Douglas Weathers
https://groups.google.com/forum/#!topic/sage-devel/QoboPuLUmw8
from a couple of years ago, and I see that the ticket
http://trac.sagemath.org/ticket/4539#no1
has been merged into SAGE 5 (I have 6.0). So when I try the example in the Google group I get the following error:
---
sage: F.<x,y,z,dx,dy,dz> = FreeAlgebra(QQ,6)
sage: G = F.g_algebra({dx*x: x*dx + 1, dy*y: y*dy + 1, dz*z: z*dz + 1})
---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
<ipython-input-10-6517c692228f> in <module>()
----> 1 G = F.g_algebra({dx*x: x*dx + Integer(1), dy*y: y*dy + Integer(1), dz*z: z*dz + Integer(1)})
/opt/sage-6.0-i686-Linux/local/lib/python2.7/site-packages/sage/algebras/free_algebra.pyc in g_algebra(self, relations, names, order, check)
917 base_ring=self.base_ring()
918 n=self.ngens()
--> 919 cmat=Matrix(base_ring,n)
920 dmat=Matrix(self,n)
921 for i in xrange(n):
/opt/sage-6.0-i686-Linux/local/lib/python2.7/site-packages/sage/matrix/constructor.pyc in _matrix_constructor(*args, **kwds)
558 # check to see if the number of rows is specified
559 try:
--> 560 import numpy
561 if isinstance(args[0], numpy.ndarray):
562 raise TypeError
/opt/sage-6.0-i686-Linux/local/lib/python2.7/site-packages/numpy/__init__.py in <module>()
135 return loader(*packages, **options)
136
--> 137 import add_newdocs
138 __all__ = ['add_newdocs']
139
/opt/sage-6.0-i686-Linux/local/lib/python2.7/site-packages/numpy/add_newdocs.py in <module>()
7 # core/fromnumeric.py, core/defmatrix.py up-to-date.
8
----> 9 from numpy.lib import add_newdoc
10
11 ###############################################################################
/opt/sage-6.0-i686-Linux/local/lib/python2.7/site-packages/numpy/lib/__init__.py in <module>()
11
12 import scimath as emath
---> 13 from polynomial import *
14 #import convertcode
15 from utils import *
/opt/sage-6.0-i686-Linux/local/lib/python2.7/site-packages/numpy/lib/polynomial.py in <module>()
9 import re
10 import warnings
---> 11 import numpy.core.numeric as NX
12
13 from numpy.core import isscalar, abs, finfo, atleast_1d, hstack, dot
AttributeError: 'module' object has no attribute 'core'
---
How do I fix this? Thanks!
Dima Pasechnik
> The rabbit hole led me to this discussion
>
> https://groups.google.com/forum/#!topic/sage-devel/QoboPuLUmw8
>
> from a couple of years ago, and I see that the ticket
>
> http://trac.sagemath.org/ticket/4539#no1
>
> has been merged into SAGE 5 (I have 6.0). So when I try the example in the Google group I get the following error:
>
> ---
>
> sage: F.<x,y,z,dx,dy,dz> = FreeAlgebra(QQ,6)
> sage: G = F.g_algebra({dx*x: x*dx + 1, dy*y: y*dy + 1, dz*z: z*dz + 1})