Question
a.
if( any(x < 0) ) y <- log(1+x) else y <- log(x)
b.
if( any(x <= 0) ) y <- log(1+x) else y <- log(x)
c.
if( any(x >= 0) ) y <- log(1+x) else y <- log(x)
d.
if( any(x >> 0) ) x >- log(1+x) else x <- log(x)
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