MSR

Sparse matrix in Modified Sparse Row storage format.

INTEGER :: JA( : )
REAL :: A( : )

• A(1:n) contains the diagonal of the matrix.
• A(n+2:nnz) contains the nondiagonal elements of the matrix, stored ROWWISE.
• JA(n+2:nnz) contains their column indices.
• JA(1:n+1) Contains the pointer array for the nondiagonal, elements in A(n+1:nnz) and JA(n+2:nnz), i.e., for i .LE. n+1, JA(i) points to beginning of row i in arrays A, JA.
• Here, nnz = number of nonzero elements+1.