Hi:
> z = matrix(rnorm(n*m),n,m,dimnames =list(rnames,cnames))
> z
x1 x2 x3 x4 x5
1 -0.3942900 -0.61202639 -1.804958629 -0.1351786 -1.27659221
2 -0.0593134 0.34111969 1.465554862 1.1780870 -0.57326541
3 1.1000254 -1.12936310 0.153253338 -1.5235668 -1.22461261
4 0.7631757 1.43302370 2.172611670 0.5939462 -0.47340064
5 -0.1645236 1.98039990 0.475509529 0.3329504 -0.62036668
6 -0.2533617 -0.36722148 -0.709946431 1.0630998 0.04211587
7 0.6969634 -1.04413463 0.610726353 -0.3041839 -0.91092165
8 0.5566632 0.56971963 -0.934097632 0.3700188 0.15802877
9 -0.6887557 -0.13505460 -1.253633400 0.2670988 -0.65458464
10 -0.7074952 2.40161776 0.291446236 -0.5425200 1.76728727
11 0.3645820 -0.03924000 -0.443291873 1.2078678 0.71670748
12 0.7685329 0.68973936 0.001105352 1.1604026 0.91017423
13 -0.1123462 0.02800216 0.074341324 0.7002136 0.38418536
14 0.8811077 -0.74327321 -0.589520946 1.5868335 1.68217608
15 0.3981059 0.18879230 -0.568668733 0.5584864 -0.63573645
> z[z[, 1] < 0, ]
x1 x2 x3 x4 x5
1 -0.3942900 -0.61202639 -1.80495863 -0.1351786 -1.27659221
2 -0.0593134 0.34111969 1.46555486 1.1780870 -0.57326541
5 -0.1645236 1.98039990 0.47550953 0.3329504 -0.62036668
6 -0.2533617 -0.36722148 -0.70994643 1.0630998 0.04211587
9 -0.6887557 -0.13505460 -1.25363340 0.2670988 -0.65458464
10 -0.7074952 2.40161776 0.29144624 -0.5425200 1.76728727
13 -0.1123462 0.02800216 0.07434132 0.7002136 0.38418536
Is this what you were looking for?
HTH,
Dennis
On Tue, Feb 9, 2010 at 12:12 PM, DonDiego <jorge.nie...@moorecap.com> wrote:
>
> Hi,
>
> I have a matrix of data values like the example bellow. I would like to
> extract a subset of the matrix for the values where the first column is
> negative. I am using the subset function. However, I am getting an error
> message that the conditional variable doe snot exist. For some reason, the
> subset operation only works if I transform the matrix to a data set using
> as.data.set(). The help indicates that the subset function can be applied
> to
> matrixes and data sets. I am wondering if anyone has seen a similar problem
> before. am I using the correct syntax?
>
>
>
> n = 15
> m = 5
>
> cnames = paste("x",1:m,sep="")
> rnames = 1:n
>
> z = matrix(rnorm(n*m),n,m,dimnames =list(rnames,cnames))
>
>
> Thanks,
>
> Jorge
>
>
>
>
> test = subset(z,x1 < 0, select = c(cnames))
>
> --
> View this message in context:
> http://n4.nabble.com/subset-in-a-matrix-tp1474958p1474958.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help@r-project.org mailing list
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> PLEASE do read the posting guide
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> and provide commented, minimal, self-contained, reproducible code.
>
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