DA &gt;= max(1,N).

  E       (input/output) DOUBLE PRECISION array, dimension (LDE,K),
          where K is N, RANKE, or 0, if JOBE = 'G', 'C', or 'I',
          respectively.
          On entry, if JOBE = 'G', the leading N-by-N part of this
          array must contain the descriptor matrix E of the system.
          If JOBE = 'C', the leading RANKE-by-RANKE part of this
          array must contain the full-rank block T of the descriptor
          matrix E.
          If JOBE = 'I', then E is assumed to 