Matching row names was the request.
# continuing with your example:
rownames(d1)<- letters[1:5]
rownames(d2)<- letters[3:7]
# and then for rownames of d1 that are also in rownames of d2:
# for the full rows ...
d1[row.names(d1) %in% row.names(d2),]
# or for just the names:
rownames(d1)[row.names(d1) %in% row.names(d2)]
--
David Winsemius
On Dec 11, 2008, at 4:21 PM, Daniel Malter wrote:
Hi
#Create data and data frames
x=rnorm(5,0,1)
y=rnorm(5,0,1)
z=rnorm(5,0,1)
d1=data.frame(x,y)
d2=data.frame(y,z)
#which variable name in d2 is a variable name in d1?
names(d2[names(d2)%in%names(d1)]) # it's y
#give me the columns of d2 that have variable names
#that are also variable names in d1
d2[names(d2)==names(d2[names(d2)%in%names(d1)])]
#check
d2$y
Cheers,
Daniel
-------------------------
cuncta stricte discussurus
-------------------------
-----Ursprüngliche Nachricht-----
Von: r-help-boun...@r-project.org [mailto:r-help-boun...@r-
project.org] Im
Auftrag von Wade Wall
Gesendet: Thursday, December 11, 2008 3:59 PM
An: r-h...@stat.math.ethz.ch
Betreff: [R] Extract rows from data frame based on row names from
anotherdata frame
Hi all,
Is there a function to extract row names from a data frame based on
row
names from another data frame? I can write a loop function to do
this, but
this may be inefficient in terms of processing.
thanks for any information,
Wade
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and provide commented, minimal, self-contained, reproducible code.
______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
