matlab matrix to ascii with blank rows

Question

maurizio 2011-2-14

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https://ww2.mathworks.cn/matlabcentral/answers/1314-matlab-matrix-to-ascii-with-blank-rows

Hello,

I'm trying to export a matrix to ascii file, to then plot it using GNUPLOT. To plot a surface, I would need a matrix with blank rows in it, something like:

A(1) B(1) C(1, 1)
A(1) B(2) C(1, 2)
A(1) B(3) C(1, 3)
A(2) B(1) C(2, 1)
A(2) B(2) C(2, 2)
A(2) B(3) C(2, 3)

but I can't find any documentation about it.

Any idea?

Thanks in advance

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Matt Tearle 2011-2-15

My question would be: why not just plot in MATLAB?

maurizio 2011-2-16

Because when I'm going to start writing the PhD thesis, I will include a lot of plots (Letx -> eps) and everytime I used Matlab there was always something I had to fix with CorelDraw. I love Matlab but I've never been 100% satisfied with its plotting capability. Do not get me wrong, it's more than enough to visualize data, but as I sayd I've alaways had to modified the exported eps with another software to reach a publishable quality.

Third, I'm very curious by nature and due to the fact that I will produce a lot of plots in the next months, I think it's a good chance to learn something more about GNUPLOT.

Thanks for your question, bye

Maurizio

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Answer 1

Oleg Komarov 2011-2-14

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Look at fprintf

Oleg

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Answer 2

Igor 2011-2-14

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better than fprintf :)

dlmwrite

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Oleg Komarov 2011-2-14

You can't use dlmwrite if the OP is actually trying to write A(1,1) and not the element itself ata that position.

And easier to use maybe, don't know about better.

Walter Roberson 2011-2-14

And you aren't going to get the blank lines in dlmwrite() unless you loop using the row offset and the -append option. fprintf() would be easier.

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Answer 3

maurizio 2011-2-15

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https://ww2.mathworks.cn/matlabcentral/answers/1314-matlab-matrix-to-ascii-with-blank-rows#answer_2008

在 MATLAB Online 中打开

Thnks, fprint works perfectly:

A = [1 2 3 4 5;
  5 4 3 2 1;
  1 2 3 4 5];
B = [10 20 30 40 50];
t = [10 20 30];
for l = 1:length(t)
    for m = 1:length(B)
        C(m,1) = t(l);
        C(m,2) = B(m);
        C(m,3)  = A(l,m);
      fid = fopen('PlotVariable.dat', 'a');
      fprintf(fid, '%5.3f %5.3f %5.3f \n', C(m,1:3));
      fclose(fid)
      end
      fid = fopen('VarToPlot.dat', 'a');
      fprintf(fid, '\n');
      fclose(fid)
    end