        If INFO = 0, the leading N-by-N part of this array
          contains the solution matrix X of the problem.

  LDX     INTEGER
          The leading dimension of array X.  LDX &gt;= MAX(1,N).

  ALFAR   (output) DOUBLE PRECISION array, dimension (2*N)
  ALFAI   (output) DOUBLE PRECISION array, dimension (2*N)
  BETA    (output) DOUBLE PRECISION array, dimension (2*N)
          The generalized eigenvalues of the 2N-by-2N matrix pair,
          ordered as specified by SORT (if INFO = 0, or INFO &gt;= 