Subscripted assignment dimension mismatch error

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Alexandra Roxana 2021-10-22

评论： Alexandra Roxana 2021-10-23

I'm having this error and unfortunately I can't seem to see what's wrong in it. Here are the dimension of the variables:

ki=150, a=0, b=2, hx=0.1818, c=0, d=5, hy=0.3125, pi=150x1 double

Thank you in advance!

figure(1)
U(1:ki,1:ki)=pi;
[X,Y]=meshgrid(a:hx:b,c:hy:d);
surf(X,Y,U');

Dave B 2021-10-22

When you write:

U(1:ki,1:ki)=pi;

You're trying to put a 150x1 into a 150x150...Maybe what you intended was:

U(1:ki,1:ki)=repmat(pi,1,150);

It's a little unclear what you're after, but if you want to assign to a 150x150 you should probably give it a 150x150

Dave B 2021-10-22

You said you calculate pressure from u1, so I'm not sure what the surface is as pressure doesn't depend on u2...

U = repmat(pi,1,ki);

[X,Y] = meshgrid(linspace(a,b,ki),linspace(c,d,ki));

surf(X,Y,U');

For example:

u1=linspace(0,2*pi,100)';

u2=linspace(0,1,100)';

zi=sin(u1);

[u1i,u2i]=meshgrid(u1,u2);

surf(u1i,u2i,repmat(zi,1,numel(u1)))

If you want to form a matrix U out of various combinations of u1 and u2, I think you'll need interpolation (e.g. interp2 , scatteredinterpolant, griddedinterpolant)

Alexandra Roxana 2021-10-23

It's the first time I'm computing something like that, but at least I can see a graph. Thank you!

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