Is there any way to set options during the evaluation of a particular
expression, with them automatically reset when control leaves that
expression, however that happens? Kind of like "let" on a "special"
variable does in Lisp. I naively tried
with(options(warn=-1), {
fit <- fitdistr(data, 'weibull') # complains about NaNs
})
but this leaves options('warn') set to -1 afterward. I can save and
restore the value explicitly, but then if fitdistr() throws an error,
it won't get reset...
zw
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