[Octave-bug-tracker] [bug #36385] indexing of sparse matrix by a matrix in 3.2.4

[jan pfaler]

URL:
  <http://savannah.gnu.org/bugs/?36385>

                 Summary: indexing of sparse matrix by a matrix in 3.2.4 
                 Project: GNU Octave
            Submitted by: jan
            Submitted on: Thu 03 May 2012 02:22:38 PM GMT
                Category: Interpreter
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: jan
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.2.4
        Operating System: GNU/Linux

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Details:

Dear Community,

In 3.2.4 indexing of sparse vector using an non-vector array produces a matrix
of expected size, but with only first row in indexing matrix being taken into
account. Example 1 below is expected to produce equal a and b, but only
realizes the first of a.   

For ndx (row or column) vector, the result is fine, as well as for both val
and ndx being matrices, see Example 2.


*Example 1


val = 1:10; 
ndx = [1:3;7:9], 
sval = sparse(val); 
a = full(sval(ndx)), 
b = val(ndx)




ndx =
   1   2   3
   7   8   9
a =
   7   8   9
   0   0   0
b =
   1   2   3
   7   8   9


*Example 2


ndx = [1:3;7:9], 
val = [1:10;11:20]'; 
sval = sparse(val); 
a = full(sval(ndx)), 
b = val(ndx)



ndx =
   1   2   3
   7   8   9
a =
   1   2   3
   7   8   9
b =
   1   2   3
   7   8   9



Best Regards, 
jan 





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