ZLACON(3)      LAPACK routine of NEC Numeric Library Collection      ZLACON(3)



NAME
       ZLACON

SYNOPSIS
       SUBROUTINE ZLACON (N, V, X, EST, KASE)



PURPOSE
            ZLACON estimates the 1-norm of a square, complex matrix A.
            Reverse communication is used for evaluating matrix-vector products.




ARGUMENTS
           N         (input)
                     N is INTEGER
                    The order of the matrix.  N >= 1.

           V         (output)
                     V is COMPLEX*16 array, dimension (N)
                    On the final return, V = A*W,  where  EST = norm(V)/norm(W)
                    (W is not returned).

           X         (input/output)
                     X is COMPLEX*16 array, dimension (N)
                    On an intermediate return, X should be overwritten by
                          A * X,   if KASE=1,
                          A**H * X,  if KASE=2,
                    where A**H is the conjugate transpose of A, and ZLACON must be
                    re-called with all the other parameters unchanged.

           EST       (input/output)
                     EST is DOUBLE PRECISION
                    On entry with KASE = 1 or 2 and JUMP = 3, EST should be
                    unchanged from the previous call to ZLACON.
                    On exit, EST is an estimate (a lower bound) for norm(A).

           KASE      (input/output)
                     KASE is INTEGER
                    On the initial call to ZLACON, KASE should be 0.
                    On an intermediate return, KASE will be 1 or 2, indicating
                    whether X should be overwritten by A * X  or A**H * X.
                    On the final return from ZLACON, KASE will again be 0.



LAPACK routine                  31 October 2017                      ZLACON(3)