[Fwd: [Matplotlib-users] warning: Numeric and amd64]
"Todd" == Todd Miller jmiller@stsci.edu writes:
>>>> from RandomArray import *
>>>> normal(2,2,10) Todd> array([ 2., 2., 2., 2., 2., 2., 2., 2., 2., 2.])
I get this too on a 64bit Opteron 250.
The root of the problem appears to be
from RandomArray import standard_normal standard_normal(10)
array([ 5.31046164e-315, 1.57997427e-314, 5.16421382e-315, 5.22924144e-315, 1.59247813e-314, 1.58920141e-314, 5.23691141e-315, 5.24305935e-315, 5.20686204e-315, 1.58739568e-314])
But MLab.randn, which uses a different approach, works fine.
I've have this gnawing feeling I've seen this before, but I can't remember ....
JDH
On Fri, 2004-10-01 at 09:43, John Hunter wrote:
The root of the problem appears to be
from RandomArray import standard_normal standard_normal(10)
array([ 5.31046164e-315, 1.57997427e-314, I've have this gnawing feeling I've seen this before, but I can't remember ....
Those values look suspiciously like what one sees if one reads a big-endian Float as little-endian or vice versa. I saw similar numbers recently when using pytables on a big-endian HDF5 (which generated a bug report for numarray if you recall).
Is the Opteron big-endian?
On Fri, 2004-10-01 at 09:43, John Hunter wrote:
The root of the problem appears to be
from RandomArray import standard_normal standard_normal(10)
array([ 5.31046164e-315, 1.57997427e-314, I've have this gnawing feeling I've seen this before, but I can't remember ....
Those values look suspiciously like what one sees if one reads a big-endian Float as little-endian or vice versa. I saw similar numbers recently when using pytables on a big-endian HDF5 (which generated a bug report for numarray if you recall).
Is the Opteron big-endian?
On Fri, 2004-10-01 at 09:43, John Hunter wrote:
The root of the problem appears to be
from RandomArray import standard_normal standard_normal(10)
array([ 5.31046164e-315, 1.57997427e-314, I've have this gnawing feeling I've seen this before, but I can't remember ....
Those values look suspiciously like what one sees if one reads a big-endian Float as little-endian or vice versa. I saw similar numbers recently when using pytables on a big-endian HDF5 (which generated a bug report for numarray if you recall).
Is the Opteron big-endian?
On 1 Oct 2004, Todd Miller wrote:
look at this:
from RandomArray import *
normal(2,2,10)
array([ 2., 2., 2., 2., 2., 2., 2., 2., 2., 2.])
This is Numeric 23.1 compiled on my AMD64!!! I ran the same tests on a 32bit P4 and it ran fine. Has anyone else seen this before?
Yes. I just fixed a similar issue in scipy.stats.rand module. Below is the corresponding patch for Numeric Src/ranlibmodule.c that fixes the issue for Opteron.
Regards, Pearu
*** ranlibmodule.c Fri Oct 1 22:29:57 2004 --- ranlibmodule.c.orig Fri Oct 1 22:12:13 2004 *************** *** 47,49 **** case 0: ! *out_ptr = (double) ((float (*)(void)) fun)(); break; --- 47,49 ---- case 0: ! *out_ptr = (double) ((double (*)()) fun)(); break; *************** *** 81,83 **** case 1: ! if( !PyArg_ParseTuple(args, "lf|i", &int_arg, &float_arg, &n) ) { return NULL; --- 81,83 ---- case 1: ! if( !PyArg_ParseTuple(args, "if|i", &int_arg, &float_arg, &n) ) { return NULL; *************** *** 213,215 ****
! if( !PyArg_ParseTuple(args, "lO|i", &num_trials, &priors_object, &n) ) { return NULL; --- 213,215 ----
! if( !PyArg_ParseTuple(args, "iO|i", &num_trials, &priors_object, &n) ) { return NULL;
Thanks Pearu.
For some unknown reason, numarray.random_array already had the fixes, but I applied the patch to Numeric CVS.
Regards, Todd
On Fri, 2004-10-01 at 15:38, Pearu Peterson wrote:
On 1 Oct 2004, Todd Miller wrote:
look at this:
from RandomArray import *
normal(2,2,10)
array([ 2., 2., 2., 2., 2., 2., 2., 2., 2., 2.])
This is Numeric 23.1 compiled on my AMD64!!! I ran the same tests on a 32bit P4 and it ran fine. Has anyone else seen this before?
Yes. I just fixed a similar issue in scipy.stats.rand module. Below is the corresponding patch for Numeric Src/ranlibmodule.c that fixes the issue for Opteron.
Regards, Pearu
*** ranlibmodule.c Fri Oct 1 22:29:57 2004 --- ranlibmodule.c.orig Fri Oct 1 22:12:13 2004
*** 47,49 **** case 0: ! *out_ptr = (double) ((float (*)(void)) fun)(); break; --- 47,49 ---- case 0: ! *out_ptr = (double) ((double (*)()) fun)(); break;
*** 81,83 **** case 1: ! if( !PyArg_ParseTuple(args, "lf|i", &int_arg, &float_arg, &n) ) { return NULL; --- 81,83 ---- case 1: ! if( !PyArg_ParseTuple(args, "if|i", &int_arg, &float_arg, &n) ) { return NULL;
*** 213,215 ****
! if( !PyArg_ParseTuple(args, "lO|i", &num_trials, &priors_object, &n) ) { return NULL; --- 213,215 ----
! if( !PyArg_ParseTuple(args, "iO|i", &num_trials, &priors_object, &n) ) { return NULL;
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participants (4)
-
John Hunter -
Pearu Peterson -
Stephen Walton -
Todd Miller