[R] Extract specific rows from a data frame

[arun]

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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