Difference between revisions of "Scilab/C2/Conditional-Branching/English-timed"
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Revision as of 16:42, 10 July 2014
| Time | Narration |
| 00:01 | Welcome to the spoken tutorial on Conditional Branching in Scilab. |
| 00:04 | To practice this tutorial open the scilab console window on your computer |
| 00:09 | We will discuss two types of Conditional constructs in Scilab that is the "if-then-else" construct and the "select-case conditional" construct. |
| 00:19 | The if statement allows us to execute a group of statements if a given condition is satisfied. |
| 00:24 | Let me give you an example: |
| 00:27 | n is equal 42 if n is equal to equal to 42 then disp the number is 42, end of if construct. |
| 00:37 | Here 'is equal to' is the assignment operator, which assigns 42 to the variable n, |
| 00:43 | And 'is equal to is equal to' is the equality operator, which checks for the equality between the right hand and the left hand side operands. |
| 00:51 | In this case n and 42 and gives the result in Boolean. |
| 00:57 | Here the comma after the first line is optional, |
| 01:01 | Also the then keyword is optional. |
| 01:04 | It can be replaced by a comma or a carriage return. |
| 01:08 | The end keyword ends the "if" construct. |
| 01:11 | On executing the script, we see the output as follows. |
| 01:20 | So far we have seen how to execute a set of statements if a condition is true. |
| 01:26 | Now we will see how to execute another set of statements if that condition is false or we may wish to check if some other condition is satisfied. |
| 01:36 | We can do this by using 'else' or 'elseif' keyword respectively. |
| 01:40 | Here is how we do it |
| 01:41 | In this example, 54 is assigned to a variable n and checked for both true condition using 'if' and false condition using 'else' as described: |
| 01:55 | I will cut this, paste in the scilab console hit enter |
| 02:03 | You see the output. |
| 02:05 | If you notice, the examples shown above are on multiple lines. |
| 02:09 | They can also be written in a single line with proper semicolons and commas. |
| 02:19 | I will cut this and paste in the scilab to execute. Hit enter |
| 02:27 | The select statement allows to combine several branches in a clear and simple way. |
| 02:31 | Depending on the value of a variable, it allows to perform the statement corresponding to the case keyword. |
| 02:38 | There can be as many branches as required. |
| 02:41 | Let us try with an example. |
| 02:44 | We will assign 100 to a variable 'n' and check the cases 42, 54 and a default case represented by else. |
| 02:59 | Cut, paste hit enter |
| 03:06 | Here we see the output . |
| 03:09 | This brings us to the end of this spoken tutorial on Conditional Branching using Scilab. |
| 03:14 | In this tutorial we have learnt the if - elseif - else statement and the select statement. |
| 03:20 | There are many other functions in Scilab which will be covered in other spoken tutorials. |
| 03:25 | Keep watching the Scilab links. |
| 03:27 | Spoken Tutorials are part of the Talk to a Teacher project, supported by the National Mission on Education through ICT. |
| 03:35 | More information on the same is available on the following link |
| 03:38 | Thanks for joining good bye. |
