Data Structures

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