#6642: [with patch, needs work] problem with solve (from the tutorial)
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Reporter: jhpalmieri | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-4.1.2
Component: symbolics | Keywords:
Reviewer: | Author:
Merged: |
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Comment(by jhpalmieri):
In 4.1.2.alpha1, I'm getting something odd when I don't specify
{{{explicit_solutions}}}:
{{{
sage: solve(sin(x) == cos(x), x, explicit_solutions=False)
[sin(x) == cos(x)]
sage: solve(sin(x) == cos(x), x, explicit_solutions=True)
[]
sage: solve(sin(x) == cos(x), x)
[x == r2, x == r1]
}}}
I think at least two changes are in order, if I understand the code right:
first, change the default value for explicit_solutions from "None" to
"False". As it stands, in the "if" block that starts with the line
{{{
if explicit_solutions is not False:
}}}
the code is executed if explicit_solutions is None or True, but not if
it's False. I suppose this line could be changed to
{{{
if bool(explicit_solutions) is not False:
}}}
Second, several comments ("We only reach this if explicit_solutions is
None", "This is fine because explicit_solutions is None") may need to be
changed to reflect this.
Of course, I could be misunderstanding everything, and we want "False",
"True", and "None" to each behave differently. If so, this needs to be
documented; for example, "explicit_solutions" is not a bool in this case.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6642#comment:2>
Sage <http://sagemath.org/>
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