#13571: Matrix Entries Can Be Callable Objects not tested
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Reporter: startakovsky | Owner: tbd
Type: defect | Status: closed
Priority: minor | Milestone: sage-5.5
Component: PLEASE CHANGE | Resolution: invalid
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: | Merged in:
Dependencies: | Stopgaps:
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Changes (by mhansen):
* status: new => closed
* resolution: => invalid
Comment:
It gives examples of passing in a callable object:
{{{
sage: m = matrix(QQ, 3, 3, lambda i, j: i+j); m
[0 1 2]
[1 2 3]
[2 3 4]
sage: m = matrix(3, lambda i,j: i-j); m
[ 0 -1 -2]
[ 1 0 -1]
[ 2 1 0]
sage: matrix(QQ,2,3,lambda x, y: x+y)
[0 1 2]
[1 2 3]
sage: matrix(QQ,3,2,lambda x, y: x+y)
[0 1]
[1 2]
[2 3]
}}}
It is impossible to get a _matrix_ like
{{{
['apple', 'frog']
[[3,2] , 3 ]
}}}
since a matrix requires that the entries be elements of a ring (so things
like multiplication and addition are defined). You could either use a
list of lists or a numpy array like
{{{
sage: import numpy as np
sage: a = np.array([['apple', 'frog'],[[3,2], 3]], dtype=object); a
array([[apple, frog],
[[3, 2], 3]], dtype=object)
sage: a[1,0]
[3, 2]
sage: a.transpose()
array([[apple, [3, 2]],
[frog, 3]], dtype=object)
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13571#comment:4>
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