Contour plot using meshgrid
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[x,y] = meshgrid(-5:0.1:5,-5:0.1:5);
r = sqrt(x.^2+y.^2);
theta = atan(y/x);
gamma = 2;
B = 2;
u = 1;
psi = u.*r.*sin(theta)-B./r.*sin(theta)-gamma/(2*pi).*log(r);
contour(x,y,psi)
When i run this, the plot is not showing the psi-function. How can that be? What do I have to change?
I get the following warnings:
Line 3: Matrix is singular to working precision
Line 8: Contour is not rendered for non-finite Zdata
采纳的回答
[x,y] = meshgrid(-5:0.1:5,-5:0.1:5);
r = sqrt(x.^2+y.^2);
theta = atan2(y, x);
gamma = 2;
B = 2;
u = 1;
psi = u.*r.*sin(theta)-B./r.*sin(theta)-gamma/(2*pi).*log(r);
contour(x,y,psi)
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