Displaying 2 results from an estimated 2 matches for "r_visnan".
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2019 Sep 29
2
speed up R_IsNA, R_IsNaN for vector input
...ear R developers,
I spotted that R_isNA and R_IsNaN could be improved when applied on a
vector where we could take out small part of their logic, run it once,
and then reuse inside the loop.
I setup tiny plain-C experiment. Taking R_IsNA, R_IsNaN from R's
arithmetic.c, and building R_vIsNA and R_vIsNaN accordingly.
For double input of size 1e9 (having some NA and NaN) I observed
following timings:
R_IsNA 6.729s
R_vIsNA 4.386s
R_IsNaN 6.874s
R_vIsNaN 4.479s
ISNAN 4.392s
It looks like R_vIsN(A|aN) are close to ISNAN (which just wraps to
math.h::isnan).
Should I follow up with a patc...
2019 Sep 30
0
speed up R_IsNA, R_IsNaN for vector input
...on is biased
towards the case that such values are rare and that it is ok to
sometimes say "there may be non-finite values" even when in fact they
are not.
Best
Tomas
> I setup tiny plain-C experiment. Taking R_IsNA, R_IsNaN from R's
> arithmetic.c, and building R_vIsNA and R_vIsNaN accordingly.
> For double input of size 1e9 (having some NA and NaN) I observed
> following timings:
>
> R_IsNA 6.729s
> R_vIsNA 4.386s
>
> R_IsNaN 6.874s
> R_vIsNaN 4.479s
>
> ISNAN 4.392s
>
> It looks like R_vIsN(A|aN) are close to ISNAN (which just...