[R] Help wit matrices

[John Kane]

Will something like this help?

mm <- matrix(rnorm(100),nrow=10)
mm
nn  <-  mm  >.5
nn

--- Lanre Okusanya <lanre.okusanya at gmail.com> wrote:

> Hello all,
> 
> I am working with a 1000x1000 matrix, and I would
> like to return a
> 1000x1000 matrix that tells me which value in the
> matrix is greater
> than a theshold value (1 or 0 indicator).
> i have tried
>   mat2<-as.matrix(as.numeric(mat1>0.25))
> but that returns a 1:100000 matrix.
> I have also tried for loops, but they are grossly
> inefficient.
> 
> THanks for all your help in advance.
> 
> Lanre
> 
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