#15970: j_invariant_qexp won't allow substitution
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Reporter: | Owner:
katestange | Status: new
Type: defect | Milestone: sage-6.2
Priority: minor | Keywords: j-invariant, laurent series,
Component: number | q-expansion, substitution
theory | Authors:
Merged in: | Report Upstream: N/A
Reviewers: | Branch:
Work issues: | Dependencies:
Commit: |
Stopgaps: |
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{{{
jq = j_invariant_qexp(10)
jqsub = jq.substitute(q = e^(-2*pi))
}}}
This used to work (Sage 4.8). It ought to return an approximation to 1728
(this is useful behaviour...). E.g.
{{{
n(jqsub)
1727.99999999999
}}}
But now it raises...
{{{
ValueError: Can only substitute elements of positive valuation
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/15970>
Sage <http://www.sagemath.org>
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