Load the matrix used in an undirected graph problem. Verify it is symmetric but not positive definite, and approximate its condition number. Apply minresb with tol −6 maxiter and Using with...

Load the

matrix

used in an undirected graph problem.

Verify it is symmetric but not positive definite, and approximate its condition number.

Apply minresb with tol

⁻⁶

maxiter

and

Using

with all the other parameters the same, estimate the solution using mpregmres. Time each execution, and comment on the results.