FUNCTION integrate, array

; Integrate array and return results in iarray.
; Must check to make sure this is the exact reverse of the deriv function.
; Don't forget that to recover the original array from the derivitives,
; 	you have to add back in the starting value of the original array -
;	the constant of integration

a_size = n_elements(array)

iarray = array
iarray(0) = array(0)
for i = 1L,a_size-1 do begin
	iarray(i) = iarray(i-1) + array(i-1)
	endfor

return, iarray

end