rcond

Purpose

Matrix condition number estimate.

Synopsis

c = rcond(X)

Description

rcond(X) is an estimate for the reciprocal of the condition of X in 1-norm using the LINPACK condition estimator. If X is well conditioned, rcond(X) is near 1.0. If X is badly conditioned, rcond(X) is near 0.0. Compared to cond, rcond is a more efficient, but less reliable, method of estimating the condition of a matrix.

Algorithm

rcond uses the condition estimator from the LINPACK routine ZGECO.

See Also

cond, condest, norm, normest, rank, svd

References

[1] J.J. Dongarra, J.R. Bunch, C.B. Moler, and G.W. Stewart, LINPACK
User's Guide, SIAM, Philadelphia, 1979.

(c) Copyright 1994 by The MathWorks, Inc.