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disnan

  1. C DISNAN    SOURCE    FANDEUR   22/05/02    21:15:06     11359          
  2. *> \brief \b DISNAN tests input for NaN.
  3. *
  4. *  =========== DOCUMENTATION ===========
  5. *
  6. * Online html documentation available at
  7. *            http://www.netlib.org/lapack/explore-html/
  8. *
  9. *> \htmlonly
  10. *> Download DISNAN + dependencies
  11. *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/disnan.f">
  12. *> [TGZ]</a>
  13. *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/disnan.f">
  14. *> [ZIP]</a>
  15. *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/disnan.f">
  16. *> [TXT]</a>
  17. *> \endhtmlonly
  18. *
  19. *  Definition:
  20. *  ===========
  21. *
  22. *       LOGICAL FUNCTION DISNAN( DIN )
  23. *
  24. *       .. Scalar Arguments ..
  25. *       REAL*8   DIN
  26. *       ..
  27. *
  28. *
  29. *> \par Purpose:
  30. *  =============
  31. *>
  32. *> \verbatim
  33. *>
  34. *> DISNAN returns .TRUE. if its argument is NaN, and .FALSE.
  35. *> otherwise.  To be replaced by the Fortran 2003 intrinsic in the
  36. *> future.
  37. *> \endverbatim
  38. *
  39. *  Arguments:
  40. *  ==========
  41. *
  42. *> \param[in] DIN
  43. *> \verbatim
  44. *>          DIN is DOUBLE PRECISION
  45. *>          Input to test for NaN.
  46. *> \endverbatim
  47. *
  48. *  Authors:
  49. *  ========
  50. *
  51. *> \author Univ. of Tennessee
  52. *> \author Univ. of California Berkeley
  53. *> \author Univ. of Colorado Denver
  54. *> \author NAG Ltd.
  55. *
  56. *> \date June 2017
  57. *
  58. *> \ingroup OTHERauxiliary
  59. *
  60. *  =====================================================================
  61.       LOGICAL FUNCTION DISNAN( DIN )
  62. *
  63. *  -- LAPACK auxiliary routine (version 3.7.1) --
  64. *  -- LAPACK is a software package provided by Univ. of Tennessee,    --
  65. *  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
  66. *     June 2017
  67. *
  68. *     .. Scalar Arguments ..
  69.       REAL*8   DIN
  70. *     ..
  71. *
  72. *  =====================================================================
  73. *
  74. *  .. External Functions ..
  75.       LOGICAL  DLAISNAN
  76.       EXTERNAL DLAISNAN
  77. *  ..
  78. *  .. Executable Statements ..
  79.       DISNAN = DLAISNAN(DIN,DIN)
  80.  
  81.       RETURN
  82.       END
  83.  
  84.  
  85.  

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