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

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{| border=1
 
{| border=1
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|| ''Time'''
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|| '''Time'''
 
|| '''Narration'''
 
|| '''Narration'''
−
 
  
 
|-
 
|-
  
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|00.01
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|00:01
  
 
| | Welcome to the spoken tutorial on iterative calculations using Scilab.
 
| | Welcome to the spoken tutorial on iterative calculations using Scilab.
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|-
 
|-
  
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| 00.07
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| 00:07
  
 
| | I am using scilab version 5.2 in Mac operating system ,
 
| | I am using scilab version 5.2 in Mac operating system ,
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|-
 
|-
  
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| 00.11
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| 00:11
  
 
| | but these calculations should work in other versions and also in Scilab that runs in linux and windows.
 
| | but these calculations should work in other versions and also in Scilab that runs in linux and windows.
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|-
 
|-
  
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| 00.17
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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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|00.22
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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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|-
 
|-
  
−
| 00.29
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| 00:29
  
 
|| Let us create a vector using the colon operator i is equal to 1 colon 5.
 
|| Let us create a vector using the colon operator i is equal to 1 colon 5.
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|-
 
|-
  
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| 00.38
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| |creates a vector from 1 to 5, in increments of 1.
 
| |creates a vector from 1 to 5, in increments of 1.
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|-
 
|-
  
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|00.42
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|00:42
  
 
| | In this command,  i is equal to 1 colon 2 colon 5,
 
| | In this command,  i is equal to 1 colon 2 colon 5,
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|-
 
|-
  
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| 00.51
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| 00:51
  
 
| | We see that the middle argument of 2 indicates the increment.
 
| | We see that the middle argument of 2 indicates the increment.
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|-
 
|-
  
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| 00.56
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| 00:56
  
 
| | 1 is the first argument where the vector starts. I cannot go beyond 5.
 
| | 1 is the first argument where the vector starts. I cannot go beyond 5.
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|-
 
|-
  
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| 01.01
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| 01:01
  
 
| |It can be equal to 5, however.
 
| |It can be equal to 5, however.
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|-
 
|-
  
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| 01.04
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| 01:04
  
 
| | Note that if the ending argument changes to 6 the result remains the same.
 
| | Note that if the ending argument changes to 6 the result remains the same.
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|-
 
|-
  
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|01.09
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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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|-
 
|-
  
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|01.13
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|01:13
  
 
|  Can you think for a moment why this happens?
 
|  Can you think for a moment why this happens?
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|-
 
|-
  
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| 01.15
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| 01:15
  
 
|We will now demonstrate the use of the for statement to perform iterative calculations.
 
|We will now demonstrate the use of the for statement to perform iterative calculations.
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|-
 
|-
  
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| 01.22
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| 01:22
  
 
|for i is equal to 1 colon 2 colon 7 disp i end of for loop.
 
|for i is equal to 1 colon 2 colon 7 disp i end of for loop.
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|-
 
|-
  
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| 01.28
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| 01:28
  
 
| |I will cut this paste in scilab console press enter.
 
| |I will cut this paste in scilab console press enter.
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|-
 
|-
  
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| 01.34
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| 01:34
  
 
| |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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|-
 
|-
  
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| 01.37
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| 01:37
  
 
| |The display is due to the command disp - the passed argument is displayed.
 
| |The display is due to the command disp - the passed argument is displayed.
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|-
 
|-
  
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| 01.42
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| 01:42
  
 
| |Recall that the for loop is used for integer values.
 
| |Recall that the for loop is used for integer values.
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|-
 
|-
  
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| 01.45
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| 01:45
  
 
| | In this case, four integer values, namely, 1, 3, 5 and 7 are displayed.
 
| | In this case, four integer values, namely, 1, 3, 5 and 7 are displayed.
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|-
 
|-
  
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| 01.50
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| 01:50
  
 
| |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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|-
 
|-
  
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|01.56
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|01:56
  
 
| | 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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|-
 
|-
  
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| 02.01
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| 02:01
  
 
| |Let us begin with the loop that displays i equal to 1 to 5.
 
| |Let us begin with the loop that displays i equal to 1 to 5.
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|-
 
|-
  
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| 02.10
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| 02:10
  
 
| | We will modify this code by introducing the break statement.
 
| | We will modify this code by introducing the break statement.
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|-
 
|-
  
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|02.18
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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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|-
 
|-
  
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|02.22
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|02:22
  
 
| | The iteration is not carried out till the last value of i, namely 5.
 
| | The iteration is not carried out till the last value of i, namely 5.
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|-
 
|-
  
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|02.27
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|02:27
  
 
| | When i is equal to 2, the if block is executed for the first time.
 
| | When i is equal to 2, the if block is executed for the first time.
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|-
 
|-
  
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| 02.30
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| 02:30
  
 
| | The break command, however, terminates the loop.
 
| | The break command, however, terminates the loop.
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|-
 
|-
  
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| 02.34
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| 02:34
  
 
|| If we want to get out of a loop when some intermediate condition is satisfied, we can use the break statement.
 
