[Octave-bug-tracker] [bug #37774] Slicing sparse matrix gives wrong result

[Kim Hansen]

URL:
  <http://savannah.gnu.org/bugs/?37774>

                 Summary: Slicing sparse matrix gives wrong result
                 Project: GNU Octave
            Submitted by: kimhanse
            Submitted on: Mon 19 Nov 2012 07:36:39 PM CET
                Category: Interpreter
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: GNU/Linux

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Details:

"sparse(zeros(1))(false,:)" gives a 0x0 matrix, I think this it should give a
0x1 matrix. 

Running the following:


zeros(0)(false,:)
zeros(1)(false,:)
zeros(2)(false,:)
zeros(3)(false,:)
sparse(zeros(0))(false,:)
sparse(zeros(1))(false,:)
sparse(zeros(2))(false,:)
sparse(zeros(3))(false,:)


gives this result on newest octave:


octave:1> zeros(0)(false,:)
ans = [](0x0)
octave:2> zeros(1)(false,:)
ans = [](0x1)
octave:3> zeros(2)(false,:)
ans = [](0x2)
octave:4> zeros(3)(false,:)
ans = [](0x3)
octave:5> sparse(zeros(0))(false,:)
ans = Compressed Column Sparse (rows = 0, cols = 0, nnz = 0)

octave:6> sparse(zeros(1))(false,:)
ans = Compressed Column Sparse (rows = 0, cols = 0, nnz = 0)   << ERROR HERE

octave:7> sparse(zeros(2))(false,:)
ans = Compressed Column Sparse (rows = 0, cols = 2, nnz = 0)

octave:8> sparse(zeros(3))(false,:)
ans = Compressed Column Sparse (rows = 0, cols = 3, nnz = 0)

octave:9> 






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