In general doing vectorized calculations on larger data units is going to lead
to faster computation, so it would be better in the long run if your taste
could evolve to appreciate Jim's approach.
On October 30, 2018 10:03:15 PM PDT, Rolf Turner <r.tur...@auckland.ac.nz>
wrote:
>
>On 10/31/18 3:47 PM, jim holtman wrote:
>
>>> s2 <- apply(x*x, 2, sum)
>>> s2
>> [1] 55 330
>
><SNIP>
>
>It seems to me to be more "natural" (and perhaps more amenable to
>generalisation) to do:
>
> s2 <- apply(x,2,function(v){sum(v^2)})
>
>But it's probably just a matter of taste.
>
>cheers,
>
>Rolf
--
Sent from my phone. Please excuse my brevity.
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