nput/output) DOUBLE PRECISION array, dimension (LDC,M)
          On entry, the leading N-by-M part of this array must
          contain the coefficient matrix C of the equation.
          On exit, the leading N-by-M part of this array contains
          the solution matrix X of the problem.

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

  Z       (output) DOUBLE PRECISION array, dimension (LDZ,M)
          The leading M-by-M part of this array contains the
          ort