Difference between revisions of "Scilab/C2/Vector-Operations/English-timed"
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Latest revision as of 11:29, 19 February 2015
| Time | Narration |
| 00:01 | Welcome to the spoken tutorial on Vector Operations. |
| 00:07 | At the end of this spoken tutorial you will be able to: |
| 00:11 | * Define a vector. |
| 00:13 | * Calculate length of a vector. |
| 00:15 | * Perform mathematical operations on Vectors such as addition,subtraction and multiplication. |
| 00:23 | * Define a matrix. |
| 00:25 | * Calculate size of a matrix. |
| 00:28 | * Perform mathematical operations on Matrices such as addition, subtraction and multiplication. |
| 00:36 | The Pre-requisites are: Scilab should be installed on your system. |
| 00:41 | You should have listened to the Spoken Tutorial on Getting started with Scilab. |
| 00:46 | You should have Basic knowledge about Vectors and Matrices. |
| 00:50 | I am using Windows 7 operating system and Scilab 5.2.2 for demonstration. |
| 00:58 | Click on Scilab shortcut icon on your Desktop to launch Scilab. |
| 01:03 | This will open the Scilab console window. |
| 01:06 | Notice that the cursor is on the command prompt. |
| 01:10 | I suggest that you practice this tutorial in Scilab simultaneously while pausing the video at regular intervals of time. |
| 01:19 | Let us start by defining a vector. |
| 01:22 | This can be done in two ways: |
| 01:24 | By using spaces as: p is equal to open square bracket one space 2 space 3 close the square bracket and press Enter |
| 01:37 | or using commas as: q is equal to open square bracket two comma three comma four close the square bracket and press Enter. |
| 01:53 | We can find the length of a vector p by the command length of p and press Enter. |
| 02:03 | We can perform various mathematical operations on vectors such as: |
| 02:08 | * Addition of two vectors |
| 02:11 | * Substraction of two vectors and so on. |
| 02:14 | Transpose of a vector can be found by using apostrophe (also known as single-quote). |
| 02:21 | p transpose is as shown. |
| 02:27 | We can calculate p-transpose times q. |
| 02:34 | The command p times q-transpose gives a scalar. |
| 02:43 | Please pause the tutorial now and attempt exercise number one given in the video. |
| 02:50 | Now we will see how to define a matrix. |
| 02:56 | Elements of a row of a matrix can be defined using spaces or commas similar to that shown for a vector. |
| 03:04 | For example, let us define a 2 by 3 matrix P by typing capital P is equal to open square bracket 1 space 2 space 3 semicolon |
| 03:20 | 4 space five space 6 close the square bracket and press Enter. |
| 03:27 | Note that semicolon is used for defining the next row of the matrix. |
| 03:32 | Recall that Scilab is case sensitive. |
| 03:34 | Here variable P used to define matrix is in upper case |
| 03:40 | which is different from small p that was a vector. |
| 03:44 | Would you want to check what small p is at this point? |
| 03:48 | We will now see how to find the size of a matrix using the size command. |
| 03:53 | For this, type open square bracket row comma column close the sqaure bracket is equal to size of capital P, which is the matrix, and press Enter. |
| 04:10 | You get the following output. |
| 04:17 | Note that the length command will give the total number of elements in the matrix as you see. |
| 04:27 | The transpose command works for the matrices as well, as shown here : |
| 04:34 | P transpose gives the transpose of matrix P. |
| 04:41 | Let us now define a 2 by 3 matrix Q: |
| 04:45 | Capital Q is equal to open square bracket one space five space three semicolon, to enter into the next row |
| 04:56 | two space four space eight, close the square bracket and press Enter. |
| 05:03 | Let us also recall P once more. |
| 05:08 | We can carry out calculations involving P and Q, just as we do in mathematics. |
| 05:14 | For example, let us calculate E is equal to 2 times P plus 3 times Q and press enter: |
| 05:29 | You may want to verify whether these calculations are correct. |
| 05:33 | Please pause the tutorial now and attempt exercise number two given with the video |
| 05:44 | In this tutorial, we have learnt to: |
| 05:47 | * Define a vector using spaces or commas. |
| 05:50 | * Calculate length of a vector using the length() function. |
| 05:54 | * Find the transpose of a vector or a matrix using apostrophe. |
| 05:59 | * Define a matrix by using space or comma to separate the columns and semicolon to separate the rows. |
| 06:07 | Find size of a matrix using size() function. |
| 06:11 | This spoken tutorial: has been created by the Free and Open Source Software in Science and Engineering Education (FOSSEE), |
| 06:18 | More information on the FOSSEE project could be obtained from fossee.in or scilab.in. |
| 06:28 | Supported by the National Mission on Eduction through ICT, MHRD, Government of India. |
| 06:33 | For more information, visit: spoken hyphen tutorial dot org slash NMEICT hyphen intro. |
| 06:43 | This is Anuradha Amrutkar, signing off. |
| 06:46 | Thank you for joining us. Good bye. |
Contributors and Content Editors
Gaurav, Jyotisolanki, Krupali, PoojaMoolya, Sandhya.np14, Sneha
