Add assembleStorage and disassembleStorage methods for JDS

[KyleVaughn]

Description:

For the JDS matrix class, implement the assembleStorage and disassembleStorage methods that convert the data stored in the _buildCoeff attribute of the base SparseMatrix class to the format specified by the JDS format and vice versa. For a description of the JDS format this library will use, see #6 .

Tasks:

• [ ] Implement the assembleStorage method that
  • [ ] Converts the data stored in _buildCoeff to the JDS-specific attributes defined by #6
  • [ ] Properly utilizes the MatrixState variable/enumeration
  • [ ] If necessary, dynamically allocates needed attributes
  • [ ] Ignoring sorting operations, has time complexity of at most $\mathcal{O}(nnz)$
• [ ] Implement the disassembleStorage method that
  • [ ] Converts the data stored in the JDS-specific attributes defined by #6 to attribute of the base class _buildCoeff
  • [ ] Properly utilizes the MatrixState variable/enumeration
  • [ ] If necessary, deallocates needed attributes
  • [ ] Ignoring sorting operations, has time complexity of at most $\mathcal{O}(nnz)$

Definition of done:

• [ ] Code written follows the conventions used by rest of the of the library, in particular for the assembleStorage and disassembleStorage methods of the other sparse matrix types
• [ ] Code is compatible with the specifications resulting from #6
• [ ] Code containing uses of these methods compiles successfully
• [ ] These methods pass the tests specified by #54
• [ ] Code is commented and documented in a manner that allows anyone familiar with sparse matrices to understand how it works.

[NiloyGupta-UM]

@MattGranados Ready for review

[MattGranados]

Overall excellent description, list of tasks, and definition of done. The references to related issues aids in ease of understanding where to look for specifics of formatting and testing. Great work!

Comments:

1. Description can potentially be expanded; provide a little more information on what the _buildCoeff attribute entails. i.e how is data stored in this attribute?
2. Add what the name of the file containing the storage methods is. This would provide greater clarity as to where exactly these methods are being implemented.

[MattGranados]

Hi @NiloyGupta-UM have you created a pull request yet for your storage methods? Asking to make sure I can give a review

[NiloyGupta-UM]

@MattGranados Sorry, this is done so late; only just saw this message. My work was already incorporated into a previous pull request. Here is the link to my specific commit in that pull request: link