Difference between revisions of "Scilab/C2/Iteration/English-timed"

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{| border=1
 
{| border=1
 
|| ''Time'''
 
|| ''Time'''
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| | Welcome to the spoken tutorial on iterative calculations using Scilab.
 
| | Welcome to the spoken tutorial on iterative calculations using Scilab.
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| 00.18
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| | I will use the code available in the file iteration.sce
 
| | I will use the code available in the file iteration.sce
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|-
  
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|00.23
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|00.22
  
 
|| I have opened this file using Scilab editor, which I plan to use only as an editor.
 
|| I have opened this file using Scilab editor, which I plan to use only as an editor.
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|00.42
 
|00.42
  
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| | In this command i is equal to 1 colon 2 colon 5,
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| | In this command,  i is equal to 1 colon 2 colon 5,
  
 
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|-
  
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| 00.52
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| 00.51
  
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| | we see that the middle argument of 2 indicates the increment.
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| | We see that the middle argument of 2 indicates the increment.
  
 
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|-
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|-
  
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|01.10
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|01.09
  
 
| | It is not difficult to explain this behaviour.
 
| | It is not difficult to explain this behaviour.
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|01.13
 
|01.13
  
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| | Can you think for a moment why this happens?
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| Can you think for a moment why this happens?
  
 
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|-
  
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| 01.16
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| 01.15
  
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|| We will now demonstrate the use of the for statement to perform iterative calculations.
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|We will now demonstrate the use of the for statement to perform iterative calculations.
  
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for i is equal to 1 colon 2 colon 7 disp i end of for loop.
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| 01.22
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|for i is equal to 1 colon 2 colon 7 disp i end of for loop.
  
 
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| |I will cut this paste in scilab console press enter.
 
| |I will cut this paste in scilab console press enter.
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| |This code prints out i, as we go through the loop.
 
| |This code prints out i, as we go through the loop.
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| |The number of times the iterations take place is known as priori in for loops.
 
| |The number of times the iterations take place is known as priori in for loops.
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| | In the rest of this tutorial, we will stick to the default increment of 1.
 
| | In the rest of this tutorial, we will stick to the default increment of 1.
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|02.18
  
 
| Note that i is displayed only up to 2.
 
| Note that i is displayed only up to 2.
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|02.22
 
|02.22
  
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| | The iteration is not carried out till the last value of i, namely, 5.
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| | The iteration is not carried out till the last value of i, namely 5.
  
 
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|-
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| 02.30
  
 
| | The break command, however, terminates the loop.
 
| | The break command, however, terminates the loop.
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| 02.40
  
 
| | Note that "i is equal to 2" statement uses the "equal to" sign twice.
 
| | Note that "i is equal to 2" statement uses the "equal to" sign twice.
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| | This is the standard way to compare the equality in programming languages.
 
| | This is the standard way to compare the equality in programming languages.
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| | The result of this comparison statement is a boolean: true or false.
 
| | The result of this comparison statement is a boolean: true or false.
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| | For i less than or equal to 3, as given by the i less than or equal to 3 statement, nothing happens.
 
| | For i less than or equal to 3, as given by the i less than or equal to 3 statement, nothing happens.
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| | We take a small break and show how to get help for operators of the type less than or equal to.
 
| | We take a small break and show how to get help for operators of the type less than or equal to.
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|| This opens the scilab help browser.
 
|| This opens the scilab help browser.
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| 03.51
  
 
|| We see that the help is available under the option less.
 
|| We see that the help is available under the option less.
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|04.06
  
 
|| We see the required help instructions here. I will close this.
 
|| We see the required help instructions here. I will close this.
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|04.11
  
 
| | The for statement in Scilab is more powerful than in programming languages.
 
| | The for statement in Scilab is more powerful than in programming languages.
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| 04.24
  
 
| | This script displays all values of v.
 
| | This script displays all values of v.
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|04.44
  
 
| | We have spent quite a bit of time explaining the for loop.
 
| | We have spent quite a bit of time explaining the for loop.
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| | The while statement allows us to perform a loop when a boolean expression is true
 
| | The while statement allows us to perform a loop when a boolean expression is true
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| | At the beginning of the loop, if the expression is true,
 
| | At the beginning of the loop, if the expression is true,
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| |the statements in the body of the while loop are executed.
 
| |the statements in the body of the while loop are executed.
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|| You can also try the example for continue statement in while loop.
 
|| You can also try the example for continue statement in while loop.
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|| Spoken Tutorials are part of the Talk to a Teacher project, supported by the National Mission on Education through ICT.
 
|| Spoken Tutorials are part of the Talk to a Teacher project, supported by the National Mission on Education through ICT.
  
