[R] concise syntax for selecting multiple rows

[Erik Iverson]

See ?%in%

result$Subject %in% c("JEFF", "BG")

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")
> 
> 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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