Re: [R] How to match some patterns in a matrix

From: Bert Gunter <gunter.berton_at_gene.com>
Date: Fri, 11 Apr 2008 11:49:30 -0700

  1. Strictly speaking, y is a one-column matrix if it has a non-null dim attribute (it also is a vector).
  2. ?match or ?"%in%" tells you what to do.

x2[x2[["name"]] %in% y,]

is what you want.

-----Original Message-----
From: r-help-bounces_at_r-project.org [mailto:r-help-bounces_at_r-project.org] On Behalf Of ss
Sent: Friday, April 11, 2008 11:23 AM
To: r-help_at_r-project.org
Subject: [R] How to match some patterns in a matrix

Dear all,

I have a data frame called x2, which looks like:

> dim(x2)

[1] 2237 2
> x2[1:4,1:2]

    name                       id
1 STye                      hggd3
2 STy2                      bffbd2
3 qw22e                    bdbdbbbd7
4 deffrdff                    nnshfd3

and a vector called y, which looks like:

> dim(y)

[1] 135 1
> y[1:3,1]
[1] ABCDE BDH5 DESRP1 y is a subset of x2$name and I want to select the rows in x2 whose 'name' match
y. Is there an easy way to do so?

I tried subset(x2, y) but it did not work.

Thanks much for your advice.

Alex

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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Fri 11 Apr 2008 - 18:52:01 GMT

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