How to create a matrix from plot and export into a csv file

Question

Manu Llamalo X 2013-10-30

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编辑： Marco 2013-10-30

Hi, I would like to create a matrix froma a plot and get the matrix to can export the plot into a csv file. I need the step between the funcion and plot and the matrix. >>x=linespace(-2,2,500) >>y=(x.^2).*(x<0)+1.*((0<x)&(x<1))+(-x+2).*(1<=x) >>plot(x,y,'r-'); >> THIS IS THE STEP THAT I NEED >>csvwrite('filename.csv',M)

M is the matrix,and I need to get it into the csv, so Can I get the y=f(x) to a matrix?

Thanks, Have a nice day.

Manu.

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Answer 1

Honglei Chen 2013-10-30

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Do you mean something like this?

M = [get(gca,'XData') get(gca,'YData')]

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Answer 2

Marco 2013-10-30

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编辑：Marco 2013-10-30

在 MATLAB Online 中打开

You might want to use the function FPLOT. Taken from the FPLOT documentation:

    [X,Y] = fplot(fun,limits,...) returns the abscissas and ordinates for fun in X and Y.

Or you might want to use the function FEVAL for enhanced control on what range is going to be calculated. The use of teh FEVAL function was suggested to me here by Jonathan LeSage in his answer to a FPLOT related question of mine.