[R] filter on data frame

[John Zhang]

Is this what you want?

> tt <- matrix(1:20, ncol = 4)
> tt
     [,1] [,2] [,3] [,4]
[1,]    1    6   11   16
[2,]    2    7   12   17
[3,]    3    8   13   18
[4,]    4    9   14   19
[5,]    5   10   15   20
> tt[tt[,1] < 3, ]
     [,1] [,2] [,3] [,4]
[1,]    1    6   11   16
[2,]    2    7   12   17


>To: r-help at stat.math.ethz.ch
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>X-Original-Date: Wed, 11 Dec 2002 19:28:28 +0100
>Date: Wed, 11 Dec 2002 19:28:28 +0100
>
>Hello R-list.
>Someone know how to delete  rows on a char/num matrix
>following some criteria without a loop (something like: my.matrix[my.matrix
>[,4]<1e-5],
>but this one put within rows, that follow citeria, "NA")?
> Thanks!
>
>A.S.
>
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