[R] basic array question
Uwe Ligges
ligges at statistik.uni-dortmund.de
Fri Jun 2 10:26:44 CEST 2006
Tim Alcon wrote:
> I have a large array and would like to extract from it the row and
> column indices just of values for which a particular boolean condition
Do you mean a matrix, i.e. exactly 2 dimensions?
> is true. I assume there's a simple way to do this, but I haven't
> figured it out yet. Any help would be appreciated.
Example:
X <- matrix(1:9, 3)
col(X)[X == 4]
row(X)[X == 4]
Uwe Ligges
> Tim
>
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