Module: StandardDeviation

Defined in:
lib/standard_deviation/version.rb,
ext/standard_deviation/standard_deviation.c

Constant Summary collapse

VERSION = 
"1.0.3"

Instance Method Summary collapse

Instance Method Details

#population_variance ⇒ Object 



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# File 'ext/standard_deviation/standard_deviation.c', line 54

static VALUE population_variance(VALUE self) {
  long size = RARRAY_LEN(self);
  VALUE *array = RARRAY_PTR(self);

  if (size < 2) raise_not_enough_elements();

  return rb_float_new(compute_population_variance(array, size));
}

#sample_variance ⇒ Object Also known as: variance 



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# File 'ext/standard_deviation/standard_deviation.c', line 45

static VALUE sample_variance(VALUE self) {
  long size = RARRAY_LEN(self);
  VALUE *array = RARRAY_PTR(self);

  if (size < 2) raise_not_enough_elements();

  return rb_float_new(compute_sample_variance(array, size));
}

#stdev ⇒ Object Also known as: standard_deviation 



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# File 'ext/standard_deviation/standard_deviation.c', line 63

static VALUE stdev(VALUE self) {
  long size = RARRAY_LEN(self);
  VALUE *array = RARRAY_PTR(self);

  if (size < 2) raise_not_enough_elements();

  return rb_float_new(sqrt(compute_sample_variance(array, size)));
}

#stdevp ⇒ Object 



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# File 'ext/standard_deviation/standard_deviation.c', line 72

static VALUE stdevp(VALUE self) {
  long size = RARRAY_LEN(self);
  VALUE *array = RARRAY_PTR(self);

  if (size < 2) raise_not_enough_elements();

  return rb_float_new(sqrt(compute_population_variance(array, size)));
}