Module: Mathematics

Included in:
Array
Defined in:
ext/ruby_native_statistics/ruby_native_statistics.c

Instance Method Summary collapse

Instance Method Details

#mean ⇒ Object 



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# File 'ext/ruby_native_statistics/mathematics.c', line 36

VALUE rb_mean(VALUE self)
{
  unsigned int array_length;

  Check_Type(self, T_ARRAY);

  array_length = rb_long2int(RARRAY_LEN(self));

  if (array_length <= 0)
  {
    rb_raise(rb_eRangeError, "array must have at least one element");
  }

  return DBL2NUM(calculate_mean(self, array_length));
}

#median ⇒ Object 



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# File 'ext/ruby_native_statistics/mathematics.c', line 52

VALUE rb_median(VALUE self)
{
  unsigned long array_length;

  VALUE result;

  Check_Type(self, T_ARRAY);

  array_length = RARRAY_LEN(self);

  if (array_length <= 0)
  {
    rb_raise(rb_eRangeError, "array must have at least one element");
  }

  bool array_even_size = (array_length % 2) == 0;
  unsigned long middle = (long)floor(array_length / 2.0);

  double *working_array = sorted_ruby_array(self, array_length);

  if (!array_even_size)
  {
    result = DBL2NUM(working_array[middle]);
  }
  else
  {
    result = DBL2NUM((working_array[middle - 1] + working_array[middle]) / 2);
  }

  free(working_array);

  return result;
}