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symbfact

Symbolic factorization analysis

Syntax

Description

count = symbfact(A) returns the vector of row counts for the upper triangular Cholesky factor of a symmetric matrix whose upper triangle is that of A, assuming no cancellation during the factorization. symbfact should be much faster than chol(A).

count = symbfact(A,'col') analyzes A' *A (without forming it explicitly).

count = symbfact(A,'sym') is the same as count = symbfact(A).

[count,h,parent,post,R] = symbfact(...) has several optional return values.

h
Height of the elimination tree
parent
The elimination tree itself
post
Postordering permutation of the elimination tree
R
0-1 matrix whose structure is that of chol(A)

See Also

chol, etree, treelayout


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