ARRANGING TEXT FILE?

Question

AHMET TATAR 2017-10-8

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评论： Cedric 2017-10-8

Hi,

I am working on a dynamic analysis. I am trying to run ANSYS on MATLAB. Therefore I have to change some value in my text file. Text file is large but i need to change e few line as follows;

 loadvari47rotz(2,1,1) = *0.174532925199433*    ??CHANGING_LINE-1
 loadvari47rotz(3,1,1) = *0.349065850398866*    ??CHANGING_LINE-2

I want to change above value for each step. Text file is at attachment and you can find changing lines CTRL+F "??CHANGING_LINE-1" and "??CHANGING_LINE-1".

I will be so happy if you help me.

Best Regards, Ahmet TATAR

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Answer 1

Cedric 2017-10-8

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编辑：Cedric 2017-10-8

在 MATLAB Online 中打开

Here is an example, and then we can tailor the solution to your needs from there:

 content = fileread( 'TEST.txt' ) ;
 content = regexprep( content, '(?<=_loadvari47rotz\(2,1,1\) = )\S+', sprintf( '%f', 0.123 )) ;
 content = regexprep( content, '(?<=_loadvari47rotz\(3,1,1\) = )\S+', sprintf( '%f', 0.456 )) ;
 fId = fopen( 'TEST_updated.txt', 'w' ) ;
 fwrite( fId, content ) ;
 fclose( fId ) ;

This can easily be updated for matching/replacing other parts, looping through files, etc.

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Walter Roberson 2017-10-8

To emphasize slightly: Cedric produces a new output file that has the right content, rather than changing the values "inside" the file. Updating a text file "in place" is only possible if the replacement text has exactly the same length as the original text. The update process is enough of a nuisance to do reliably that on the whole producing a new output file is easier and more reliable.

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