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Topic review - Calling singular.invariant_theory() from Sagemath
Author Message
kummini
  Post subject:  Re: Calling singular.invariant_theory() from Sagemath  Reply with quote
This is a possible bug in SageMath: see the reply for my question at the ask.sagemath.org forum. (I am unable to post its URL here.)
Post Posted: Fri Aug 23, 2019 2:58 am
kummini
  Post subject:  Calling singular.invariant_theory() from Sagemath  Reply with quote
(I have posted this question on the ask.sagemath forum also.) I am trying to compute an invariant ring for a finite group using Singular through Sagemath, but I get an error. Here is a minimal example.
Code:
singular.lib('finvar.lib')
R = singular.ring(3,'(x0, x1)', 'dp')
g = singular.matrix(2,2,'1,0,1,1')
singuslar.invariant_ring(g)

However I get an error:
Code:
  File "/usr/lib/python2.7/dist-packages/sage/interfaces/singular.py", line 653, in eval
    raise SingularError('Singular error:\n%s'%s)
TypeError: Singular error:
   ? assign not impl.
   ? error occurred in or before STDIN line 16: `        return(P,S);`

(This happens in Debian 9, with sagemath and Singular installed using apt, and in Debian 10, both installed the same way, and on the Sage Cell server.)
How do I fix this problem?
Post Posted: Wed Aug 21, 2019 11:18 pm


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