Re: sparsearray and its nonempty cells

*To*: mathgroup at smc.vnet.net*Subject*: [mg72621] Re: sparsearray and its nonempty cells*From*: Bill Rowe <readnewsciv at sbcglobal.net>*Date*: Fri, 12 Jan 2007 06:09:50 -0500 (EST)

On 1/11/07 at 3:20 AM, Arkadiusz.Majka at gmail.com wrote: >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? Use ArrayRules In[5]:= Most[First/@ArrayRules[Mysparse]] Out[5]= {{2},{3},{4},{5},{6},{7},{8},{9},{10},{11}} -- To reply via email subtract one hundred and four