BLKDIAG   Block-diagonal concatenation of operator input arguments.
 
    B = blkdiag(OP1,OP2,...) produces the block-diagonal operator
 
             [ OP1                ]
         B = [      OP2           ]
             [           ...      ]
             [                OPN ]
 
    
    
    Copyright 2009, Ewout van den Berg and Michael P. Friedlander
    See the file COPYING.txt for full copyright information.
    Use the command 'spot.gpl' to locate this file.