[R] Odp: If then test

[Petr PIKAL]

Hi

r-help-bounces at 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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