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  1. C DISNAN SOURCE BP208322 18/07/10 21:15:03 9872
  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 DLAISN
  76. EXTERNAL DLAISN
  77. * ..
  78. * .. Executable Statements ..
  79. DISNAN = DLAISN(DIN,DIN)
  80. RETURN
  81. END
  82.  
  83.  
  84.  

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