i want to draw a streamline at 45 degree.

hello. i already plot the contour of stream function at a = 90 degree.

which like this.

[x,y]=meshgrid(0:0.1:1.0:0.1:1);
psi=y.*x;
figure;
contour(psi,100);

but, i just want to plot stream function at a = 45 degree, like image that i attached.

how should i do with matlab?

thank you.

Answer 1

[darova]

clc,clear

[t,r] = ndgrid(0:5:45,0:10);        % create mesh in polar coordinates
[x,y] = pol2cart(t*pi/180,r);       % convert to cartesian
z = x*0;
for i = 1:size(t,1)
    z(i,:) = r(i,:).^2*sind(t(i)/t(end)*180);
end
contour(x,y,z)

[jongil park]

oh god, thanks. i should try this.