Contourf Z must be at least a 2x2 matrix error

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mehtap agirsoy
mehtap agirsoy 2021-8-23
回答： Walter Roberson 2021-8-23
Hi all,while creating contourf plot I have Z must be at least a 2x2 matrix.I couldn't fix it. If you've any idea to fix it I'd be appreciate.Thanks in advance.
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KSSV
KSSV 2021-8-23
Unrecognized function or variable 'SPODpost'.
Error in Rainbow_POD (line 26)
mode = SPODpost(a(:,1:idx));

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Walter Roberson
Walter Roberson 2021-8-23
mode = SPODpost(a(:,1:idx));
That function was not included
contourf(X,Y,Vi(:,:,mode(idx).ind(2)),10,'edgecolor','none')
For that to be valid, Vi(:,:,mode(idx).ind(2)) must be a 2D array. But...
>> whos -file POD.mat
Name Size Bytes Class Attributes
U 1x101 808 double
V 1x101 808 double
X 1x101 808 double
Y 1x101 808 double
and
% Ui,Vi,Wi,... :POD modes (spatial modes). Number of output modes depends
% on the number input velocity components. The dimension of
% the output data is the same as the input data, whereas the
% last dimension contains individual modes instead of
% snapshots.
The input V is a vector, and with the output Vi being the same size as the inputs, that means that Vi must be a vector.
Your plotting code with contourf() assumes that Vi is 3 dimensional, but it is only a vector.
You will not be able to do contouring in this situation.

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