problem using trapz function

can someone help me figure out how to use the trapz function to find the area under the curve for a graph of for example Y=[1 3 5 9 15] versus t =[0 14 28 35 42] respectively? over the time intervals 0-14,14-28,28-35,35-42. to clarify i'm wondering how one specifies in the trapz funtion to take the area under the curve of a matrix over variable intervals. I've tried trapz(t,Y) but it doesn't work. any help would be greatly appreciated.

Answer 1

[Star Strider]

See if the cumtrapz function does what you want:

z = cumtrapz(t,Y)

It takes the cumulative integrals over each ‘t’ interval.

[Al Thr]

it didn't change anything. got any other ideas?

[Star Strider]

I have no idea what you want.

Try this:

zx = diff(z)