i want to draw a streamline at 45 degree.

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jongil park
jongil park 2021-4-1
评论： jongil park 2021-4-3
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.

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darova
darova 2021-4-2
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)

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