/src/lib/numeric/math_constants.e

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  1. -- This file is part of a Liberty Eiffel library.
    2. 

  2. -- See the full copyright at the end.
    3. 

  3. --
    4. 

  4. expanded class MATH_CONSTANTS
    5. 

  5.    --
    6. 

  6.    -- Platform-independent, universal, mathematical constants.
    7. 

  7.    -- Intended to be used as ancestor for classes that need these constants.
    8. 

  8.    --
    9. 

  9. 

  10. feature {ANY} -- Maths constants:
    11. 

  11.    Pi: REAL 3.1415926535897932384626
    12. 

  12.          -- Pi
    13. 

  13. 

  14.    Pi_2: REAL 1.5707963267948966192313
    15. 

  15.          -- Pi divided by 2
    16. 

  16. 

  17.    Pi_4: REAL 0.7853981633974483096156
    18. 

  18.          -- Pi divided by 4
    19. 

  19. 

  20.    Inv_pi: REAL 0.31830988618379067153
    21. 

  21.          -- Inverse pi
    22. 

  22. 

  23.    Sqr_2pi: REAL 2.50662827463100050241
    24. 

  24.          -- Square root of 2 pi
    25. 

  25. 

  26.    Tau: REAL 6.2831852707795864769252
    27. 

  27.          -- Tau (2Pi)
    28. 

  28. 

  29.    Sqr_tau: REAL 2.50662827463100050241
    30. 

  30.          -- Square root of Tau
    31. 

  31. 

  32.    Evalue: REAL 2.7182818284590452353602
    33. 

  33.          -- e (Euler's number)
    34. 

    35. 

  35.    Inv_evalue: REAL 0.36787944117144232159
    36. 

  36.          -- Inverse e
    37. 

  37. 

  38.    Deg: REAL 57.2957795130823208767981
    39. 

  39.          -- Degrees/Radian
    40. 

  40. 

  41.    Phi: REAL 1.6180339887498948482045
    42. 

  42.          -- Golden Ratio
    43. 

  43. 

  44.    Cheb: REAL 0.59017029950804811302
    45. 

  45.          -- Chebyshev constant
    46. 

  46. 

  47.    Zeta_2: REAL 1.64493406684822643647
    48. 

  48.          -- Riemann Function
    49. 

  49. 

  50. end -- class MATH_CONSTANTS
    51. 

  51. --
    52. 

  52. -- Copyright (C) 2009-2017: by all the people cited in the AUTHORS file.
    53. 

  53. --
    54. 

  54. -- Permission is hereby granted, free of charge, to any person obtaining a copy
    55. 

  55. -- of this software and associated documentation files (the "Software"), to deal
    56. 

  56. -- in the Software without restriction, including without limitation the rights
    57. 

  57. -- to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    58. 

  58. -- copies of the Software, and to permit persons to whom the Software is
    59. 

  59. -- furnished to do so, subject to the following conditions:
    60. 

  60. --
    61. 

  61. -- The above copyright notice and this permission notice shall be included in
    62. 

  62. -- all copies or substantial portions of the Software.
    63. 

  63. --
    64. 

  64. -- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    65. 

  65. -- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    66. 

  66. -- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    67. 

  67. -- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    68. 

  68. -- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    69. 

  69. -- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    70. 

  70. -- THE SOFTWARE.
    71.