#17549: Rephrase the 'doctest flags' section of the developer's manual
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Reporter: | Owner:
ncohen | Status: needs_work
Type: | Milestone: sage-6.5
enhancement | Resolution:
Priority: major | Merged in:
Component: | Reviewers:
documentation | Work issues:
Keywords: | Commit:
Authors: | 6ff61bdd86d0031d12e13cf89d0e4041da343bc3
Nathann Cohen | Stopgaps:
Report Upstream: N/A |
Branch: |
u/ncohen/17549 |
Dependencies: |
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Comment (by jdemeyer):
Perhaps add something along the lines of
{{{
If a doctest with tolerance contains several numbers, each of them is
checked individually::
sage: print "The sum of 1 and 1 equals 5" # abs tol 1
The sum of 2 and 2 equals 4
As a consequence of this, tests involving complex numbers, matrices or
polynomials usually work as expected::
sage: <complex number example here>
sage: M = Matrix(RR, 3, 3, [-13, 1, 1, -3, 0, -2, -4, -2, 0])
sage: M^-1 * M # actual result
[ 1.00000000000000 6.93889390390723e-18 -6.24500451351651e-17]
[ 4.44089209850063e-16 1.00000000000000 1.11022302462516e-16]
[-1.94289029309402e-16 -1.38777878078145e-17 1.00000000000000]
sage: M^-1 * M # tol 2e-16
[ 1.00000000000000 0.000000000000000 0.000000000000000]
[0.000000000000000 1.00000000000000 0.000000000000000]
[0.000000000000000 0.000000000000000 1.00000000000000]
Note that, in the last example, the zeros are checked with **absolute**
tolerance, while the non-zero entries are checked with **relative**
tolerance.
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/17549#comment:6>
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