#6554: [with patch, needs review] plotting sparse matrices converts the matrix
to
a dense matrix
----------------------------+-----------------------------------------------
Reporter: jason | Owner: was
Type: defect | Status: new
Priority: major | Milestone: sage-4.1.1
Component: linear algebra | Keywords:
Reviewer: | Author: Jason Grout
Merged: |
----------------------------+-----------------------------------------------
Comment(by wdj):
This installs fine (amd64 ubuntu 9.04, sage 4.1.1.alpha0) and I'm running
tests now. However, why is it that
{{{
sage: B = random_matrix(ZZ, 10, 20, density=.4, sparse=True, x = 10)
sage: matrix_plot(B, cmap='hsv').show(axes=False)
}}}
returns a ble-and white scatterplot, but
{{{
sage: C = random_matrix(ZZ, 10, 20, x = 10)
sage: matrix_plot(C, cmap='hsv').show(axes=False)
}}}
returns a multi-colored plot? The docstring indicates that the colors
plotted
indicate the relative difference in sizes between the matrix entries. This
seems
to be incorrect, unless I am missing something, in the sparse case. Should
a
comment to this effect be added to the docstring?
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6554#comment:4>
Sage <http://sagemath.org/>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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