Difference between revisions of "Scilab/C4/File-handling/English-timed"
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|00.08 | |00.08 | ||
| − | |File Handling with the following functions; | + | |'''File Handling''' with the following functions; |
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|00.15 | |00.15 | ||
| − | |mclose | + | |'''mclose''' |
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| 00.16 | | 00.16 | ||
| − | |For Demonstration i am using Ubuntu Linux12.04 operating system with Scilab version 5.3.3 installed | + | |For Demonstration i am using '''Ubuntu Linux12.04''' operating system with '''Scilab''' version 5.3.3 installed |
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| 00.26 | | 00.26 | ||
| − | | You should have Basic knowledge of Scilab. | + | | You should have Basic knowledge of '''Scilab'''. |
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|00.29 | |00.29 | ||
| − | | If not, for relevant spoken tutorials please visit spoken hyphen tutorial dot org | + | | If not, for relevant spoken tutorials please visit '''spoken hyphen tutorial dot org''' |
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|00.36 | |00.36 | ||
| − | || Now we will see some functions in scilab which are useful for File Handling. | + | || Now we will see some functions in '''scilab''' which are useful for '''File Handling'''. |
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| 00.41 | | 00.41 | ||
| − | |File Handling involves- | + | |'''File Handling''' involves- |
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|00.44 | |00.44 | ||
| − | | writing to a file using write function, | + | | writing to a file using '''write function''', |
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| 00.47 | | 00.47 | ||
| − | | reading from a file using read function, | + | | reading from a file using '''read function''', |
|- | |- | ||
| 00.51 | | 00.51 | ||
| − | | opening an existing file using mopen function and | + | | opening an existing file using '''mopen function''' and |
|- | |- | ||
| 00.55 | | 00.55 | ||
| − | | closing an already opened file using mclose function. | + | | closing an already opened file using '''mclose function'''. |
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|01.03 | |01.03 | ||
| − | |For this purpose the write() command is used. | + | |For this purpose the '''write()''' command is used. |
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| 01.15 | | 01.15 | ||
| − | || Type; | + | || Type; ''' random underscore matrix is equal to rand into bracket 20 comma 1 close the bracket semicolon and press enter''' |
| Line 109: | Line 109: | ||
|01.32 | |01.32 | ||
| − | || Type pwd | + | || Type '''pwd ''' |
| Line 116: | Line 116: | ||
|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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|01.47 | |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. |
| Line 136: | Line 136: | ||
|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. |
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| 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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| 02.55 | | 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'''. |
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| 03.23 | | 03.23 | ||
| − | | In this case random dash numbers dot txt, | + | | In this case '''random dash numbers dot txt''', |
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| 03.27 | | 03.27 | ||
| − | | And stores in the variable new underscore vector | + | | And stores in the variable '''new underscore vector''' |
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|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 quote random dash numbers dot txt comma 19 comma 1 ''' |
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| Line 218: | Line 218: | ||
| 03.56 | | 03.56 | ||
| − | |In this case random dash numbers dot txt | + | |In this case '''random dash numbers dot txt''' |
| Line 224: | Line 224: | ||
| 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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|04.12 | |04.12 | ||
| − | ||fd = mopen into bracket file-name comma mode | + | ||'''fd = mopen into bracket file-name comma mode''' |
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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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|05.59 | |05.59 | ||
| − | || Write Function | + | ||''' Write Function''' |
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| 06.00 | | 06.00 | ||
| − | | Read Function | + | | '''Read Function''' |
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| 06.02 | | 06.02 | ||
| − | | mopen | + | | '''mopen''' |
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| 06.03 | | 06.03 | ||
| − | | mclose | + | | '''mclose''' |
Revision as of 15:03, 7 March 2014
| 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 Linux12.04 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 summarises 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. |
