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Re: Package to 'graft' Lists onto Matrices

  • To: mathgroup at smc.vnet.net
  • Subject: [mg87742] Re: [mg87667] Package to 'graft' Lists onto Matrices
  • From: "W_Craig Carter" <ccarter at mit.edu>
  • Date: Wed, 16 Apr 2008 05:06:34 -0400 (EDT)
  • References: <200804150952.FAA25046@smc.vnet.net>

Hello, You might try these:

 mat = RandomInteger[{0, 10}, {5, 7}];
 mat // MatrixForm
 AddRow[mat_?MatrixQ, row_List] := Join[mat, {row}]
 AddRow[mat, {a, b, c, d, e, f, g}] // MatrixForm

 AddColumn[mat_?MatrixQ, column_List] :=
  Transpose[Join[Transpose[mat], {column}]]
 AddColumn[mat, {a, b, c, d, e}] // MatrixForm

 No checking here or matching dimensions, but that could be built in easily.



>
>   It seems a little daft that that you need to use MapThread and Append to simply graft a row onto an existing matrix!
>



-- 
W. Craig Carter


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