Re: loops vs vectorization

[Robert A.Macy]

Would somebody be kind enough to refresh my memory how to
avoid a "for" loop when there are a lot of conditional
adjustments going on?

for example, the simple act of replacing every item that is
less than negative with the value zero.  

Can't remember all the nuances on writing 'vectorized'
versions of those types of conversions.

             - Robert -