rcond - inverse condition number

Calling Sequence

rcond(X)

Parameters

• X : real or complex square matrix

Description

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.

sets r to rcond(X) and returns z such that

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