[R] Combining logical operators to extract columns from a dataframe

From: <mtb954_at_gmail.com>
Date: Tue, 25 Mar 2008 16:57:22 -0600

Hi R-helpers,

I have a dataframe (called data) with 100 columns, the columns of which are named with integers ranging from 1900 to 1999.

I wish to extract those columns which names are >=1950 and <=1970.

I tried:

data2<-subset(data,select=(names(data)>=1950 & names(data)<=1970))

but that doesn't work.

Any ideas?

Thanks! Mark

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