LLSparseMatrix_implementation

LLSparseMatrix operations

Methods are listed in the same order as in the source code.

Operation	State	Tested	Comments
`is_symmetric`	✅	🔴	Property
`__dealloc__`	✅	🔴	Needs to be checked
`_realloc`	✅	🔴	Needs to be checked
`_realloc_expand`	✅	🔴	Needs to be checked
`compress`	✅	🔴	In place and free physical memory
`copy`	✅	🔴	Deep copy
`generalize`	✅	🔴	In place
`delete_rows`	✅	🔴	Inefficient
`delete_cols`	✅	🔴	Very inefficient
`tril`	✅	✅	-
`triu`	✅	✅	-
`hstack`	🔴	🔴	-
`vstack`	🔴	🔴	-
`delete_row`	✅	🔴	-
`clear_submatrix`	✅	🔴	Wipe out zeros.
`memory_real`	✅	🔴	Internal memory used for arrays.
`create_transpose`	✅	🔴	Real matrix.
`create_conjugate_transpose`	✅	🔴	Real matrix. Only for complex matrices.
`create_conjugate`	✅	🔴	Real matrix. Only for complex matrices.
`is_sorted`	✅	🔴	Internal method.
`to_csr`	✅	🔴	-
`to_csc`	✅	🔴	-
`to_ndarray`	✅	🔴	-
`assign`	✅	🔴	Works with views.
`put`, `safe_put`	✅	🔴	Internal methods.
`at`, `safe_at`	✅	🔴	Internal methods.
`put_triplet`	✅	🔴
`take_triplet`	✅	🔴
`put_diagonal`	✅	🔴
`keys`	✅	🔴
`values`	✅	🔴
`items`	✅	🔴
`find`	✅	🔴
`diag`	✅	🔴
`diags`	✅	🔴
`shift`	✅	🔴
`update_add_at`	✅	🔴
`matvec`	✅	✅
`matvec_transp`	✅	✅
`matvec_htransp`	✅	✅	Only for complex matrices.
`matvec_conj`	✅	✅	Only for complex matrices.
`matdot`	✅	🔴
`matdot_transp`	✅	🔴
`matdot_transp_self`	✅	🔴
`scale`	✅	🔴
`col_scale`	✅	🔴
`row_scale`	✅	🔴
`norm`	✅	🔴
`print_to`	✅	🔴	Need complete rewriting.