2009/10/6 Uwe Ligges <[email protected]>:
>
> The first rule is easy: As long as you are using scalar valued (i.e. length
> 1 vectors in R) "cond", you should prefer
> if(cond) cons.expr else alt.expr
> rather than
> ifelse(cond, yes, no)
> because the latter one evaluates both "yes" and "no" while the former one
> evaluates exactly one of both expressions.
I don't think that that is true. The false leg was not evaluated here:
> ifelse(TRUE, { cat("a"); 1}, {cat("b"); 2})
a[1] 1
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