1. The software distribution contains a MATLAB sparse matrix file for each of three matrices: mat Si.mat west0479.mat Solve each system as best you can without preconditioning. Then solve each...

1.

The software distribution contains a MATLAB sparse matrix file for each of three matrices:

mat

Si.mat

west0479.mat

Solve each system as best you can without preconditioning. Then solve each system using preconditioning.

2.

Using the statement A = sprandsym(2000,0.05,.01), create a

symmetric indefinite matrix with a condition number of

Solve the system using minresb.

Using A = sprandsym(2000,0.05,.001), create a symmetric indefinite matrix with a condition number of

Solve the system using both minresb and mpregmres. Use

and tol

⁻⁶