Displaying 2 results from an estimated 2 matches for "cumdim".
2005 Jun 20
6
sweep() and recycling
Hi
I had a hard-to-find bug in some of my code the other day, which I
eventually
traced to my misusing of sweep().
I would expect sweep() to give
me a warning if the elements don't recycle nicely, but
X <- matrix(1:36,6,6)
sweep(X,1,1:5,"+")
[,1] [,2] [,3] [,4] [,5] [,6]
[1,] 2 9 16 23 30 32
[2,] 4 11 18 25 27 34
[3,] 6 13 20 22
2003 Jul 30
6
reverse array indexing
Hi,
Suppose I have a multidimensional array:
tmp <- array(1:8, c(2,2,2))
is there a function out there that, given a one-dimensional array index,
will
return the separate indices for each array dimension?
for instance, tmp[8] is equivalent to tmp[2,2,2]. I'd like to derive the
vector (2,2,2)
from the index 8.
thanks,
Brad Buchsbaum