Displaying 2 results from an estimated 2 matches for "r52937".
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52937
2010 Sep 21
0
Speeding up squaring of vectors
...ng up x^2 has been addressed in an inadvisable way,
however. This was a simple addition of four lines of code that speeds
up squaring of real vectors by a factor of about six (for vectors of
length 10000), by just converting x^2 to x*x. Modifications in the
current development version (r52936 and r52937) attempt to address
this issue in a different way, but they produce a smaller speedup. My
modification is about 2.6 faster than the current development version
(on an Intel/Linux system). Similarly, in the current development
version, x*x is still about 2.6 times faster than x^2. Furthermore,
the...
2010 Sep 03
1
Fourteen patches to speed up R
I've continued to work on speeding up R, and now have a collection of
fourteen patches, some of which speed up particular functions, and
some of which reduce general interpretive overhead. The total speed
improvement from these patches is substantial. It varies a lot from
one R program to the next, of course, and probably from one machine to
the next, but speedups of 25% can be expected in