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

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|-
 
|-
 
|00:11
 
|00:11
|'''Write Function'''  
+
|'''write()''' function ,'''read()''' function
 
+
|-
+
| 00:12
+
|'''Read Function'''  
+
  
 
|-
 
|-
 
|00:14
 
|00:14
|'''mopen'''  
+
|'''mopen()''' , '''mclose()'''.
 
+
|-
+
|00:15
+
|'''mclose'''  
+
  
 
|-
 
|-
 
| 00:16
 
| 00:16
|For demonstration I am using '''Ubuntu Linux 12.04''' operating system with '''Scilab''' version 5.3.3 installed.  
+
|For demonstration, I am using '''Ubuntu Linux 12.04''' operating system with '''Scilab''' version 5.3.3 installed.  
  
 
|-
 
|-
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|01:07
 
|01:07
  
|Switch to the scilab console window.  
+
|Switch to the Scilab console window.  
  
 
|-
 
|-
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| 01:15
 
| 01:15
|| Type; ''' random underscore matrix is equal to rand into bracket 20 comma 1 close the bracket semicolon and press enter'''
+
|| Type: ''' random underscore matrix is equal to rand into bracket 20 comma 1 close the bracket semicolon''' and press '''Enter'''.
  
 
|-
 
|-
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|01:32
 
|01:32
  
|| Type  '''pwd '''
+
|| Type  '''pwd '''.
  
 
|-
 
|-
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|01:34
 
|01:34
  
| In my case the present working directory is '''slash home slash fossee '''
+
| In my case, the present working directory is '''slash home slash fossee '''.
  
 
|-
 
|-
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|01:39
 
|01:39
  
| Make sure that you are in a directory where you have read & write permission , before you execute these commands.  
+
| Make sure that you are in a directory where you have '''read''' & '''write''' permission, before you execute these commands.  
  
 
|-
 
|-
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|01:47
 
|01:47
  
|| Now we will write the content of variable '''random underscore matrix''' into a text file using the write command.  
+
|| Now we will write the content of variable '''random underscore matrix''' into a text file using the '''write''' command.  
  
 
|-
 
|-
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|01:55
 
|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'''
+
| Type:--> '''write into bracket into quotes random dash numbers dot txt close the quotes comma random underscore matrix close the bracket''' and press '''Enter'''.
  
 
|-
 
|-
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|-
 
|-
 
| 02:21
 
| 02:21
||I will minimize the '''scilab''' console window.  
+
||I will minimize the '''Scilab''' console window.  
  
 
|-
 
|-
 
| 02:23
 
| 02:23
|And open the file which will be created and saved in the fossee directory of my computer.  
+
|And open the file which will be created and saved in the '''fossee''' directory of my computer.  
  
 
|-
 
|-
  
 
| 02:33
 
| 02:33
|| You can see the data from variable '''random underscore matrix is written in a text file random dash numbers dot txt'''
+
|| You can see the data from variable '''random underscore matrix''' is written in a text file '''random dash numbers dot txt'''.
  
 
|-
 
|-
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|02:45
 
|02:45
  
| Coming back to the scilab console.  
+
| Coming back to the '''Scilab''' console.  
 
   
 
   
 
|-
 
|-
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| 02:50
 
| 02:50
|| For this we will use the command read as follows,
+
|| For this we will use the command '''read''' as follows:
  
 
|-
 
|-
 
| 02:55
 
| 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'''.
+
| 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
 
|03:18
| The read command reads all the data from the file mentioned in the argument,  
+
| The '''read''' command reads all the data from the file mentioned in the argument,  
  
 
|-
 
|-
 
| 03:23
 
| 03:23
| In this case '''random dash numbers dot txt''',
+
| in this case '''random dash numbers dot txt''',
  
 
|-
 
|-
 
| 03:27
 
| 03:27
| And stores in the variable '''new underscore vector'''
+
| and stores in the variable '''new underscore vector'''.
  
 
|-
 
|-
 
| 03:31
 
| 03:31
|  Press Enter to continue the display  
+
|  Press '''Enter''' to continue the display.
  
