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MathGroup Archive 2001

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Is there a faster way?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg30552] Is there a faster way?
  • From: Moranresearch at aol.com
  • Date: Wed, 29 Aug 2001 01:39:57 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

I have a large list of 40,000 file names = f1, each file name corresponds to 
a 360 x 19 matrix of real numbers,I need to run the calculation on each file 
and save the answer in a list of results. The method below works but is slow, 
is there a better way? Thank you. John R Moran PhD, MD.

Table[Map[
    StandardDeviation, {Table[.01*
            StandardDeviation[
              Column[Partition[Drop[Import[f1[[j]], "List"], 1], 19], i]] // 
          N, {i, 2, 11}]}], {j, 1, Length[f1]}]



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