matlab matrix to ascii with blank rows

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maurizio
maurizio el 14 de Feb. de 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 comentarios
Matt Tearle
Matt Tearle el 15 de Feb. de 2011
My question would be: why not just plot in MATLAB?
maurizio
maurizio el 16 de Feb. de 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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Oleg Komarov
Oleg Komarov el 14 de Feb. de 2011
Look at fprintf
Oleg

Más respuestas (2)

Igor
Igor el 14 de Feb. de 2011
better than fprintf :)
dlmwrite
  2 comentarios
Oleg Komarov
Oleg Komarov el 14 de Feb. de 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 el 14 de Feb. de 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 el 15 de Feb. de 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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