#5359: Block matrix viewing is broken
----------------------+-----------------------------------------------------
 Reporter:  kcrisman  |       Owner:  cwitty    
     Type:  defect    |      Status:  new       
 Priority:  minor     |   Milestone:  sage-3.4.1
Component:  misc      |    Keywords:            
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 From sage-support:

 Viewing block matrices "nicely" seems to be difficult in Sage.
 {{{
 sage: A=matrix([[1]])
 sage: B=matrix([[2]])
 sage: C=matrix([[3]])
 sage: D=matrix([[4]])
 sage: BM=block_matrix([A,B,C,D])
 sage: BM
 [1|2]
 [-+-]
 [3|4]
 }}}
 Okay, this is fine but a little clunky.  Let's try something nicer:
 {{{
 sage: show(BM)
 }}}
 Upon which a dvi viewer opens up, unfortunately not a very nice one...
 and shows the block matrix with only a vertical dividing line, not a
 horizontal one!
 Okay, let's try the notebook:

 {{{
 A=matrix([[1]])
 B=matrix([[2]])
 C=matrix([[3]])
 D=matrix([[4]])

 BM=block_matrix([A,B,C,D]);BM

 [1|2]
 [-+-]
 [3|4]
 }}}

 So far so good, but when I click "Typeset" to get a LaTeXed matrix...
 {{{
 BM=block_matrix([A,B,C,D]);BM

 <html><span class="math">\left(\begin{array}{r|r}
 1 & 2 \\
 3 & 4
 \end{array}\right)</span></html>
 }}}
 Which as you can see does NOT have any "blockiness" to it at all.
 Very pretty, but not a block matrix, at least not identifiably so.

-- 
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/5359>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of 
Reinventing the Wheel

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