Using countourf for 1D vectors

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Güinther SAIBRO
Güinther SAIBRO 2017-9-14
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.
  1 个评论
KSSV
KSSV 2017-9-15
Show us the code you have for x,y and z....it can be sorted..

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回答（1 个）

Akira Agata
Akira Agata 2017-9-15
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;

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