Extract a MATLAB plot in a text file of points

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Sebsatien 2012-12-13

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Hi

I would like to ask for your help about extracting a 2D plot in Matlab into a text file containing an array of the plots points (x and y). What should I do excactly?

Thanks for the reply

Here's the figure. It's a simple sinusoidal curve along 1000 points.

I just one to extract the y values and the x values in a text file containing 2 arrays of points (x and y)

Thanks very much

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Jan 2012-12-13

编辑：Jan 2012-12-13

Please explain the available input exactly: what is "a 2D plot in Matlab"? A photo of the screen, a screenshot saved to a graphics file, a FIG file, an open Matlab figure, a diagram in a printed paper or PDF file?

Sebsatien 2012-12-14

The inputs are the sinusoidal fonction values (a current) as y and the time values as x. I want to get all the generated values of y in a column and the generated values of x in another column in a text file.

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Answer 1

Jan 2012-12-13

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It seems liek you do not have to extract the data from the figure, because you have constructed them directly. Then:

x = 1:length(I);
y = I;
fid = fopen('YourFileName.txt', 'w');
if fid == -1, error('Cannot open file for writing.'); end
fprintf(fid, '%g %g\n', transpose([x; y]));
fclose(fid);