Is there a way to sort text file in matlab?

I have a question if there is possibility to sort through text file in matlab. I'll post 3 pictures where it says all. I have a txt file and need to make nx3 matrix from it.

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This is first part where I have to delete first 11 rows in txt file.

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Second part where I have 3 columns of numbers I need to write in matrix

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Third part where I need to delete everything down from information I need to sort.

[Stephen23]

"Is there a way to sort text file in matlab?"

Yes.

Please upload a sample file. We cannot test code using screenshots of a text file.

[Matija Kosak]

Here and in main question added:)

Answer 1

[Stephen23]

>> str = fileread('kvadrat2.txt');
>> tkn = regexp(str,'^GRID\*\s+\d+\s+(\d+,\d+)\s+(\d+,\d+)\s+\d+\s+\*\s+\d+\s+(\d+,\d+)','lineanchors','tokens');
>> tkn = vertcat(tkn{:});
>> tkn = strrep(tkn,',','.');
>> mat = str2double(tkn)
mat =
         0   50.0000         0
         0   50.0000   50.0000
         0         0         0
         0         0   50.0000
         0    5.0000         0
         0   10.0000         0
         0   15.0000         0
         0   20.0000         0
         0   25.0000         0 
   ... lots of lines here
         0   20.0000   30.0000
         0   25.0000   30.0000
         0   30.0000   30.0000
         0   30.0000   25.0000
         0   30.0000   20.0000
         0   25.0000   20.0000
         0   25.0000   25.0000

To save the matrix in a new file use |csvwrite:

csvwrite('newfile.csv',mat)

If you really need to use a comma as the decimal radix, search this forum for "comma decimal".

[Matija Kosak]

Thank you a lot. You saved me. Just a question everything is working when I have positive values what about if I have some negative in there too. Example is attached. Thanks once again

[Stephen23]

@Matija Kosak: you will need to add an optional +/- sign to the regular expression, e.g.:

fmt = ['^GRID\*\s+\d+\s+([+-]?\d+,\d+)',... % 1st col.
    '\s+([+-]?\d+,\d+)\s+\d+',...           % 2nd col.
    '\s+\*\s+\d+\s+([+-]?\d+,\d+)'];        % 3rd col.
str = fileread('povrsina2_2.txt');
tkn = regexp(str,fmt,'lineanchors','tokens');
tkn = vertcat(tkn{:});
tkn = strrep(tkn,',','.');
mat = str2double(tkn)

Regular expressions are their own special language, I recommend that you read the documentation:

https://www.mathworks.com/help/matlab/matlab_prog/regular-expressions.html

You might also like to download my interactive regular expression tool, which lets you try different match strings and see all of regexp's outputs as you type:

https://www.mathworks.com/matlabcentral/fileexchange/48930-interactive-regular-expression-tool

[Matija Kosak]

Thank you a lot :)

[Stephen23]

@Matija Kosak: I hope that it helps. Remember to accept the answer that helped you most to resolve your question. Accepting answers is an easy way to show your appreciation of the volunteers who help you on this forum.

[Matija Kosak]

No problem, you helped me a lot.