On entry: the
by
matrix
.
This is stored as a notional two-dimensional array with row elements or column elements stored contiguously. The storage of elements
, for row
and column
, depends on the
order argument as follows:
- if , is stored as ;
- if , is stored as .
See
Section 9 in nag_zgbsv (f07bnc) for further details.
On exit:
ab is overwritten by details of the factorization.
The elements, , of the upper triangular band factor with super-diagonals, and the multipliers, , used to form the lower triangular factor are stored. The elements , for and , and , for and , are stored where is stored on entry.