[R] Output of row and column names

[(Ted Harding)]

On 22-Nov-05 Florian.Koller at gfk.de wrote:
> Dear all,
> 
> I am looking for a way to identify the row and column names of all
> elements
> within a matrix which fulfill some specified condition.
> 
> Example: I have a correlation matrix of the following form:
> 
>       Y1    Y2
> X1    0.4   0.3
> X2    0.6   0.1
> 
> Suppose, I want to know which elements are smaller than 0.2, so the
> desired
> output should be something like:
> 
> "X2 Y2"

The clue is the "arr.ind" parameter in 'which' (default=FALSE):

  > A
       [,1] [,2]
  [1,]  0.4  0.3
  [2,]  0.6  0.1

  > which(A<0.2, arr.ind=TRUE)
       row col
  [1,]   2   2

Best wishes,
Ted.


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Date: 22-Nov-05                                       Time: 12:03:45
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