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inverse condition number
r = rcond(X)
real or complex square matrix
real positive number
rcond(X) is an estimate for the reciprocal of the
X in the 1-norm.
X is well conditioned,
rcond(X) is close to 1.
rcond(X) is close to 0.
Estimating the 1-norm inverse condition number with
Algorithm: We compute the 1-norm of X with Lapack/DLANGE, compute its LU decomposition with Lapack/DGETRF, and finally estimate the condition with Lapack/DGECON.
A = diag([1:10]); rcond(A) A(1,1) = 0.000001; rcond(A)
|6.0.2||rcond() now yields %inf = 1/cond() instead of .|
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