Difference between revisions of "Scilab/C4/User-Defined-Input-and-Output/English-timed"
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Revision as of 11:42, 10 March 2017
| Time | Narration |
| 00:01 | Welcome to the spoken tutorial on File handling using Scilab. |
| 00:06 | In this tutorial, we will learn: |
| 00:08 | Input Function |
| 00:10 | Formatting the Output |
| 00:12 | save function |
| 00:14 | load function . |
| 00:16 | For demonstration I am using Ubuntu Linux 12.04 operating system with Scilab version 5.3.3 installed. |
| 00:26 | You should have basic knowledge of Scilab. |
| 00:29 | If not, for relevant spoken tutorials on Scilab please visit spoken hyphen tutorial dot org. |
| 00:37 | The input() function is used to take the input from the user. |
| 00:42 | It provides a prompt in the text string for user input. |
| 00:47 | It waits for input from the keyboard. |
| 00:51 | If nothing but a carriage return is entered at the prompt, input() function returns an empty matrix. |
| 00:59 | The input function can be written in two ways: |
| 01:03 | First, x= input into brackets "message to display" |
| 01:09 | second, x= input into brackets ("message to display", "strings"). |
| 01:17 | In the second example, the second argument is “string”. |
| 01:22 | So the output is a character string which is the expression entered using the keyboard. |
| 01:29 | Switch to the Scilab console window and type, |
| 01:33 | x is equal to input open bracket inside double quotes Enter your age close the double quotes close the bracket and press Enter. |
| 01:49 | Type 25 and press Enter. |
| 01:53 | Now type -->y is equal to input into bracket into double quotes Enter your age close the double quotes comma again inside double quotes write string close the bracket and press Enter. |
| 02:14 | type 25 and press Enter. |
| 02:18 | We see that in both the cases the input we entered through keyboard, was a number 25. |
| 02:25 | Now, let us check the type of variable that x and y are. |
| 02:30 | Let us clear the console using clc command. |
| 02:34 | We are doing this to validate the use and importance of the argument “string”, given in the second example. |
| 02:42 | To check the type of variable, let us type |
| 02:45 | -->typeof into brackets x and press Enter. |
| 02:51 | Similarly, typeof(y) and press Enter. |
| 02:57 | You can see it yourself that the first answer stored in x is of type constant and |
| 03:04 | second answer stored in y, with the argument “string” included in the command, is of type string. |
| 03:12 | Let us now see how to format the output that is displayed on the console. |
| 03:17 | This can be done using the mprintf() function. |
| 03:22 | mprintf() function converts, formats and writes data on to the Scilab console. |
| 03:28 | It is an interface for C-coded version of printf() function. |
| 03:34 | Let us see an example for this. Switch to the console. |
| 03:38 | Type-->mprintf into bracket into quotes type At iteration percent i comma Result is colon slash n alpha is equal to percentf comma 33 comma 0.535 close the bracket. |
| 04:12 | Here 33 will be displayed in place of percent i (%i) and point 535 (0.535) will be displayed in place of percent f (%f) as a flow. Press Enter. |
| 04:26 | This will give the output as At iteration 33, Result is alpha is equal to 0.535000. |
| 04:39 | Clear the console. Now let us see another example. |
| 04:44 | mprintf open bracket into quotes Value of x is equal to percentage d is taken as a CONSTANT comma while value of y is equal to percent s is taken as a STRING close the quotes comma x comma y close the bracket. |
| 05:19 | In the above example percentage d (%d) is used to insert a constant data stored in variable x and |
| 05:28 | percentage s (%s) is used to insert a string data stored in variable y. press Enter, you see the output. |
| 05:38 | Now, let us discuss the use of save and load commands. |
| 05:43 | To quit Scilab midway through a calculation and to |
| 05:47 | continue at a later stage, type save thissession. |
| 05:52 | This will save the current values of all variables to a file called thissession. |
| 05:58 | This file cannot be edited. |
| 06:01 | It is in binary format. |
| 06:04 | When you next start Scilab, type load thissession |
| 06:08 | and the computation can be resumed where you left off. |
| 06:13 | The purpose of save and load functions are |
| 06:16 | The save() command saves all the Scilab current variables in a binary file. |
| 06:22 | If the variable is a graphic handle, the save function saves all the corresponding graphics_entities definition. |
| 06:31 | The file can be given either by its path or by its descriptor previously given. |
| 06:37 | save(filename) saves all the current variables in a file defined by filename. |
| 06:45 | save into bracket fd saves all the current variables in the file defined by the descriptor fd. |
| 06:53 | save(filename,x,y) or save(fd,x,y) saves only named variables x and y. |
| 07:02 | Let us see an example to illustrate the save and load commands usage. |
| 07:07 | Switch back to the console. Let us define two matrices, say a and b. |
| 07:14 | -->a = eye of (2,2) and press Enter. |
| 07:22 | Type b=ones(a) and press Enter. |
| 07:28 | Clear the console using clc command. Now type |
| 07:34 | save space matrix dash a dash b |
| 07:42 | or it can also be written as: |
| 07:46 | save into brackets into quotes matrix dash a dash b dot dat close the quotes comma a comma b close the bracket and press Enter. |
| 08:03 | This saves the values of variables in a binary file 'matrix dash a dash b dot dat' (matrix-a-b.dat) in the present working directory. |
| 08:12 | You can browse the present working directory to check the existence of this binary file. |
| 08:17 | You can see it here. I will close the file browser. |
| 08:22 | Now let us load the file back in to the variables. |
| 08:26 | Before this, let us clear the variables a and b . |
| 08:29 | Type clear a space b, press Enter. |
| 08:34 | Let us cross check if these variables are really cleared. |
| 08:39 | ->a , b |
| 08:41 | Now let us load back the values from the binary files in these variables a and b using the load command. |
| 08:49 | Type: load into bracket into quote matrix dash a dash b dot dat close the quotes comma into quotes a comma into quotes b close the bracket and press Enter. |
| 09:08 | Let us check the values in variables a and b. Clear the console. |
| 09:14 | Type -->a and-->b |
| 09:18 | You can see the values are loaded back in the variables. |
| 09:23 | In this tutorial we learnt - |
| 09:24 | Input function using input command |
| 09:28 | Formatting the output using mprintf command |
| 09:31 | save function |
| 09:33 | load function |
| 09:35 | Watch the video available at the link shown below. |
| 09:38 | It summarizes the Spoken Tutorial project. |
| 09:41 | If you do not have good bandwidth, you can download and watch it. |
| 09:46 | The spoken tutorial Team: |
| 09:48 | Conducts workshops using spoken tutorials. |
| 09:51 | Gives certificates to those who pass an online test. |
| 09:54 | For more details, please write to conatct@spoken-tutorial.org. |
| 10:01 | Spoken Tutorial Project is a part of the Talk to a Teacher project. |
| 10:05 | It is supported by the National Mission on Eduction through ICT, MHRD, Government of India. |
| 10:12 | More information on this mission is available at http://spoken-tutorial.org/NMEICT-Intro. |
| 10:23 | This is Anuradha Amrutkar from IIT Bombay, signing off. |
| 10:26 | Thank you for joining. |
