[R] Using integrate

From: Ayman Oweida <ajoweida_at_yahoo.com>
Date: Mon, 21 Jul 2008 13:56:34 -0700 (PDT)

I have a function, say:
f<-function(x)  exp(x)

and I would like to obtain the integration of the function while adding a few operations within the integration (I need point-by-point integration), say:

t<-seq(0,40, by=1)
for (i in 1:40){
z[i] <- integrate ( f *  (t [i+1] - t)   ,  (i-1)  ,  i   )

In R, I can only have the function in 'integrate' i.e. 
z[i] <- integrate ( f  ,  (i-1)  ,  i   )

but I want to add additional operations within the 'integrate' command, which I cannot just add to the function f.

any input is appreciated.


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