|| If we want to get out of a loop when some intermediate condition is satisfied, we can use the break statement.
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|-
 
|-
  
−
| 02.40
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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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|-
 
|-
  
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| 02.45
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| 02:45
  
 
| | 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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|-
 
|-
  
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|02.50
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|02:50
  
 
| | 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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|-
 
|-
  
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| 02.56
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| 02:56
  
 
| | We will introduce the continue statement here paste press enter
 
| | We will introduce the continue statement here paste press enter
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|-
 
|-
  
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| 03.06
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| 03:06
  
 
|| This results in i getting displayed only for 4 and 5.
 
|| This results in i getting displayed only for 4 and 5.
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|-
 
|-
  
−
| 03.10
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| 03:10
  
 
| | 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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|-
 
|-
  
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| 03.18
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| 03:18
  
 
| | The continue statement makes the program skip the rest of the loop.
 
| | The continue statement makes the program skip the rest of the loop.
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|-
 
|-
  
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| 03.22
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| 03:22
  
 
| Unlike the break statement, however, it does not exit the loop.
 
| Unlike the break statement, however, it does not exit the loop.
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|-
 
|-
  
−
| 03.25
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| 03:25
  
 
| | The parameter i is incremented and all the calculations of the loop are executed for the new i.
 
| | The parameter i is incremented and all the calculations of the loop are executed for the new i.
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|-
 
|-
  
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| 03.32
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| 03:32
  
 
| | 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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|-
 
|-
  
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| 03.38
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| 03:38
  
 
| |Let us type less than or equal to with help
 
| |Let us type less than or equal to with help
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|-
 
|-
  
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| 03.46
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| 03:46
  
 
|| This opens the scilab help browser.
 
|| This opens the scilab help browser.
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|-
 
|-
  
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| 03.51
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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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|-
 
|-
  
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| 03.56
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| 03:56
  
 
| | So now after closing this we type help less
 
| | So now after closing this we type help less
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|-
 
|-
  
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|04.06
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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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|-
 
|-
  
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|04.11
+
|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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|-
 
|-
  
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| 04.16
+
| 04:16
  
 
| | For example, let us perform a loop over a vector:
 
| | For example, let us perform a loop over a vector:
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|-
 
|-
  
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| 04.24
+
| 04:24
  
 
| | This script displays all values of v.
 
| | This script displays all values of v.
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|-
 
|-
  
−
| 04.28
+
| 04:28
  
 
| | Until now we have been displaying only the variables.
 
| | Until now we have been displaying only the variables.
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|-
 
|-
  
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| 04.32
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| 04:32
  
 
| | We can indeed display the result of a calculation as well.
 
| | We can indeed display the result of a calculation as well.
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|-
 
|-
  
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| 04.35
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| 04:35
  
 
| | The following code displays the square of the numbers.
 
| | The following code displays the square of the numbers.
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|-
 
|-
  
−
|04.44
+
|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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|-
 
|-
  
−
| 04.48
+
| 04:48
  
 
| | Let us now move on to the while loops.
 
| | Let us now move on to the while loops.
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|-
 
|-
  
−
| 04.50
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| 04:50
  
 
| | 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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|-
 
|-
  
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| 04.55
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| 04:55
  
 
| | 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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|-
 
|-
  
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| 04.58
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| 04:58
  
 
| |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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|-
 
|-
  
−
| 05.02
+
| 05:02
  
 
| | If the program is written well, the expression becomes false and the loop is ended.
 
| | If the program is written well, the expression becomes false and the loop is ended.
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|-
 
|-
  
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| 05.08
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| 05:08
  
 
|| Now let us see an example for the while loop:
 
|| Now let us see an example for the while loop:
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|-
 
|-
  
−
|05.15
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|05:15
  
 
| | The values of i, from 1 to 6 are displayed.
 
| | The values of i, from 1 to 6 are displayed.
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|-
 
|-
  
−
|05.19
+
|05:19
  
 
|| Break and continue statements inside the while loop work exactly as they did in the for loop, as we demonstrate using break:
 
|| Break and continue statements inside the while loop work exactly as they did in the for loop, as we demonstrate using break:
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|-
 
|-
  
−
|05.33
+
|05:33
  
 
| | We can see that the moment i becomes equal to 3, the program exits the loop, thanks to the break statement.
 
| | We can see that the moment i becomes equal to 3, the program exits the loop, thanks to the break statement.
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|-
 
|-
  
−
| 05.39
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| 05:39
  
 
|| 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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|-
 
|-
  
−
| 05.44
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| 05:44
  
 
| | This brings us to the end of this spoken tutorial on iterative calculations using Scilab.
 
| | This brings us to the end of this spoken tutorial on iterative calculations using Scilab.
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|-
 
|-
  
−
| 05.50
+
| 05:50
  
 
|| 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.
  
 
|-
 
|-
−
| 05.57
+
| 05:57
 
| | 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].
  
 
|-
 
|-
−
| 06.00
+
| 06:00
 
| |Thanks for joining.Good bye.
 
| |Thanks for joining.Good bye.
  
 
|}
 
|}

Revision as of 17:00, 10 July 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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