How to take a data form text file to put it in another file?

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Yamina chbak 2022-2-3

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https://ww2.mathworks.cn/matlabcentral/answers/1642345-how-to-take-a-data-form-text-file-to-put-it-in-another-file

评论： Yamina chbak 2022-2-4

Hi,
I have a text file called File.1.node which contain such as:
45 12 7 1 ( first line )
1 2 1 1
2 3 2 1
3 4 5 1
.....
% File.1.node is complete (last line )

I want to take the data from File.1.node without first line and last line, to put it in another file named Node.dat.
But How i write a code for this problem?
Thanks in advance.

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Star Strider 2022-2-3

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https://ww2.mathworks.cn/matlabcentral/answers/1642345-how-to-take-a-data-form-text-file-to-put-it-in-another-file#answer_888555

Try this —

fidi = fopen('File.1.node','rt');

F1c = textscan(fidi, '%f%f%f%f', 'HeaderLines',1, 'CollectOutput',1);

fclose(fidi);

F1 = cell2mat(F1c);

dlmwrite(F1, 'Node.dat')

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Star Strider 2022-2-4

@Stephen — Thank you.

The other answer was originally accepted, and I deleted my original (correct) answer as the result. I got an e-mail requesting that I re-post it so that it could be accepted. I did it from memory, and did not remember the correct argument order to dlmwrite (correct in my original answer) because I rarely used it even before writematrix appeared. (My original answer used readmatrix and writematrix, however A Achbak does not have access to them. The dlmwrite call appeared in a subsequent Comment.)

Yamina chbak 2022-2-4

Yes, I understand that now, well when I used dlmwrite (filename must be come first), it gives me a data but not form a matrix ( it was like : 1,2,1,1 2,3,2,1 .... ) So I prefer use @Stephen's code (removing the loop and the superfluous square brackets). Thanks you @Stephen.

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David Hill 2022-2-3

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https://ww2.mathworks.cn/matlabcentral/answers/1642345-how-to-take-a-data-form-text-file-to-put-it-in-another-file#answer_888250

在 MATLAB Online 中打开

See what readmatrix gives you

m=readmatrix('File.1.node.txt');
m(1,:)=[];
writematrix(m,'Node.dat');

If you do not attach the file, we cannot test.

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David Hill 2022-2-3

编辑：David Hill 2022-2-3

在 MATLAB Online 中打开

What about this?

m=dlmread('File.1.node',' ',[1 0 592 3]);

Yamina chbak 2022-2-3

编辑：Yamina chbak 2022-2-4

Yes It's working now ! it can read the first raw. Thanks you so much @David Hill.

But, i just checked that it gives me a wrong data, so i just say myself maybe my text file is not organize to know where is the raw and the colone o the matrix.

Thanks you again @David Hill.

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