rcond (MATLAB Function Reference)

Matrix reciprocal condition number estimate

c = rcond(A)

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

Algorithm

The rcond function uses the condition estimator from the LINPACK routine ZGECO.

See Also


`cond`	Condition number with respect to inversion
`condest`	1-norm matrix condition number estimate
`norm`	Vector and matrix norms
`normest`	2-norm estimate
`rank`	Rank of a matrix
`svd`	Singular value decomposition

References

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

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