[R] Help with tryCatch

[William Dunlap]

Look at what sapply() is returning before you
assign it into zest[i].  If the return value has
length 0, set zest[i] to NA.  If it has length
more than 1, I don't know what you want to do.
If it has length 1 then do the assignment.

zest <- numeric(1)
tmp <- tryCatch(sapply(...), error=function()NA)
if (length(tmp)==1) {
   zest[i] <- tmp
} else if (length(tmp)==0) {
   zest[i] <- NA
} else {
   warning("length from sapply is ", length(tmp), ", what should I do?")
}

If zest is a list you may want to be using
zest[[i]] <- tryCatch(sapply(...)).

Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com  

> -----Original Message-----
> From: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org] On Behalf Of eric
> Sent: Sunday, July 10, 2011 12:38 PM
> To: r-help at r-project.org
> Subject: Re: [R] Help with tryCatch
> 
> I tried the following:
> 
> zest[i] <- tryCatch(sapply(getNodeSet(zdoc, "//zestimate/amount"),
> xmlValue), error=function() NA)
> 
> Here's what happens :
> 
> Error in zest[i] <- tryCatch(sapply(getNodeSet(zdoc, 
> "//zestimate/amount"), 
> : 
>   replacement has length zero
> 
> 
> 
> --
> View this message in context: 
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8113.html
> Sent from the R help mailing list archive at Nabble.com.
> 
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