Man Scilab

rcond Scilab Function

rcond - inverse condition number

Calling Sequence

rcond(X)

Parameters

X : real or complex square matrix

Description

rcond(X) is an estimate for the reciprocal of the condition of X in the 1-norm.

If X is well conditioned, rcond(X) is close to 1. If not, rcond(X) is close to 0.

[r,z]=rcond(X) sets r to rcond(X) and returns z such that norm(X*z,1) = r*norm(X,1)*norm(z,1)

Thus, if rcond is small z is a vector in the kernel.

Examples


A=diag([1:10]);
rcond(A)
A(1,1)=0.000001;
rcond(A)

See Also

svd , cond , inv ,