I just want to integrate a 3D data set along one dimension to obtain a
2D data set.  Something like:

 

(given array "d" with dim nx,ny,nz ...)

 

data_int<-array(dim=c(nx,ny))

for (n in 1:ny) {

  for (m in 1:nx) {

     data_int[m,n]<-sum(d[m,n,])

  }

}

 

The thing is, given R's facility with integers, it seems that I should
be able to obtain data_int without the explicit for-loops, but I haven't
been able to figure out how to do it.  Anyone know how?  Thanks.


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