getting error in contour plot

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.

[Bhaskar R]

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

Answer 1

[Star Strider]

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.