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))

        [[alternative HTML version deleted]]

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Charles C. Berry                            (858) 534-2098
                                            Dept of Family/Preventive Medicine
E mailto:[EMAIL PROTECTED]                  UC San Diego
http://famprevmed.ucsd.edu/faculty/cberry/  La Jolla, San Diego 92093-0901

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