How to integrate using trapz function

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.

Int=trapz(X1,Y);

Answer 1

[Bjorn Gustavsson]

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);

HTH

[shagun chaudhary]

Thank you so much

[shagun chaudhary]

Hi,

How should i write if I have one row of X1 value (1X525595) as shown above but Y row consist of (56X525595). I need int (trapz) for all the 56 combination. Please can you help on this.

[shagun chaudhary]

How to get Trapz for all 56 combination. This is what ineed. Thanks

[Bjorn Gustavsson]

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);