Hello,
To that effect, just use the argument arr.ind of ?which:
which(grid == median(grid), arr.ind = TRUE)
Note that it defaults to FALSE.
Hope this helps,
Rui Barradas
Em 11-05-2013 23:35, Tom Roche escreveu:
Is there a function 'foo' such that, given an array and a value, iff
the value is present in the array, it returns the index(s) of the
value? E.g.,
matrix(1:9, nrow=3) -> grid
grid
[,1] [,2] [,3]
[1,] 1 4 7
[2,] 2 5 8
[3,] 3 6 9
foo(grid, median(grid))
[1] c(2,2)
I'm sure I could code this with nested loops, but am nearly as sure
that this functionality must already exist in R ... since there's so
much functionality already in R !-)
Apologies if this is a FAQ, but a fair amount of googling via
rseek.org is not finding an answer (probably because I'm not using the
correct search terms). Feel free (in fact, be encouraged :-) to reply
directly to me as well as to the list (I'm on the digest, which gets
huge).
TIA, Tom Roche <tom_ro...@pobox.com>
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