@return ptr to a new Sparse matrix where each element is the result of the logical operator
'==' between the elements of *this and those of o.
*/
- SparseBool* newEqualTo(Sparse const&o) const;
+ SparseBool* newEqualTo(Sparse &o);
/**
output 1-base column numbers of the non zero elements
Sparse* newOnes() const;
SparseBool* newNotEqualTo(SparseBool const&o) const;
- SparseBool* newEqualTo(SparseBool const&o) const;
+ SparseBool* newEqualTo(SparseBool& o);
SparseBool* newLogicalOr(SparseBool const&o) const;
SparseBool* newLogicalAnd(SparseBool const&o) const;