On Apr 26, 2010, at 11:12 AM, John Sorkin wrote:
I would like to select rows if a row contains any one of several
values. I can do the selection as follows:
result[,"Subject"]=="JEFF" | result[,"Subject"]=="BG"
But this is very unwieldily if one wishes to select many, many rows
as one has to continuously repeat the source:
result[,"Subject"]=="JEFF" | result[,"Subject"]=="BG" |
result[,"Subject"]=="John" | result[,"Subject"]=="Mary"
Is there an easier way? I tried the following but it did not work:
result[,"Subject"]==c("JEFF" | "BG" | "John" | "Mary")
?%in%
To select rows the logical vector needs to be in the first position of
[ , ]
result[result$Subject %in% =c("JEFF" , "BG" , "John" , "Mary") , ]
--
David.
Thanks,
John
John David Sorkin M.D., Ph.D.
Chief, Biostatistics and Informatics
University of Maryland School of Medicine Division of Gerontology
Baltimore VA Medical Center
10 North Greene Street
GRECC (BT/18/GR)
Baltimore, MD 21201-1524
(Phone) 410-605-7119
(Fax) 410-605-7913 (Please call phone number above prior to faxing)
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David Winsemius, MD
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