFall tab.
07:41 This within statement indicates that freefall class belongs to spokenTutorialExamples package.
07:49 Rest of this file has information specific to freeFall class.
07:54 You may see that other models in this package namely bouncingBallWithUserTypes and bouncingBall follow a similar syntax as well.
08:04 But, we didn’t observe within statement when we opened the package in OMEdit.
08:11 This indicates that within statement helps OMEdit recognize the file structure.
08:17 Hence, it is omitted by OMEdit while displaying the package.
08:22 Let me go back to the slides.
08:25 We shall now understand more about Modelica Library.
08:29 Modelica Library is an open-source package.
08:33 OMEdit automatically loads it for every session.
08:38 It can be seen in Libraries Browser.
08:41 It has classes from mechanical, electrical and thermal domains.
08:46 Classes of this library can be referenced and used.
08:51 Now, let me switch to OMEdit to demonstrate Modelica Library.
08:57 Locate Modelica icon in Libraries Browser and expand it.
09:03 Note that Modelica Library has packages named Blocks, Complex Blocks etc.
09:10 You may note that a package may further contain packages as well as is evident here. Of special mention is the SIunits package.
09:22 Expand it.
09:25 This package has type definitions for physical quantities like Angle, Length, Position etc.
09:32 We shall see how to use these type definitions using bouncingBallWithImport class.
09:39 Compress SIunits.
09:42 And double-click on bouncingBallWithImport and bouncingBallWithUserTypes.
09:49 Let me shift OMEdit window to the left for better visibility.
09:55 We shall first look at bouncingBallWithUserTypes.
09:59 We have learnt about this model in the prerequisite tutorials.
10:03 This model has type definitions named Length and Velocity.
10:09 We can instead use the type definition in SIunits instead of defining them explicitly in every model.
10:18 We shall see how to do that using bouncingBallWithImport model.
10:23 Let me switch to bouncingBallWithImport.
10:27 A class in a package is referenced to using dot.
10:32 Modelica.SIunits refers to SIunits package which belongs to Modelica library.
10:39 Variable h is declared to be of Length type which is defined in SIunits package.
10:47 Similarly, variable v is declared to be of Velocity type which is defined in SIunits package.
10:56 Note that parameters radius and g are declared in a similar fashion.
11:03 Now let me Simulate this model.
11:07 Click on Simulate button in the toolbar.
11:10 Close the pop-up window.
11:13 Select h in the Variables Browser.
11:17 Note that the plot obtained is similar to the one seen in the case ofbouncingBallWithUserTypes.
11:25 Let me de-select h. Delete the result. Switch to Modeling perspective.
11:33 It is tedious to use the full name of a class every time.
11:38 This can be simplified using import statement.
11:42 Now, we shall type a few statements that show the use of import.
11:48 The statements to be typed are provided in a text file named import-statements.txt.
11:56 Go to the location where you saved it on your system.
12:01 Double-click on import-statements.txt. Windows users may use Notepad to open this file.
12:11 The file is now open in gedit.
12:14 Copy all the statements using Ctrl+C or by doing right-click.
12:21 Switch to OMEdit.
12:23 Paste all the statements at the beginning of the model.
12:28 Delete the declaration statements for Length and Velocity, which have been defined before.
12:36 Delete the extra spaces.
12:39 Save this model by pressing Ctrl + S.
12:43 Now the model is complete and ready for simulation.
12:48 Click on Simulate button to simulate it.
12:52 Close the pop-up window.
12:54 Select h in the Variables Browser.
12:58 Note that the plot is same as in previous case.
13:03 De-select h and delete the result.
13:07 Switch to Modeling perspective.
13:10 Now let us now try to understand the import statements.
13:15 Using the import statements, Modelica looks up for Length and Velocity type definitions using the path mentioned here.
13:25 This saves the trouble of referring to the package every time.
13:30 A detailed discussion of lookup rules is beyond the scope of this tutorial.
13:36 Now let us see how we can replace these two import statements by a single import statement. Delete the two statements.
13:47 And type: import space Modelica dot SIunits dot asterisk semicolon
13:58 Save this model by pressing Ctrl + S
14:02 This statement is known as a wild-card import.
14:06 This way, any class from SIunits may be accessed without explicitly mentioning it.
14:14 Now let me Simulate this model.
14:17 Click on Simulate button.
14:20 Close the pop- up window.
14:22 Select h in the Variables Browser.
14:25 You may notice the similarity of plot once again.
14:29 De-select h and delete the result.
14:32 Go back to Modeling perspective.
14:35 Now let me switch to the slides.
14:38 As an assignment, declare variable h and v of freeFall class as Length and Velocity types respectively.
14:47 These type definitions can be found in SIunits package of Modelica library.
14:54 This brings us to the end of this tutorial.
14:58 Watch the video available at the link shown below:

http://spoken-tutorial.org/What_is_a_Spoken_Tutorial

15:02 It summarises the Spoken Tutorial project.
15:05 If you have questions in this Spoken Tutorial, please visit the website shown.
15:11 We coordinate coding of solved examples from popular books.
15:15 We give honorarium to contributors. Please visit our website.
15:21 We help migrate labs from commercial simulators to OpenModelica.
15:26 Please visit the following website.
15:29 Spoken Tutorial Project is supported by NMEICT, MHRD Government of India.
15:36 We thank the development team of OpenModelica for their support.
15:41 I would like to thank you for joining me in this tutorial.

Good bye.

Contributors and Content Editors

Jyotisolanki, Sandhya.np14

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