spam (version 0.11)

spam.chol.NgPeyton-class: Class "spam.chol.NgPeyton"

Description

Result of a Cholesky decomposition with the NgPeyton method

Objects from the Class

Objects are created by calls of the form chol(x,method="NgPeyton", ...) and should not be created directly with a new("spam.chol.NgPeyton", ...) call. At present, no proper print method is defined. However, the factor can be transformed into a spam object.

References

Ng, E. G. and B. W. Peyton (1993), "Block sparse Cholesky algorithms on advanced uniprocessor computers", SIAM J. Sci. Comput., 14, pp. 1034-1056.

See Also

ordering and chol

Examples

x <- spam( c(4,3,0,3,5,1,0,1,4),3)
cf <- chol( x)
cf
as.spam( cf)