[R] How to say "if error"

Paul Chatfield p.s.chatfield at reading.ac.uk
Thu Jun 24 17:12:15 CEST 2010

On a similar issue, how can you detect a warning in a loop - e.g. the
following gives a warning, so I'd like to set up code to recognise that and
then carry on in a loop

ff<-glm(y/23~x, family=binomial)

so this would be incorporated into a loop that might be

for (i in 1:10)
{ee<-glm(y~x, family=binomial)
ff<-glm(y/23~x, family=binomial)}

from which I would recognise the warning in ff and not those in ee, saving
results from ee and not from ff. The last bit would be easy adding a line
if(there_is_a_warning_message) {newvector<-NA} else {use results} but how do
you detect the warning message?

Thanks all for your feedback so far,

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