I'm generating matrices of different sizes to determine the effect of changing the step size on the accuracy of an iterative solution. I want to compare each matrix with an initial one that i know is accurate. Here is how i was planning to do it:
uCompare=interp2(xInitial,tInitial,uInitial,x,t,"cubic"); %make comparison matrix size equal to new matrix
error=mean(abs((uCompare-u) ./ uCompare)); %find mean % error between matrices
where xInitial and tInitial are the x and y values where the initial matrix uInitial is and x and t are the x and y values of the new matrix. xInitial is the same length as uInitial but 1 row and tInitial is the same height as uInitial but 1 column. The 2d interpolation gives this error:
Error using griddedInterpolant/parenReference
Query coordinates input arrays must have the same size.
Error in interp2 (line 156)
Vq = F(Xq,Yq);
Error in stepFind (line 28)
uCompare=interp2(xInitial,tInitial,uInitial,x,t,"cubic");
What is wrong with the data I'm inputting or is there a better way of achieving this?
