[R] Matrix elements

[Gabor Grothendieck]

Try this:

which(xx[,1] > 0 & xx[,2] > 0)


On 3/26/06, Akkineni,Vasundhara <vasu.akkineni at louisville.edu> wrote:
> Hello all,
>
> I have a matrix object, xx given as below:
>
>             [,1]         [,2]
>  [1,]  0.02237883  0.601572660
>  [2,] -0.39880918  0.126498958
>  [3,]  0.20269214  0.567953402
>  [4,] -0.45750812 -0.031193600
>  [5,] -0.30666134 -0.084819484
>  [6,] -0.37718928  0.078675868
>  [7,] -0.25432685 -0.005200316
>  [8,] -0.22146224  0.168196438
>  [9,] -0.32049919 -0.013216047
> [10,]  0.94325749  1.341664313
>
> How can i check for every row in the matrix that both the column elements are greater than zero, and if they are greater than zero then to print the row number. I tried using for loops, but it kept returning warnings. Please let me know how this can be done.
>
> Thanks,
> Vasu.
>
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