[SciPy-dev] Monte Carlo package
Ed Schofield
schofield at ftw.at
Tue Jan 24 12:35:45 EST 2006
Robert Kern wrote:
>Ed Schofield wrote:
>
>
>>Hi all,
>>
>>The Monte Carlo package now builds and runs fine for me on MinGW. I'd
>>now like to ask for some help with testing on other platforms. (Are
>>there any that don't define the rand() function? ;)
>>
>>
>I really would prefer that it not use rand() but use numpy.random instead. What
>do you need to make this happen?
>
>
Hmmm ... do you mean rk_random() defined in
numpy/random/mtrand/randomkit.c? I guess I could link to this instead of
the system default rand(), but this is probably overkill for this
application. I just need a single 30-bit random number per instance, to
use as a seed. I could use the system time directly, but at the moment
I use rand() to scramble it up a little first:
/* First seed our faster XORshift RNG. */
/* We need to do this in a way that supports non-SVID C platforms.
* We use rand() twice, constructing a 30-bit integer out of the
* two results. */
srand( (unsigned int) time( NULL ));
seedhigh = rand();
seedlow = rand();
/* Construct a 30-bit random integer out of these. */
jxr = ((seedhigh & 0x3fff) << 16) + (seedlow & 0xffff);
I fear that depending on the randomkit.h header would just add an
unnecessary build dependency. Do you still see a need for it?
-- Ed
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