#15709: silent conversion of mod to int
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Reporter: ppurka | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.1
Component: coercion | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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From the [https://spreadsheets.google.com/pub?key=pCwvGVwSMxTzT6E2xNdo5fA
google notebook bug reports]
{{{
# I lost several hours because Sage silently converted a number defined
mod n to an integer
# when it appeared as an exponent.
# I was working in a different cyclotomic field, but the problem is right
here in the complex numbers.
# I believe I should have to explicitly convert to an integer unless the
answer only depends on the value mod n.
a=Mod(3,2)
print type(a),a,2*a,(i^2)^a,i^(2*a)
Output:
<type 'sage.rings.finite_rings.integer_mod.IntegerMod_int'> 1 0 -1 1
}}}
''This must surely have been discussed before. I would have tried to look
up the discussion if I thought there was any hope that someone could
convince me that this is not actually a bug.''
''Mod is not a synonym for remainder, and Sage is very good about not
making the answer an integer. By later silently converting the answer into
a remainder it has forsaken me, and undermined my trust.''
(P.S.: The "I" above is not me. -ppurka)
--
Ticket URL: <http://trac.sagemath.org/ticket/15709>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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