On Mon, 10 Nov 2008, Dieter Menne wrote:
Kurapati, Ravichandra (Ravichandra <ravichandra.kurapati <at> alcatel-lucent.com> writes:> df Session_Setup DCT FwdDataVols_bin counts 761 0 1 1 87162 Subset(df,df$ FwdDataVols_bin>30 && df$ FwdDataVols_bin<100 ) but it doesn't workThere is a subtle difference between && and &. If I am in doubt, I first make and isolated printout of the logical selection vector df=data.frame(FwdDataVols=100+rnorm(10)*100) df$FwdDataVols>10 && df$FwdDataVols<100 # gives FALSE df$FwdDataVols>10 & df$FwdDataVols<100 # gives FALSE TRUE FALSE..... subset(df,df$FwdDataVols>10 & df$FwdDataVols<100)
And for clarity subset(df, (FwdDataVols > 10) & (FwdDataVols < 100) ) as it looks first in 'df'.
# Probably more usual, but maybe more difficult to understand df[df$FwdDataVols>10 & df$FwdDataVols<100,] Dieter ______________________________________________ R-help@r-project.org mailing list 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.
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