lib/standard/math.nit

   1 # This file is part of NIT ( http://www.nitlanguage.org ).
   2 #
   3 # Copyright 2004-2008 Jean Privat <jean@pryen.org>
   4 #
   5 # This file is free software, which comes along with NIT.  This software is
   6 # distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
   7 # without  even  the implied warranty of  MERCHANTABILITY or  FITNESS FOR A
   8 # PARTICULAR PURPOSE.  You can modify it is you want,  provided this header
   9 # is kept unaltered, and a notification of the changes is added.
  10 # You  are  allowed  to  redistribute it and sell it, alone or is a part of
  11 # another product.
  12
  13 # Mathematical operations
  14 package math
  15
  16 import kernel
  17 import collection
  18
  19 redef class Int
  20         fun rand: Int is extern "kernel_Int_Int_rand_0"
  21 end
  22
  23 redef class Float
  24         fun sqrt: Float is extern "kernel_Float_Float_sqrt_0"
  25         fun cos: Float is extern "kernel_Float_Float_cos_0"
  26         fun sin: Float is extern "kernel_Float_Float_sin_0"
  27         fun tan: Float is extern "kernel_Float_Float_tan_0"
  28         fun acos: Float is extern "kernel_Float_Float_acos_0"
  29         fun asin: Float is extern "kernel_Float_Float_asin_0"
  30         fun atan: Float is extern "kernel_Float_Float_atan_0"
  31
  32         fun pow(e: Float): Float is extern "kernel_Float_Float_pow_1"
  33         fun log: Float is extern "kernel_Float_Float_log_0"
  34         fun exp: Float is extern "kernel_Float_Float_exp_0"
  35
  36         fun rand: Float is extern "kernel_Float_Float_rand_0"
  37         fun hypot_with( b : Float ) : Float is extern "hypotf"
  38 end
  39
  40 redef class Collection[ E ]
  41         # Return a random element in the collection
  42         fun rand : nullable E
  43         do
  44                 if is_empty then return null
  45
  46                 var rand_index = length.rand
  47                 var picked : nullable E = null
  48
  49                 iterate !each( e ) do
  50                         if rand_index == 0
  51                         then
  52                                 picked = e
  53                                 break
  54                         else
  55                                 rand_index -= 1
  56                         end
  57                 end
  58
  59                 return picked
  60         end
  61 end
  62
  63 fun atan2(x: Float, y: Float): Float is extern "kernel_Any_Any_atan2_2"
  64 fun pi: Float is extern "kernel_Any_Any_pi_0"
  65 fun srand_from(x: Int) is extern "kernel_Any_Any_srand_from_1"
  66 fun srand is extern "kernel_Any_Any_srand_0"