#13081: Add a numpy() method to all vectors.
-----------------------------------+----------------------------------------
Reporter: robertwb | Owner: jason, was
Type: defect | Status: needs_work
Priority: major | Milestone: sage-5.1
Component: linear algebra | Resolution:
Keywords: | Work issues: better error with bad dtype
Report Upstream: N/A | Reviewers: Karl-Dieter Crisman
Authors: Robert Bradshaw | Merged in:
Dependencies: | Stopgaps:
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Changes (by {'newvalue': u'Robert Bradshaw', 'oldvalue': ''}):
* status: needs_review => needs_work
* reviewer: => Karl-Dieter Crisman
* work_issues: => better error with bad dtype
* author: => Robert Bradshaw
Comment:
This looks pretty good overall. It would be nice for the newbie to have a
little more documentation, maybe, of other `dype`s built in to Sage,
especially since not all the ones listed
[http://docs.scipy.org/doc/numpy/user/basics.types.html here] are
available. Which ones are? I found `int`, `bool`, `complex`, `float`,
but not all of the specific bit or `uint` ones. Also, where the heck does
`object` get predefined? In `stdsage.something`?
{{{
sage: v = vector([i,3/4,55.6])
sage: v.numpy(dtype=complex)
array([ 0.00+1.j, 0.75+0.j, 55.60+0.j])
sage: w = vector([-2,3, 4.0])
sage: w.numpy(dtype=bool)
array([ True, True, True], dtype=bool)
}}}
I do think we need a better error message in the case that Sage has the
dtype, but it's not valid.
{{{
sage: v = vector([i,3/4,55.6])
sage: v.numpy(dtype=int)
---------------------------------------------------------------------------
<snip>
ValueError: setting an array element with a sequence.
}}}
Finally, though it's not directly relevant to this ticket, why can't I
bring a numpy thing directly back to Sage? I can do `vector(v.numpy())`
but apparently not just `v.nump()._sage_()`. Strange.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13081#comment:3>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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