Modify eigssymb so it computes either the nev largest or the nev smallest eigenvalues of a large sparse symmetric matrix by adding a parameter, direction, that has values or Name the function...

Modify eigssymb so it computes either the nev largest or the nev smallest eigenvalues of a large sparse symmetric matrix by adding a parameter, direction, that has values
or
Name the function eigssymb2. Test your implementation by finding the six largest and the six smallest eigenvalues of the symmetric matrices
.mat and Andrews.mat in the software distribution. You will need to experiment with
 and maxiter to obtain satisfactory results.