I think you just missed some commas out...
aar <-
function(command = c("scrn", "dx", "df"))
{
command <- match.arg(command)
switch(command,
scrn = cat("scrn :Screening","\n"),
dx = cat("dx :Diagnosis","\n"),
df = cat("df :Don't Forget","\n")
)
}
Colin.
Ps you don't need the curly brackets here if theres only one expresion,
and sometimes its good to restrict the inputs to only those you want
So that
aar("something wrong")
# Error in match.arg(command) : 'arg' should be one of "scrn", "dx",
"df"
-----Original Message-----
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org]
On Behalf Of oscar linares
Sent: 18 November 2009 10:40
To: r-help@r-project.org
Subject: [R] Switch Help
Dear Rexperts,
Given,
aar <-function(command) {
switch(command,
{scrn = cat("scrn :Screening","\n")}
{dx = cat("dx :Diagnosis","\n")}
{df = cat("df :Don't Forget","\n")}
)
}
I want to be able to do:
aar("dx") # function does cat("dx :Diagnosis","\n")
aar(c("dx","df")) # function does cat("dx :Diagnosis","\n")
# function does df = cat("df :Don't
Forget","\n")
BUT IT IS NOT WORKING FOR ME.
Please help:-)
--
Oscar
Oscar A. Linares, MD
Translational Medicine Unit
LaPlaisance Bay, Bolles Harbor
Monroe, Michigan
[[alternative HTML version deleted]]
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