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<A NAME=block_matrix>

<TITLE>block_matrix</TITLE></A>
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<B>BLOCK_MATRIX</B> _ _ _  _ _ _  _ _ _  _ _ _ <B>operator</B><P>
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syntax: </H3>
<em>block_matrix</em>(&lt;r&gt;,&lt;c&gt;,&lt;matrix\_list&gt;) 
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&lt;r&gt;,&lt;c&gt; :- positive integers. 
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&lt;matrix\_list&gt; :- a list of matrices. 
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<em>block_matrix</em>creates a matrix that consists of &lt;r&gt; by 
&lt;c&gt; matrices filled from the &lt;matrix\_list&gt; row wise. 
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examples: </H3>
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B := make_identity(2); 

       [1  0]
  b := [    ]
       [0  1]



C := mat((5),(5)); 

       [5]
  c := [ ]
       [5]



D := mat((22,33),(44,55)); 

       [22  33]
  d := [      ]
       [44  55]



block_matrix(2,3,{B,C,D,D,C,B}); 


  [1   0   5  22  33]
  [                 ]
  [0   1   5  44  55]
  [                 ]
  [22  33  5  1   0 ]
  [                 ]
  [44  55  5  0   1 ]

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