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

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{| Border=1
 
{| Border=1
  
−
|| Time
+
|| '''Time'''
  
−
|| Narration
+
|| '''Narration'''
  
 
|-
 
|-
−
| 00.01
+
| 00:01
−
|Welcome to this spoken tutorial on File Handling using Scilab.  
+
|Welcome to this spoken tutorial on '''File Handling''' using '''Scilab'''.  
  
 
|-
 
|-
−
| 00.06.
+
| 00:06
 
| In this tutorial, we will learn  
 
| In this tutorial, we will learn  
  
 
|-
 
|-
−
|00.08
+
|00:08
−
|'''File Handling''' with the following functions;
+
|file handling with the following functions:
  
 
|-
 
|-
−
|00.11
+
|00:11
−
|'''Write Function'''  
+
|'''write()''' function ,'''read()''' function
  
 
|-
 
|-
−
| 00.12
+
|00:14
−
|'''Read Function'''  
+
|'''mopen()''' , '''mclose()'''.
  
 
|-
 
|-
−
|00.14
+
| 00:16
−
|'''mopen'''  
+
|For demonstration, I am using '''Ubuntu Linux 12.04''' operating system with '''Scilab''' version 5.3.3 installed.
  
 
|-
 
|-
−
|00.15
+
| 00:26
−
|'''mclose'''  
+
| You should have basic knowledge of '''Scilab'''.
  
 
|-
 
|-
−
| 00.16
+
|00:29
−
|For Demonstration i am using '''Ubuntu Linux12.04''' operating system with '''Scilab''' version 5.3.3 installed
+
| If not, for relevant spoken tutorials please visit '''spoken hyphen tutorial dot org'''.  
  
 
|-
 
|-
−
| 00.26
+
|00:36
−
| You should have Basic knowledge of '''Scilab'''.  
+
|| Now we will see some '''functions''' in '''Scilab''' which are useful for file handling.
  
 
|-
 
|-
−
|00.29
+
| 00:41
−
| If not, for relevant spoken tutorials please visit '''spoken hyphen tutorial dot org'''
+
|File handling involves-
  
 
|-
 
|-
−
|00.36
+
|00:44
−
|| Now we will see some functions in '''scilab''' which are useful for '''File Handling'''.
+
| writing to a file using '''write()''' function,
  
 
|-
 
|-
−
| 00.41
 
−
|'''File Handling''' involves-
 
  
 +
| 00:47
  
−
|-
+
| reading from a file using '''read()''' function,  
−
|00.44
+
−
| writing to a file using '''write function''',  
+
  
 
|-
 
|-
−
 
+
| 00:51
−
| 00.47
+
| opening an existing file using '''mopen()''' function and
−
 
+
−
| reading from a file using '''read function''',
+
  
 
|-
 
|-
−
| 00.51
+
| 00:55
−
| opening an existing file using '''mopen function''' and
+
| closing an already opened file using '''mclose()''' function.
  
 
|-
 
|-
−
| 00.55
+
|01:00
−
| closing an already opened file using '''mclose function'''.
+
−
 
+
−
|-
+
−
|01.00
+
 
| Let us start with writing data to a file.  
 
| Let us start with writing data to a file.  
  
 
|-
 
|-
−
|01.03
+
|01:03
 
|For this purpose the '''write()''' command is used.  
 
|For this purpose the '''write()''' command is used.  
−
 
  
 
|-
 
|-
  
−
|01.07
+
|01:07
  
−
|Switch to the scilab console window.  
+
|Switch to the Scilab console window.  
  
 
|-
 
|-
  
−
|01.10
+
|01:10
  
 
|To begin with let us create a matrix of random numbers.  
 
|To begin with let us create a matrix of random numbers.  
Line 95: Line 85:
 
|-
 
|-
  
−
| 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'''.
−
 
+
  
 
|-
 
|-
  
−
| 01.29
+
| 01:29
  
 
| Now check the present working directory.  
 
| Now check the present working directory.  
Line 107: Line 96:
 
|-
 
|-
  
−
|01.32
+
|01:32
−
 
+
−
|| Type  '''pwd '''
+
  
 +
|| Type  '''pwd '''.
  
 
|-
 
|-
  
−
|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 '''.
  
 
|-
 
|-
  
−
|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.
  
 
|-
 
|-
  
−
|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.
  
 
|-
 
|-
  
−
|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'''.
  
 
|-
 
|-
−
|02.18
+
|02:18
 
|Let us see whether this file has been created.  
 
|Let us see whether this file has been created.  
  
 
|-
 
|-
−
| 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'''.
  
 
|-
 
|-
  
−
|02.42
+
|02:42
  
 
|| I will close this file.
 
|| I will close this file.
Line 165: Line 149:
 
|-
 
|-
  
−
|02.45
+
|02:45
  
−
| Coming back to the scilab console.  
+
| Coming back to the '''Scilab''' console.  
 
