rcond
Builtin Function
[1mSynopsis[0m
Condition number.
[1mSyntax[0m
rcond( [4mA[24m )
[1mDescription[0m
Rcond computes an estimate of the condition number of the input
matrix, [4mA[24m. rcond() uses the LAPACK routines DGECON, or ZGECON.
Probably the most published way to compute the condition of a
matrix is:
Kcond = ||A|| * ||inv(A)||
Another method is to use the 1st and last singular values of A:
Kcond = sigma(1)/sigma(n)
rcond computes an ESTIMATE of the condition number without
computing all of the columns of inv(A). For more information see
the LAPACK User's Guide.
See Also inv, det, lu