[Numpy-discussion] Test error with ATLAS, Windows 64 bit

Matthew Brett matthew.brett at gmail.com
Wed Apr 23 15:25:34 EDT 2014


On Tue, Apr 15, 2014 at 12:34 AM, Julian Taylor
<jtaylor.debian at googlemail.com> wrote:
> On Tue, Apr 15, 2014 at 4:30 AM, Matthew Brett <matthew.brett at gmail.com> wrote:
>> It looks as though mingw-w64 is at fault, and I was confused (still
>> am) because of the different behavior with double and a constant:
>> #include <stdio.h>
>> #include <math.h>
>> int main() {
>>     double z, i = -0.0;
>>     printf("With double %f=%f, with constant=%f\n",
>>    i, expm1(i), expm1(-0.));
>> }
>> gives:
>> With double -0.000000=0.000000, with constant=-0.000000
>> That was ugly to track down.
>> What is the right way to work round this (using the numpy version
>> instead of the system version I suppose)?
> The right way is to file a bug at mingw and get it fixed at the source.


> Additionally as this time npymath seems to be better (thats 3 bugs in
> npymath vs 1 in mingw on my scoreboard) one could use the mingw
> preprocessor define instead of HAVE_EXP1M to select this function from
> npymath.

Sorry to be slow - could you unpack what you mean in this paragraph?
Is there a way to force use of the numpy version of the function using
environment variables or similar?



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