Example 21.7 applies precg to the matrix PRECGTEST in the software distribution. Modify precg and create the function precgomega with the following calling sequence: Rather than assuming in Equation...

Example 21.7 applies precg to the matrix PRECGTEST in the software distribution. Modify precg and create the function precgomega with the following calling sequence:

Rather than assuming
in Equation 21.22, maintain the equation as a function of
 Apply precgomega with the
 preconditioner to
 using different values of
 and see if you can improve upon the result in Example 21.7.