Hi
r-help-boun...@r-project.org napsal dne 28.01.2010 06:21:40:
>
> i have a simple question. If i have a 2x2 matrix with [,1] and [,2] i
want to
> test each of these to see if they are below some number. If each
component
> in column is below the number then it returns a 1. Now from this result
I
> would like to add the number of 1's that came up. How can i do this?
Something like that?
mat <- matrix(rnorm(4),2,2)
mat
[,1] [,2]
[1,] -0.08882795 0.0567098
[2,] 0.13091031 -0.1269901
mat<0
[,1] [,2]
[1,] TRUE FALSE
[2,] FALSE TRUE
colSums(mat<0)
[1] 1 1
Regards
Petr
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