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matrix problem

  • To: mathgroup at smc.vnet.net
  • Subject: [mg107095] matrix problem
  • From: Piotr Munik <piotr.munik at gmail.com>
  • Date: Tue, 2 Feb 2010 06:53:46 -0500 (EST)

Dear Math Group,

I have matrix M and matrix N
for example
M={{1,2},{3,4},{5,6},{7,8}}
N={{1,8},{5,0},{9,7}}
(dimension is diffrent)
I need to make new matrixes which include only this rows from matrix M and
matrix N for which firsts elements are the same in both matrix (M and N).
so I need
M1={{1,2},{5,6}}
N1={{1,8},{5,0}}
 Elements of matrix are real (not always integer)
Please for help
Peter



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