matrix.column(i) should throw error when i is larger than the number of columns in the matrix (minus 1).

[jasongrout]

sage: a=matrix([[1,2],[3,4]])
sage: a.column(0)
(1, 3)
sage: a.column(1)
(2, 4)
sage: a.column(3)
(2, 4)
sage: a.column(2)
(1, 3)

The documentation for a.column says that it behaves like list indexing when given a negative index. We should probably also act like list indexing for positive indices that are too big and throw an error:

sage: l=range(3); l
[0, 1, 2]
sage: l[3]
---------------------------------------------------------------------------
<type 'exceptions.IndexError'>            Traceback (most recent call last)

/home/grout/downloads/cython-callback/<ipython console> in <module>()

<type 'exceptions.IndexError'>: list index out of range

Component: linear algebra

Issue created by migration from https://trac.sagemath.org/ticket/2077

[jasongrout]

Attachment: matrix-column-wrapping.patch.gz

[jasongrout]

comment:1

Attachment: matrix-column-wrapping.2.patch.gz

Apply the .2.patch (which corrects a minor typo).

[mwhansen]

comment:3

Looks good to me.

[sagetrac-mabshoff]

comment:4

Merged matrix-column-wrapping.2.patch in Sage 2.10.2.alpha2