[a,b] = meshgrid(-0.1:.2:1.6,-0.1:.2:2.5);z=((2*(b.^2).*(1-a-b)/(1-(b.^2))).^0.5);MATLAB: Warning: Rank deficient, rank = 1, tol = 4.8961e-014. Could someone please help me fix this? My body message has code I used.
rank = 1rank deficienttol = 4.8961e-014.warning
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When dealing with arrays, unless you specifically intend too do matrix operations, always use element-wise operations (the dot operator).
Try this:
w3=0:0.1:5;t=0:0.01:5;w=107.36; d=150; x=410;[a,b]=meshgrid(w3,t);z=abs((4.22E-3)*(a.^2)./((w.^2)-(a.^2))).*sin((pi*d)/820).*sin((pi*x)/820).*sin(a.*b);figuresurf(a,b,z, 'EdgeColor','none')producing:
Also, eliminating the edge line color makes the patch faces visible.
Sounds like you have inconsistent equations. The A\B calculation is doing the best that it can under these circumstances. E.g.,
>> A = [1 2 3;2 4 6] % <-- 2nd row is 2*1st row, so rank deficient
A = 1 2 3 2 4 6>> B = [1;2] % <-- this particular B is consistent with both rows of A
B = 1 2>> x = A\BWarning: Rank deficient, rank = 1, tol = 4.4686e-015. x = 0 0 0.3333>> A*x % <-- works because equations are consistent
ans = 1 2>> >> B = [1;3] % <-- this particular B is not consistent with the rows of A
B = 1 3>> x = A\BWarning: Rank deficient, rank = 1, tol = 4.4686e-015. x = 0 0 0.4667>> A*x % <-- does not work because of the inconsistency. This is the best that backslash can do
ans = 1.4000 2.8000How are your A and B variables being calculated?
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