Scilab/C4/File-handling/English-timed

Time	Narration
00:01	Welcome to this spoken tutorial on File Handling using Scilab.
00:06	In this tutorial, we will learn
00:08	file handling with the following functions:
00:11	write() function
00:12	read() function
00:14	mopen()
00:15	mclose().
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 please visit spoken hyphen tutorial dot org.
00:36	Now we will see some functions in Scilab which are useful for file handling.
00:41	File handling involves-
00:44	writing to a file using write() function,
00:47	reading from a file using read() function,
00:51	opening an existing file using mopen() function and
00:55	closing an already opened file using mclose() function.
01:00	Let us start with writing data to a file.
01:03	For this purpose the write() command is used.
01:07	Switch to the Scilab console window.
01:10	To begin with let us create a matrix of random numbers.
01:15	Type: random underscore matrix is equal to rand into bracket 20 comma 1 close the bracket semicolon and press Enter.
01:29	Now check the present working directory.
01:32	Type pwd .
01:34	In my case, the present working directory is slash home slash fossee .
01:39	Make sure that you are in a directory where you have read & write permission, before you execute these commands.
01:47	Now we will write the content of variable random underscore matrix into a text file using the write command.
01:55	Type:--> write into bracket into quotes random dash numbers dot txt close the quotes comma random underscore matrix close the bracket and press Enter.
02:18	Let us see whether this file has been created.
02:21	I will minimize the Scilab console window.
02:23	And open the file which will be created and saved in the fossee directory of my computer.
02:33	You can see the data from variable random underscore matrix is written in a text file random dash numbers dot txt.
02:42	I will close this file.
02:45	Coming back to the Scilab console.
02:47	Now we will see how to read the data from a file.
02:50	For this we will use the command read as follows:
02:55	Type: new underscore vector is equal to read into bracket into quote random dash numbers dot txt close the quotes comma 20 comma 1 close the bracket and press Enter.
03:18	The read command reads all the data from the file mentioned in the argument,
03:23	in this case random dash numbers dot txt,
03:27	and stores in the variable new underscore vector.
03:31	Press Enter to continue the display.
03:35	If we modify the above command as:
03:39	new underscore vector is equal to read into bracket into quote random dash numbers dot txt comma 19 comma 1
03:49	The read command reads only 19 data values from the file mentioned in this argument,
03:56	in this case random dash numbers dot txt,
03:59	and stores in the variable new underscore vector.
04:03	Issue this command on the Scilab console and verify the output.
04:08	Now let us see about the mopen() function:
04:12	fd = mopen into bracket file-name comma mode
04:17	mopen command is used to open an existing file in a way compatible to C fopen procedure.
04:25	mode is a character string that controls whether the file is opened for:
04:30	r = opens the file for reading.
04:34	rb = opens a binary file for reading.
04:39	rt = opens a text file for reading.
04:43	w = creates a new file for writing or opens and truncates a file to zero length.
04:50	wb = creates a new binary file for writing or opens and truncates a file to zero length.
04:58	wt = creates a text binary file for writing or opens and truncates a file to zero length.
05:06	a or ab = appends (opens a file for writing at the end of the file or creates a file for writing).
05:14	r+ or r+b = opens a file for update (reading and writing).
05:20	For eg. fd underscore r is equal to mopen('random-numbers,'rt')
05:30	The above command opens the 'random-numbers' as a 'text and read-only' mode.
05:37	mclose into bracket fd:
05:40	closes the opened file by using mopen
05:43	where fd is the file descriptor of the opened file.
05:48	If fd is omitted, mclose() closes the last opened file.
05:53	That's all we have in this tutorial.
05:55	We have learnt -
05:56	File handling with the following functions:
05:59	write() function
06:00	read() function
06:02	mopen()
06:03	mclose().
06:05	Watch the video available at the following link.
06:08	It summarizes the Spoken Tutorial project.
06:11	If you do not have good bandwidth, you can download and watch it.
06:14	The spoken tutorial Team:
06:17	Conducts workshops using spoken tutorials
06:20	Gives certificates to those who pass an online test.
06:23	For more details, please write to conatct@spoken-tutorial.org.
06:30	Spoken Tutorial Project is a part of the Talk to a Teacher project.
06:34	It is supported by the National Mission on Eduction through ICT, MHRD, Government of India.
06:41	More information on this mission is available at http://spoken-tutorial.org/NMEICT-Intro.
06:50	This is Anuradha Amrutkar from IIT Bombay, signing off.
06:54	Thank you for joining.

Contributors and Content Editors

PoojaMoolya, Pratik kamble, Sandhya.np14