| MATLAB Function Reference | |
Symbolic factorization analysis
Syntax
count = symbfact(A) count = symbfact(A,'col') count = symbfact(A,'sym') [count,h,parent,post,R] = symbfact(...)
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
| | symamd | symmlq | |