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    1:       LOGICAL FUNCTION DISNAN(DIN)
    2: *
    3: *  -- LAPACK auxiliary routine (version 3.2) --
    4: *  -- LAPACK is a software package provided by Univ. of Tennessee,    --
    5: *  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
    6: *     November 2006
    7: *
    8: *     .. Scalar Arguments ..
    9:       DOUBLE PRECISION DIN
   10: *     ..
   11: *
   12: *  Purpose
   13: *  =======
   14: *
   15: *  DISNAN returns .TRUE. if its argument is NaN, and .FALSE.
   16: *  otherwise.  To be replaced by the Fortran 2003 intrinsic in the
   17: *  future.
   18: *
   19: *  Arguments
   20: *  =========
   21: *
   22: *  DIN      (input) DOUBLE PRECISION
   23: *          Input to test for NaN.
   24: *
   25: *  =====================================================================
   26: *
   27: *  .. External Functions ..
   28:       LOGICAL DLAISNAN
   29:       EXTERNAL DLAISNAN
   30: *  ..
   31: *  .. Executable Statements ..
   32:       DISNAN = DLAISNAN(DIN,DIN)
   33:       RETURN
   34:       END