Here are the data structures with brief descriptions:
|buffer||Simple buffer structure |
|dmatrix||Structure for both dense and sparse matrix.|
- if the matrix is dense, then nz is set to -1 and idx, jdx are set to NULL.
- if the matrix is sparse, then nz is set to the number of non-zero elements and the coordiante is saved at idx and jdx
|pcg_status_t||Contains pcg status information |