I'm trying to use the combinatorics features in Sage to do some Chern
class calculations. When I run the commands below, I get exceptions
that I don't know how to interpret.
The same calculation in Maple using John Stembridge's SF package
completes successfully using roughly 149 MB and 7.08 s CPU time.
Is this just an issue of memory limitation? If so, can (and how do) I
lift the limitation to access more of the 2 GB I have on the machine
I'm running this on?
code follows:
I'm using Sage 2.8.15 on an i386 Linux platform. I also tried this on
an Intel OS X 10.5 machine with the same result. Also, all the powers
of "f" from 1 to 7 work fine. f^8 and higher powers fail.
-----------------------------------
sage: s=SFASchur(QQ)
sage: f=s([2,1]); f
s[2, 1]
sage: f^8
---------------------------------------------------------------------------
<type 'exceptions.NotImplementedError'> Traceback (most recent call
last)
/Users/benjaminjones/Desktop/sage-2.8.15-osx10.5-intel-i386-Darwin/
<ipython console> in <module>()
/Users/benjaminjones/Desktop/sage-2.8.15-osx10.5-intel-i386-Darwin/
local/lib/python2.5/site-packages/sage/combinat/sfa.py in
__pow__(self, n)
881 z = A(Integer(1))
882 for i in range(n):
--> 883 z *= self
884 return z
885
/Users/benjaminjones/Desktop/sage-2.8.15-osx10.5-intel-i386-Darwin/
element.pyx in sage.structure.element.RingElement.__imul__()
.
.
.
.
/Users/benjaminjones/Desktop/sage-2.8.15-osx10.5-intel-i386-Darwin/
symmetrica.pxi in sage.libs.symmetrica.symmetrica._py()
<type 'exceptions.NotImplementedError'>: 22
sage:
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