chfact

Arguments

A

square symmetric positive sparse matrix

spcho

list containing the Cholesky factors in coded form

Description

spcho=chfact(A) computes the sparse Cholesky factors of sparse matrix A, assumed symmetric positive definite. This function is based on the Ng-Peyton programs (ORNL). See the Fortran programs for a complete description of the variables in spcho. This function is to be used with chsolve.

Examples

A=sprand(20,20,0.1);
A=A*A'+eye();
chfact(A)

sol=(1:20)';
rhs=A*sol;
chfact(A)

See also

• chsolve — sparse Cholesky solver
• sparse — sparse matrix definition
• lufact — sparse lu factorization
• luget — extraction of sparse LU factors
• spchol — sparse cholesky factorization