Slicing in sparse

[Kim Hansen]

Slicing in sparse matrices do not do the same as full matrices in some
corner cases:

octave:2> m=[true false];
octave:3> f=zeros(0,2);
octave:4> s=sparse(f);
octave:7> f(:,m)=0
f = [](0x2)
octave:8> s(:,m)=0
s =
Compressed Column Sparse (rows = 1, cols = 2, nnz = 0)
octave:9>

I have attached a new test that compares the behaviour of sparse and
full, the test works but it contains 12 known errors marked with
xtest.

Regards,
-- 
Kim Hansen
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