On Thu, 29 May 2008, Albert Vilella wrote:
Hi,
How can I use a substring match as a condition in a subset command?
Perhaps
subset(input, field1=="blah1" & regexpr("blah2",field3) != -1 )
??
Study in
example(gsub)
the regexpr example
and in
?gsub
the 'Value' section as it pertains to regexpr.
HTH,
Chuck
Sth like this:
subset(input, field1=="blah1" & field2=="blah2") # but now with substring
match in field2
subset(input, field1=="blah1" & field3 *substringmatch* "blah3")
I've tried with gsub, but it won't work:
subset(input, field1=="blah1" & gsub("blah3","",input$field3))
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