[R] Help with tryCatch

[eric]

Having a hard time understanding the help files for tryCatch. Looking for a
little help with the following statement which sits inside a for loop

zest[i] <- tryCatch(sapply(getNodeSet(zdoc, "//zestimate/amount"),
xmlValue), error=function() zest[i] <-"NA")

zest is a numeric vector

If the sapply statement evaluates to an error, I'd like to set the value of
zest[i] to NA and continue with the loop.

Suggestions ?

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