[OctDev] sparse: size and indexing

[Schloegl A. <alo...@tu...>]

I'm using the latest CVS-versions of Octave and Octave-forge and observed
two problems using SPARSE matrices.

(1) size of a sparse matrix can not be obtained, [-1,-1] is returned.

(2) indexing of a sparse field within a struct stops with an error.

Issue (1) was working well in Octave4Windows 2.1.50. Obviously, it broke at some
time


Repeat-By:
---------

 octave:1> which sparse
sparse is the dynamically-linked function from the file
/usr/local/libexec/octave/2.1.57/site/oct/i686-pc-linux-gnu/octave-forge/sparse.oct
octave:2>  x=sparse(2:31,1:30,1,31,30);
octave:3> size(x)
ans =

  -1  -1

octave:4>  H.x=sparse(2:31,1:30,1,31,30);
octave:5> size(H.x)
ans =

  -1  -1

octave:6> x(2:4,:)    % Here, indexing works well
ans =

Compressed Column Sparse (rows=3, cols=30, nnz=3)
  (1 , 1) -> 1
  (2 , 2) -> 1
  (3 , 3) -> 1

octave:7> H.x(2:4,:)   % Here, indexing does not work
error: can't perform indexing operations for sparse type
octave:7>