Difference between revisions of "Scilab/C4/File-handling/English-timed"

From Script | Spoken-Tutorial
Jump to: navigation, search
 
(3 intermediate revisions by one other user not shown)
Line 19: Line 19:
 
|-
 
|-
 
|00:11
 
|00:11
−
|'''write()''' function  
+
|'''write()''' function ,'''read()''' function
−
 
+
−
|-
+
−
| 00:12
+
−
|'''read''' function
+
  
 
|-
 
|-
 
|00:14
 
|00:14
−
|'''mopen()'''  
+
|'''mopen()''' , '''mclose()'''.  
−
 
+
−
|-
+
−
|00:15
+
−
|'''mclose()'''.  
+
  
 
|-
 
|-
Line 198: Line 190:
 
|-
 
|-
 
|03:39
 
|03:39
−
| '''new underscore vector is equal to read into bracket into quote random dash numbers dot txt comma 19 comma 1'''
+
| '''new underscore vector is equal to read into bracket into quotes random dash numbers dot txt comma 19 comma 1'''
  
 
|-
 
|-
Line 249: Line 241:
 
|04:30
 
|04:30
  
−
| r = opens the file for reading.  
+
| '''r''' = opens the file for reading.  
  
 
|-
 
|-
 
|04:34
 
|04:34
−
| rb = opens a binary file for reading.  
+
| '''rb''' = opens a binary file for reading.  
  
 
|-
 
|-
Line 259: Line 251:
 
| 04:39
 
| 04:39
  
−
| rt = opens a text file for reading.  
+
| '''rt''' = opens a text file for reading.  
  
 
|-
 
|-
Line 265: Line 257:
 
|04:43
 
|04:43
  
−
||w = creates a new file for writing or opens and truncates a file to zero length.  
+
||'''w''' = creates a new file for writing or opens and truncates a file to zero length.  
  
 
|-
 
|-
Line 271: Line 263:
 
|04:50
 
|04:50
  
−
| wb = creates a new binary file for writing or opens and truncates a file to zero length.  
+
| '''wb''' = creates a new binary file for writing or opens and truncates a file to zero length.  
  
 
|-
 
|-
Line 277: Line 269:
 
| 04:58
 
| 04:58
  
−
| |wt = creates a text binary file for writing or opens and truncates a file to zero length.  
+
| |'''wt''' = creates a text binary file for writing or opens and truncates a file to zero length.  
  
 
|-
 
|-
Line 283: Line 275:
 
| 05:06
 
| 05:06
  
−
|a or ab = appends (opens a file for writing at the end of the file or creates a file for writing).  
+
|'''a or ab''' = appends (opens a file for writing at the end of the file or creates a file for writing).  
  
 
|-
 
|-
Line 289: Line 281:
 
| 05:14
 
| 05:14
  
−
| r+ or r+b = opens a file for update (reading and writing).  
+
| '''r+ or r+b''' = opens a file for update (reading and writing).  
  
 
|-
 
|-
Line 337: Line 329:
 
|05:55
 
|05:55
  
−
| We have learnt -  
+
| We have learnt - File handling with the following functions:  
−
 
+
−
|-
+
−
 
+
−
| 05:56
+
−
 
+
−
| File handling with the following functions:  
+
  
 
|-
 
|-
Line 349: Line 335:
 
|05:59
 
|05:59
  
−
||'''write()''' function  
+
||'''write()''' function , '''read()''' function  
−
 
+
−
|-
+
−
 
+
−
| 06:00
+
−
 
+
−
| '''read()''' function  
+
  
 
|-
 
|-
Line 361: Line 341:
 
| 06:02
 
| 06:02
  
−
| '''mopen()'''  
+
| '''mopen()''' , '''mclose()'''.  
−
 
+
−
|-
+
−
 
+
−
| 06:03
+
−
 
+
−
| '''mclose()'''.  
+
  
 
|-
 
|-

Latest revision as of 15:09, 3 October 2017

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 ,read() function
00:14 mopen() , 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 quotes 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 - File handling with the following functions:
05:59 write() function , read() function
06:02 mopen() , 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

Retrieved from "https://script.spoken-tutorial.org/index.php?title=Scilab/C4/File-handling/English-timed&oldid=39520"