pbdDMAT (version 0.2-3)

kappa: Compute or estimate the Condition Number of a Distributed Matrix

Description

Computes or estimates the condition number.

Usage

## S3 method for class 'ddmatrix':
kappa(z, exact = FALSE, norm = NULL,
                           method = c("qr", "direct"), ...)
## S3 method for class 'ddmatrix':
rcond(x, norm = c("O", "I", "1"), 
                           triangular = FALSE, ...)

Arguments

x,z

numeric distributed matrices.

exact

logical. Determines whether exact condition number or approximation should be computed.

norm

character. Determines which matrix norm is to be used.

method

character. Determines the method use in computing condition number.

triangular

logical. If true, only the lower triangle is used.

...

Extra arguments.

Value

• Returns a number.

See Also

Norm

Examples

# Save code in a file "demo.r" and run with 2 processors by
# > mpiexec -np 2 Rscript demo.r

library(pbdDMAT, quiet = TRUE)
init.grid()

comm.set.seed(diff=T)
x <- ddmatrix("rnorm", 10, 10)

cnm <- rcond(x)

comm.print(cnm)

finalize()