umf_ludel — utility function used with umf_lufact
umf_ludel(LU_ptr) or umf_ludel()
This function must be used in conjunction with umf_lufact and umf_lusolve. It clears the internal memory space used to store the LU factors (got with umf_lufact). Use without argument it frees the memory for all the current scilab umfpack LU factors.