[R] try catch block

[Martin Morgan]

ppatel3026 <pratik.patel at us.rothschild.com> writes:

> How can I use the try catch block such that if this statement fails 
> xml <- xmlTreeParse(xmlTxt, useInternal=TRUE)
>
> then this statement is executed
>
> xml <- xmlMalFormed()

library(XML)
xml <- 
    tryCatch({
        # other code, then...
        xmlTreeParse("sdf", useInternal=TRUE)
    }, error=function(err) {
        cat("err:", conditionMessage(err), "\n")
        ## etc
        "oops"
})
xml # "oops"

> ?

?tryCatch has examples.

> This code does not work but assuming its somewhere along these lines: 
> tryCatch(xml <- xmlTreeParse(xmlTxt, useInternal=TRUE), xml <-
> xmlMalFormed(f1))

Martin

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-- 
Martin Morgan
Computational Biology / Fred Hutchinson Cancer Research Center
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