 
|-
 
|-
 
|03:35
 
|03:35
| If we modify the above command as  
+
| If we modify the above command as:
  
 
|-
 
|-
 
|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'''
  
 
|-
 
|-
 
| 03:49
 
| 03:49
| The read command reads only 19 data values from the file mentioned in this argument.
+
| The '''read''' command reads only 19 data values from the file mentioned in this argument,
  
 
|-
 
|-
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| 03:56
 
| 03:56
  
|In this case '''random dash numbers dot txt'''
+
|in this case '''random dash numbers dot txt''',
  
 
|-
 
|-
  
 
| 03:59
 
| 03:59
|| And stores in the variable '''new underscore vector'''.  
+
||and stores in the variable '''new underscore vector'''.  
  
 
|-
 
|-
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| 04:03
 
| 04:03
  
| |Issue this command on the '''scilab''' console and verify the output.  
+
| |Issue this command on the '''Scilab''' console and verify the output.  
  
 
|-
 
|-
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|04:08
 
|04:08
  
||Now let us see about the mopen function:  
+
||Now let us see about the '''mopen()''' function:  
  
 
|-
 
|-
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| 04:17
 
| 04:17
  
|mopen command is used to open an existing file in a way compatible to C fopen procedure.  
+
|'''mopen''' command is used to open an existing file in a way compatible to C '''fopen''' procedure.  
  
 
|-
 
|-
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| 04:25
 
| 04:25
  
| mode is a character string that controls whether the file is opened for  
+
| '''mode''' is a character string that controls whether the file is opened for:
  
 
|-
 
|-
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|04:30
 
|04:30
  
| r = Opens the file for reading.  
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| '''r''' = opens the file for reading.  
  
 
|-
 
|-
 
|04:34
 
|04:34
| rb = Opens a binary file for reading.  
+
| '''rb''' = opens a binary file for reading.  
  
 
|-
 
|-
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| 04:39
 
| 04:39
  
| rt = Opens a text file for reading.  
+
| '''rt''' = opens a text file for reading.  
  
 
|-
 
|-
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|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.  
  
 
|-
 
|-
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|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.  
  
 
|-
 
|-
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| 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.  
  
 
|-
 
|-
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| 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).  
  
 
|-
 
|-
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| 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).
  
 
|-
 
|-
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| 05:20
 
| 05:20
  
| For eg '''fd underscore r is equal to mopen('random-numbers,'rt')'''
+
| For eg. '''fd underscore r is equal to mopen('random-numbers,'rt')'''
  
 
|-
 
|-
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| 05:30
 
| 05:30
  
||the above command opens the 'random-numbers' as a text and read-only mode.  
+
||The above command opens the 'random-numbers' as a 'text and read-only' mode.  
  
 
|-
 
|-
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| 05:37
 
| 05:37
  
||'''mclose into bracket fd''':  
+
||'''mclose'''  into bracket '''fd''':  
  
 
|-
 
|-
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| 05:40
 
| 05:40
  
|| closes the opened file by using mopen.
+
|| closes the opened file by using '''mopen'''
  
 
|-
 
|-
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| 05:43
 
| 05:43
  
|where fd is the file descriptor of the opened file  
+
|where '''fd''' is the '''file descriptor''' of the opened file.
  
 
|-
 
|-
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| 05:48
 
| 05:48
  
| If fd is omitted mclose closes the last opened file.  
+
| If '''fd''' is omitted, '''mclose()''' closes the last opened file.  
  
 
|-
 
|-
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|05:55
 
|05:55
  
| We have learnt -  
+
| We have learnt - File handling with the following functions:  
 
+
|-
+
 
+
| 05:56
+
 
+
| File Handling with the following functions:  
+
  
 
|-
 
|-
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|05:59
 
|05:59
  
||'''write()''' function  
+
||'''write()''' function , '''read()''' function  
 
+
|-
+
 
+
| 06:00
+
 
+
| '''Read()''' function  
+
  
 
|-
 
|-
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| 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