Iterative refinement is used to obtain an C error estimate.
C ment is used only to obtain an estimate of the accuracy. C IND estimates the accuracy of the solution only when the C input matrix and the right hand side are represented C exactly in the computer and does not take into account C any errors in the input data. Only the C upper triangle, including the diagonal, of the C coefficient matrix need be entered. A is not C altered by the routine. A is factored and then the C linear equation is solved.