Using countourf for 1D vectors

Question

Güinther SAIBRO 2017-9-14

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https://ww2.mathworks.cn/matlabcentral/answers/356743-using-countourf-for-1d-vectors

评论： Güinther SAIBRO 2017-9-19

Hi.

I have 3 unidimensional vectors like: x=[x1,x2,x3,...]; y=[y1,y2,y3,...] and z=[z1,z2,z3,...]. z is a function of x and y, and I have a pair x/y for each z value z1=f(x1,y1).

If a try to use contourf, I need a matrix and I get a lot of NaN elements, with these NaN I cant't reach a good visualization of my signal.

Would you have some solution to display some level courbes with just the vectors?

Thank you.

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KSSV 2017-9-15

Show us the code you have for x,y and z....it can be sorted..

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Answer 1

Akira Agata 2017-9-15

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https://ww2.mathworks.cn/matlabcentral/answers/356743-using-countourf-for-1d-vectors#answer_281644

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By using meshgrid and griddata, you can create contour from 3 unidimensional vectors, like:

% 1D data
x = randn(1,400);
y = randn(1,400);
z = x.*exp(-x.^2-y.^2)
% Interpolate for x-y grid
[xq,yq] = meshgrid(-2:.2:2, -2:.2:2);
zq = griddata(x,y,z,xq,yq);
% Visualize the result
figure
contourf(xq,yq,zq);
colorbar;