On Wed, Sep 19, 2012 at 12:56 PM, David Winsemius
<dwinsem...@comcast.net> wrote:
> Basically you run you each iteration of your code inside try() and then test
> to see if it's class vector includes "try-error", ... then you can do
> something with the result or return NA. This may makeit more useful because I
> return the results at each iteration if there was no error:
>
> sapply(test, function(x) if( "try-error" %in% class(try( Z <-
> exp(test[test[x:1]] ) ) ) ){NA}else{Z} )
>
>
I think it's easier to use tryCatch(), eg
sample.size <- tryCatch(
power.t.test(delta=14.02528,sd=1.945226,power=0.8,sig.level=0.05)$n,
error=function(e) NA
)
The first line gets run, and if there's an error, the error is passed
to the error= argument. This is a function that takes the error as an
argument, and could do sophisticated things with it, but actually just
returns NA for all errors.
tryCatch() is also quieter.
-thomas
--
Thomas Lumley
Professor of Biostatistics
University of Auckland
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