problem using trapz function

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Al Thr
Al Thr 2017-4-28
评论： Star Strider 2017-4-28
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.

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回答（1 个）

Star Strider
Star Strider 2017-4-28
See if the cumtrapz function does what you want:
z = cumtrapz(t,Y)
It takes the cumulative integrals over each ‘t’ interval.
  2 个评论
Al Thr
Al Thr 2017-4-28
it didn't change anything. got any other ideas?
Star Strider
Star Strider 2017-4-28
I have no idea what you want.
Try this:
zx = diff(z)

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