#5174: _repr_ for large matrices should indicate how to see the entries
------------------------------+---------------------------------------------
Reporter: jason | Owner: was
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-4.3
Component: linear algebra | Keywords:
Work_issues: | Author: John Palmieri
Upstream: N/A | Reviewer:
Merged: |
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Changes (by newvalueoldvalue):
* status: new => needs_review
* author: => John Palmieri
Comment:
Here's a patch. The docstring to the {{{__repr__}}} method for matrices
illustrates what the patch does:
{{{
EXAMPLES::
sage: A = matrix([[1,2], [3,4], [5,6]])
sage: A.__repr__()
'[1 2]\n[3 4]\n[5 6]'
sage: print A
[1 2]
[3 4]
[5 6]
If the matrix is too big, don't print all of the elements::
sage: A = random_matrix(ZZ, 100)
sage: A.__repr__()
"100 x 100 dense matrix over Integer Ring (type 'print
A.str()' to see all of the entries)"
sage: print A
100 x 100 dense matrix over Integer Ring (type 'print A.str()'
to see all of the entries)
If there are several names for the same matrix, write it as
"obj"::
sage: B = A; print B
100 x 100 dense matrix over Integer Ring (type 'print
obj.str()' to see all of the entries)
}}}
I actually think that this looks a little funny in some situations; for
example, in chain_complex.py, the old version did this:
{{{
sage: C.differential()
{0: 40 x 40 dense matrix over Integer Ring, 1: []}
}}}
while the new version does this:
{{{
sage: C.differential()
{0: 40 x 40 dense matrix over Integer Ring (type 'print
obj.str()' to see all of the entries), 1: []}
}}}
It would be pretty easy to change the print representation so if there
were no name attached to the object (e.g., if it were produced by another
method, as in this example), then the extra message about "print ..."
would be omitted. Opinions?
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/5174#comment:3>
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