Extract specific rows from a data frame

Hi,
May be this helps:
df1<- read.table(text="
? t1 t2 t3 t4
? len1 AA AA PP AP
? len2 FALSE AA PP MM
? len3 PP AA AA AP
? len4 PP AM MP PP
? len5 AA FALSE AP PP
? len6 PP AA AA AA
",sep="",header=TRUE,stringsAsFactors=FALSE)

df1[df1[,1]=="PP" & (rowSums(df1[,-1]!="PP")==(ncol(df1)-1)),]
#???? t1 t2 t3 t4
#len3 PP AA AA AP
#len6 PP AA AA AA
A.K.



----- Original Message -----
From: Chirag Gupta <cxg040 at email.uark.edu>
To: r-help at r-project.org
Cc: 
Sent: Saturday, July 20, 2013 6:56 PM
Subject: [R] Extract specific rows from a data frame

Hi

I have a data frame as below



? t1 t1 t3 t4? len1 AA AA PP AP? len2 FALSE AA PP MM? len3 PP AA AA AP? len4
PP AM MP PP? len5 AA FALSE AP PP? len6 PP AA AA AA
I am having trouble extracting only those rows which have "PP" in the first
column but AA or FALSE or all any other value but not PP in rest of the
columns.

*Chirag Gupta*

??? [[alternative HTML version deleted]]

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