Incomplete Cholesky factorization
L = ichol(A)
L = ichol(A,opts)
L = ichol(
performs
the incomplete Cholesky factorization of A
)A
with
zerofill.
L = ichol(
performs
the incomplete Cholesky factorization of A
,opts
)A
with
options specified by opts
.
By default, ichol
references the lower
triangle of A
and produces lower triangular factors.

Sparse matrix  

Structure with up to five fields:

[1] Saad, Yousef. "Preconditioning Techniques." Iterative Methods for Sparse Linear Systems. PWS Publishing Company, 1996.
[2] Manteuffel, T.A. "An incomplete factorization technique for positive definite linear systems." Math. Comput. 34, 473–497, 1980.