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matlab matrix to ascii with blank rows

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maurizio
maurizio on 14 Feb 2011
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

  3 Comments

Paulo Silva
Paulo Silva on 14 Feb 2011
You can't have blank elements in a matrix, use cell instead.
Matt Tearle
Matt Tearle on 15 Feb 2011
My question would be: why not just plot in MATLAB?
maurizio
maurizio on 16 Feb 2011
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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Accepted Answer

Oleg Komarov
Oleg Komarov on 14 Feb 2011
Look at fprintf
Oleg

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More Answers (2)

Igor
Igor on 14 Feb 2011
better than fprintf :)
dlmwrite

  2 Comments

Oleg Komarov
Oleg Komarov on 14 Feb 2011
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
Walter Roberson on 14 Feb 2011
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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maurizio
maurizio on 15 Feb 2011
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
thanks again
Maurizio

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