#12120: Improve documentation of numerical_approx()
---------------------------------+------------------------------------------
Reporter: saraedum | Owner: mvngu
Type: enhancement | Status: needs_review
Priority: trivial | Milestone: sage-5.3
Component: documentation | Resolution:
Keywords: beginner | Work issues:
Report Upstream: N/A | Reviewers: Eviatar Bach, Karl-Dieter
Crisman
Authors: Julian Rueth | Merged in:
Dependencies: | Stopgaps:
---------------------------------+------------------------------------------
Old description:
> In a class on computer algebra, students were surprised by the behavior
> of the N() function. Here are some minimal examples that should
> illustrate the issues we ran into:
>
> {{{
> sage: x=N(pi,digits=3); x
> 3.14
> sage: y=N(3.14,digits=3); y
> 3.14
> sage: x==y
> False
> }}}
>
> {{{
> sage: N(pi,digits=1)
> 3.2
> }}}
>
> {{{
> sage: N(pi-3,prec=2)
> 0.00
> }}}
>
> Imo, none of these is a bug, but I believe that the documentation should
> be improved.
New description:
In a class on computer algebra, students were surprised by the behavior of
the N() function. Here are some minimal examples that should illustrate
the issues we ran into:
{{{
sage: x=N(pi,digits=3); x
3.14
sage: y=N(3.14,digits=3); y
3.14
sage: x==y
False
}}}
{{{
sage: N(pi,digits=1)
3.2
}}}
{{{
sage: N(pi-3,prec=2)
0.00
}}}
Imo, none of these is a bug, but I believe that the documentation should
be improved.
----
Apply [attachment:trac_12120_numerical_approx.patch] and
[attachment:trac_12120-review.patch] to the Sage library.
--
Comment (by kcrisman):
Patchbot: apply trac_12120_numerical_approx.patch and
trac_12120-review.patch
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12120#comment:16>
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