getting error in contour plot

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Narayan Das Ahirwar
回答： Star Strider 2019-11-4
z = psi(1:ny,1:nx);
X = linspace(0,1, size(z,2));
Y = linspace(0,1,size(z,1));
contour(X,Y)
when i run my program code " i'm getting an error of z matrix must be 2*2 matrix"
but my z function is 51*51 matrix .So what is the error in code.
  1 个评论
Bhaskar R
Bhaskar R 2019-11-4
Function psi is allowed only scalar value as first argument.
See the help https://in.mathworks.com/help/matlab/ref/psi.html
ny, nx values are not provided

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回答（1 个）

Star Strider
Star Strider 2019-11-4
Try this:
nx = 50;
ny = 50;
z = psi((1:ny)'*(1:nx));
X = linspace(0,1, size(z,2));
Y = linspace(0,1,size(z,1));
contour(X,Y,z)
The argument to psi may be a matrix (note the column*row vector multiplication to create the psi argument matrix), and the ‘Z’ argument to contour must be a matrix.
Experiment to get different results.

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