trapz whe x is a matrix

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Jose Costa
Jose Costa 2019-11-19
评论： dpb 2019-11-22
I have a Y matrix size 2500x11 were each line corresponds to the 11 vales of curve points for trapezoidal integration.
the x values are not uniform and they vary so i have a second matrix for X size 2500x11.
I' tring to integrate using trapz (X,Y,2) but I get error "X must be a vector.".
How ca one use trapz with a matrix for x values? In octave it works.

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dpb
dpb 2019-11-19
TMW only implemented variable X spacing for the full array, not by column (or row). Have to loop to do it...worthy of an enhancement request for the added functionality it would seem.
N=size(Y,1);
for i=1:N
Q(i)=trapz(X(:,i),Y(:,i));
end
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dpb
dpb 2019-11-22
MATLAB is not Octave! Converse is also true... :)
Feel free to submit the enhancement request...I'd suggest referencing this thread if do so.

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