How to integrate using trapz function

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Hi I am using trapz to get my answer. but i am getting 0 which is not the answer. I have attched my data where Y reprsesnt loads (mg/hr) and x represents time in a number form . Please i will extremely graeful if somebody can help.

Accepted Answer

Bjorn Gustavsson
Bjorn Gustavsson on 31 Aug 2022
The variable in X1 seems awfully constant, at 0.0166. The first input to trapz should be the x-coordinate of the points at which you have Y, not the values of "dx". Perhaps what you want is something like:
Ival = trapz(cumsum(X1),Y);
Bjorn Gustavsson
Bjorn Gustavsson on 31 Aug 2022
If you look at the help for trapz you will read:
Z = trapz(X,Y,DIM) or trapz(Y,DIM) integrates across dimension DIM
of Y. The length of X must be the same as size(Y,DIM)).
That means that your call to trapz would be something like:
z_all = trapz(cumsum(X1),Y,2);

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