 
|-
 
|-
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| 05.57
 
| 05.57
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| | More information on the same is available at the following link [http://spoken-tutorial.org/NMEICT-Intro].
 
| | More information on the same is available at the following link [http://spoken-tutorial.org/NMEICT-Intro].
  
 
|-
 
|-
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| 06.00
 
| 06.00
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| |Thanks for joining.Good bye.
 
| |Thanks for joining.Good bye.
  
 
|}
 
|}

Revision as of 17:01, 6 March 2014

Time' Narration


00.01 Welcome to the spoken tutorial on iterative calculations using Scilab.
00.07 I am using scilab version 5.2 in Mac operating system ,
00.11 but these calculations should work in other versions and also in Scilab that runs in linux and windows.
00.17 I will use the code available in the file iteration.sce
00.22 I have opened this file using Scilab editor, which I plan to use only as an editor.
00.29 Let us create a vector using the colon operator i is equal to 1 colon 5.
00.38 creates a vector from 1 to 5, in increments of 1.
00.42 In this command, i is equal to 1 colon 2 colon 5,
00.51 We see that the middle argument of 2 indicates the increment.
00.56 1 is the first argument where the vector starts. I cannot go beyond 5.
01.01 It can be equal to 5, however.
01.04 Note that if the ending argument changes to 6 the result remains the same.
01.09 It is not difficult to explain this behaviour.
01.13 Can you think for a moment why this happens?
01.15 We will now demonstrate the use of the for statement to perform iterative calculations.
01.22 for i is equal to 1 colon 2 colon 7 disp i end of for loop.
01.28 I will cut this paste in scilab console press enter.
01.34 This code prints out i, as we go through the loop.
01.37 The display is due to the command disp - the passed argument is displayed.
01.42 Recall that the for loop is used for integer values.
01.45 In this case, four integer values, namely, 1, 3, 5 and 7 are displayed.
01.50 The number of times the iterations take place is known as priori in for loops.
01.56 In the rest of this tutorial, we will stick to the default increment of 1.
02.01 Let us begin with the loop that displays i equal to 1 to 5.
02.10 We will modify this code by introducing the break statement.
02.18 Note that i is displayed only up to 2.
02.22 The iteration is not carried out till the last value of i, namely 5.
02.27 When i is equal to 2, the if block is executed for the first time.
02.30 The break command, however, terminates the loop.
02.34 If we want to get out of a loop when some intermediate condition is satisfied, we can use the break statement.
02.40 Note that "i is equal to 2" statement uses the "equal to" sign twice.
02.45 This is the standard way to compare the equality in programming languages.
02.50 The result of this comparison statement is a boolean: true or false.
02.56 We will introduce the continue statement here paste press enter
03.06 This results in i getting displayed only for 4 and 5.
03.10 For i less than or equal to 3, as given by the i less than or equal to 3 statement, nothing happens.
03.18 The continue statement makes the program skip the rest of the loop.
03.22 Unlike the break statement, however, it does not exit the loop.
03.25 The parameter i is incremented and all the calculations of the loop are executed for the new i.
03.32 We take a small break and show how to get help for operators of the type less than or equal to.
03.38 Let us type less than or equal to with help
03.46 This opens the scilab help browser.
03.51 We see that the help is available under the option less.
03.56 So now after closing this we type help less
04.06 We see the required help instructions here. I will close this.
04.11 The for statement in Scilab is more powerful than in programming languages.
04.16 For example, let us perform a loop over a vector:
04.24 This script displays all values of v.
04.28 Until now we have been displaying only the variables.
04.32 We can indeed display the result of a calculation as well.
04.35 The following code displays the square of the numbers.
04.44 We have spent quite a bit of time explaining the for loop.
04.48 Let us now move on to the while loops.
04.50 The while statement allows us to perform a loop when a boolean expression is true
04.55 At the beginning of the loop, if the expression is true,
04.58 the statements in the body of the while loop are executed.
05.02 If the program is written well, the expression becomes false and the loop is ended.
05.08 Now let us see an example for the while loop:
05.15 The values of i, from 1 to 6 are displayed.
05.19 Break and continue statements inside the while loop work exactly as they did in the for loop, as we demonstrate using break:
05.33 We can see that the moment i becomes equal to 3, the program exits the loop, thanks to the break statement.
05.39 You can also try the example for continue statement in while loop.
05.44 This brings us to the end of this spoken tutorial on iterative calculations using Scilab.
05.50 Spoken Tutorials are part of the Talk to a Teacher project, supported by the National Mission on Education through ICT.
05.57 More information on the same is available at the following link [1].
06.00 Thanks for joining.Good bye.

Contributors and Content Editors

Gaurav, PoojaMoolya, Sandhya.np14, Sneha

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