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MathGroup Archive 2012

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Parallelize and Array access

  • To: mathgroup at smc.vnet.net
  • Subject: [mg126663] Parallelize and Array access
  • From: John <glossner at gmail.com>
  • Date: Wed, 30 May 2012 04:07:38 -0400 (EDT)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com

The code below works fine in serial execution. Since results[i][j] is
not valid outside the Parallelize statement, what is the best way to
code this in Mathematica? I've searched this forum, Mathematica help,
and tried many alternatives to no avail. Thanks for any ideas.

AddSub[a_, b_] :=
  Module[{p, s},
   p = a + b;
   s = a - b;
   Return[{p, s}]
   ];

numElements = 5;
Parallelize[
  a = Range[numElements];
  b = Range[numElements];
  Do[
   result[i][j] = AddSub[a[[i]], b[[j]]];
   , {i, 1, numElements}, {j, 1, numElements}
   ];
  ];

anotherVariable = result;

Do[Print["anotherVariable[", x, "][", y, "] = ",
   anotherVariable[x][y]], {x, 1, numElements}, {y, 1, numElements}];




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