| Library: | xplore |
| See also: | prod prodex |
| Quantlet: | cumprodex | |
| Description: | an extended form of the cumprod function - NaN and all values contained in excl are excluded from computation |
| Usage: | cprodx = cumprodex(x{, excl {, s}}) | |
| Input: | ||
| x | d1 x d2 x .. x dn array, n <= 7 | |
| excl | a matrix containing values to be excluded | |
| s | integer (number of dimension, default = 1) | |
| Output: | ||
| cprodx | d1 x d2 x .. x d(j-1) x 1 x d(j+1) x .. x dn array | |
library("xplore")
randomize(666)
x = rint(10 * uniform(5, 4))
x[2,1] = NaN
x
excl = #(2,4)
cumprodex(x,excl)
Contents of x [1,] 3 9 5 3 [2,] +NAN 4 2 6 [3,] 1 2 7 8 [4,] 9 5 5 1 [5,] 7 1 3 5 Contents of cprodx [1,] 3 9 5 3 [2,] +NAN -NAN -NAN 18 [3,] 3 -NAN 35 144 [4,] 27 45 175 144 [5,] 189 45 525 720