# Contour Plot from Coordinates

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Michael on 22 Apr 2013
Commented: Udit Srivastava on 10 Jan 2017
Right now I have a matrix with x-coordinates, matrix with y-coordinates, and a matrix with pressure values at these points. I'm trying to create a pressure contour plot based on the pressure values at these points, but I cannot seem to figure it out. Could anyone point me in the right direction of how to accomplish this? Any help would be much appreciated!

Kye Taylor on 22 Apr 2013
Edited: Kye Taylor on 22 Apr 2013
I will assume you have three vectors: x, y, and z (where z represents pressure). For example
x = rand(1,100);
y = rand(1,100);
z = x.^2 + y.^2;
Then, you can try
[xi, yi] = meshgrid(...
linspace(min(x),max(x)),...
linspace(min(y),max(y)));
zi = griddata(x,y,z, xi,yi);
contour(xi,yi,zi)
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Udit Srivastava on 10 Jan 2017
surely, this worked great. But the contour that I got looks like a quarter of a circle. Can you please tell me how to get a contour like a full circle. Thanks!