   
 
   
 
|-
 
|-
  
−
|02.47
+
|02:47
  
 
| Now we will see how to read the data from a file.
 
| Now we will see how to read the data from a file.
Line 177: Line 161:
 
|-
 
|-
  
−
| 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,
  
 
|-
 
|-
  
−
| 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'''.  
  
 
|-
 
|-
  
−
| 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.
  
 
|-
 
|-
  
−
|04.08
+
|04:08
−
 
+
−
||Now let us see about the mopen function:  
+
  
 +
||Now let us see about the '''mopen()''' function:
  
 
|-
 
|-
  
−
|04.12
+
|04:12
  
 
||'''fd = mopen into bracket file-name comma mode'''
 
||'''fd = mopen into bracket file-name comma mode'''
Line 248: Line 227:
 
|-
 
|-
  
−
| 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.
  
 
|-
 
|-
  
−
| 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:
  
 
|-
 
|-
  
−
|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.  
−
 
+
  
 
|-
 
|-
  
−
| 04.39
+
| 04:39
−
 
+
−
| rt = Opens a text file for reading.
+
−
 
+
  
 +
| '''rt''' = opens a text file for reading.
  
 
|-
 
|-
  
−
|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.
  
 
|-
 
|-
  
−
|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.
  
 
|-
 
|-
  
−
| 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.
  
 
|-
 
|-
  
−
| 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).
  
 
|-
 
|-
  
−
| 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).
  
 
|-
 
|-
  
−
| 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')'''
  
 
|-
 
|-
  
−
| 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.
  
 
|-
 
|-
  
−
| 05.37
+
| 05:37
  
−
||mclose into bracket fd:  
+
||'''mclose'''  into bracket '''fd''':  
  
 
|-
 
|-
  
−
| 05.40
+
| 05:40
  
−
|| closes the opened file by using mopen.
+
|| closes the opened file by using '''mopen'''
  
 
|-
 
|-
  
−
| 05.43
+
| 05:43
  
−
|where fd is the file descriptor of the opened file  
+
|where '''fd''' is the '''file descriptor''' of the opened file.
  
 
|-
 
|-
  
−
| 05.48
+
| 05:48
  
−
| If fd is omitted mclose closes the last opened file.  
+
| If '''fd''' is omitted, '''mclose()''' closes the last opened file.  
  
 
|-
 
|-
  
−
|05.53
+
|05:53
  
 
|That's all we have in this tutorial.  
 
|That's all we have in this tutorial.  
−
 
  
 
|-
 
|-
  
−
|05.55
+
|05:55
−
 
+
−
| We have learnt -
+
  
 +
| We have learnt -  File handling with the following functions:
  
 
|-
 
|-
  
−
| 05.56
+
|05:59
−
 
+
−
| File Handling with the following functions:  
+
  
 +
||'''write()''' function , '''read()''' function
  
 
|-
 
|-
  
−
|05.59
+
| 06:02
−
 
+
−
||''' Write Function'''
+
−
 
+
  
 +
| '''mopen()''' , '''mclose()'''.
  
 
|-
 
|-
  
−
| 06.00
+
|06:05
−
 
+
−
| '''Read Function'''
+
  
 +
| Watch the video available at the following link.
  
 
|-
 
|-
  
−
| 06.02
+
| 06:08
−
 
+
−
| '''mopen'''
+
−
 
+
  
 +
| It summarizes the Spoken Tutorial project.
  
 
|-
 
|-
  
−
| 06.03
+
|06:11
−
 
+
−
| '''mclose'''
+
  
 +
||If you do not have good bandwidth, you can download and watch it.
  
 
|-
 
|-
  
−
|06.05
+
|06:14
−
 
+
−
| Watch the video available at the following link
+
−
|-
+
−
 
+
−
| 06.08
+
−
 
+
−
| It summarises the Spoken Tutorial project
+
−
 
+
  
 +
||The spoken tutorial Team:
  
 
|-
 
|-
  
−
|06.11
+
|06:17
−
 
+
−
||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  
 
||Conducts workshops using spoken tutorials  
−
 
  
 
|-
 
|-
  
−
|06.20
+
|06:20
−
 
+
−
||Gives certificates to those who pass an online test
+
  
 +
||Gives certificates to those who pass an online test.
  
 
|-
 
|-
  
−
|06.23
+
|06:23
−
 
+
−
||For more details, please write to conatct@spoken-tutorial.org
+
  
 +
||For more details, please write to conatct@spoken-tutorial.org.
  
 
|-
 
|-
  
−
|06.30
+
|06:30
−
 
+
−
|Spoken Tutorial Project is a part of the Talk to a Teacher project
+
−
 
+
  
 +
|Spoken Tutorial Project is a part of the Talk to a Teacher project.
  
 
|-
 
|-
  
−
| 06.34
+
| 06:34
  
 
| It is supported by the National Mission on Eduction through ICT, MHRD, Government of India.  
 
| It is supported by the National Mission on Eduction through ICT, MHRD, Government of India.  
 
|-
 
|-
  
−
| 06.41
+
| 06:41
  
−
|More information on this mission is available at  http://spoken-tutorial.org/NMEICT-Intro
+
|More information on this mission is available at  http://spoken-tutorial.org/NMEICT-Intro.
  
 
|-
 
|-
  
−
| 06.50
+
| 06:50
  
−
|This is Anuradha Amrutkar from IIT Bombay signing off.
+
|This is Anuradha Amrutkar from IIT Bombay, signing off.
  
 
|-
 
|-
  
−
|06.54
+
|06:54
  
 
| Thank you for joining.
 
| Thank you for joining.

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"