utility function used with lufact
ludel(hand)
:hand handle to sparse lu factors (output of lufact) :
This function is used in conjunction with lufact. It clears the internal memory space used to store the result of lufact.
The sequence of commands [p,r]=lufact(A);x=lusolve(p,b);ludel(p); solves the sparse linear system A*x = b and clears p.