-----Original Message-----
From: r-help-bounces at r-project.org
[mailto:r-help-bounces at r-project.org] On Behalf Of vpas
Sent: Monday, December 22, 2008 11:03 AM
To: r-help at r-project.org
Subject: [R] Matching
I understand this is an easy question, and have been playing
around with grep and the match function, but was hoping for a
little incite:
I have one .csv with the following data:
names values
A 1
B 2
C 3
D 4
The second .csv is:
names
A
C
I am hoping to match all of the rows that appear in the
second .csv, making a new file that would look like this:
names values
A 1
C 3
Here is what I have so far:
my.data <- read.csv("rows.csv",sep=",")
my.selection <- read.csv("select.csv",sep=",") matched <-
match(my.data[,1], my.selection[,1]) my.data <-
my.data[matched] write.table(as.matrix(my.data), "select_RESULTS.txt")
Unfortunately, this is throwing errors in row numbers...
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