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MathGroup Archive 2007

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sparsearray and its nonempty cells

  • To: mathgroup at smc.vnet.net
  • Subject: [mg72591] sparsearray and its nonempty cells
  • From: Arkadiusz.Majka at gmail.com
  • Date: Thu, 11 Jan 2007 03:20:40 -0500 (EST)

Hi,

I bulit the following sparse array

Mysparse=SparseArray[i_ /; 2 â?¤ i â?¤ 11 :> 0.8, 20]

in order to find out all nonempty cells in this array I call (I want to
avoid Normal)


Mysparse/. SparseArray[_, _, _, x_] :> x[[2, 2]]

and I get

{{8}, {11}, {3}, {7}, {2}, {6}, {10}, {9}, {5}, {4}}

This is of course correct, but why it is not sorted????

How can I build Mysparse to get sorted list of nonempty cells?

Arek


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