Is there a recommended or "good" way to check if the evaluation of an
expression returns an error?
e.g.
var(NA)
I wish var(NA) to return NA or "err", or some other value, even a
text-string, but not an error message.
I am using a loop to load many samples of data and to perform analysis on
each sample. On occasion, the function I execute returns an error message.
(e.g. when all data is NA, etc). I wish for the loop to continue to execute,
and to have the function return an NA or NULL rather then an error message.
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