Module: Dispersion
- Included in:
- Array
- Defined in:
- ext/ruby_native_statistics/ruby_native_statistics.c
Instance Method Summary collapse
- #percentile(r_percentile) ⇒ Object
- #stdev ⇒ Object
- #stdevp ⇒ Object
- #stdevs ⇒ Object
- #var ⇒ Object
- #varp ⇒ Object
Instance Method Details
#percentile(r_percentile) ⇒ Object
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# File 'ext/ruby_native_statistics/dispersion.c', line 67
VALUE rb_percentile(VALUE self, VALUE r_percentile)
{
double result;
Check_Type(self, T_ARRAY);
long array_length = rb_array_len(self);
double percentile = NUM2DBL(r_percentile);
if (array_length == 0)
{
rb_raise(rb_eRangeError, "array must have at least one element");
}
if (percentile < 0 || percentile > 1)
{
rb_raise(rb_eRangeError, "percentile must be between 0 and 1 inclusive");
}
double *sorted_array = sorted_ruby_array(self, array_length);
double h = (array_length - 1) * percentile + 1;
if (trunc(h) == h)
{
result = sorted_array[(long)h - 1];
}
else
{
long h_floor = (long)trunc(h);
result = (h - h_floor) * (sorted_array[h_floor] - sorted_array[h_floor - 1]) + sorted_array[h_floor - 1];
}
free(sorted_array);
return DBL2NUM(result);
}
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#stdev ⇒ Object
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# File 'ext/ruby_native_statistics/dispersion.c', line 3
VALUE rb_sample_standard_deviation(VALUE self)
{
unsigned int array_length;
Check_Type(self, T_ARRAY);
array_length = rb_long2int(RARRAY_LEN(self));
if (array_length <= 1)
{
rb_raise(rb_eRangeError, "array must have more than one element");
}
return DBL2NUM(sqrt((calculate_total_distance_from_mean(self, array_length) / (array_length - 1))));
}
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#stdevp ⇒ Object
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# File 'ext/ruby_native_statistics/dispersion.c', line 35
VALUE rb_population_standard_deviation(VALUE self)
{
unsigned int array_length;
Check_Type(self, T_ARRAY);
array_length = rb_long2int(RARRAY_LEN(self));
if (array_length <= 1)
{
rb_raise(rb_eRangeError, "array must have more than one element");
}
return DBL2NUM(sqrt(calculate_total_distance_from_mean(self, array_length) / array_length));
}
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#stdevs ⇒ Object
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# File 'ext/ruby_native_statistics/dispersion.c', line 3
VALUE rb_sample_standard_deviation(VALUE self)
{
unsigned int array_length;
Check_Type(self, T_ARRAY);
array_length = rb_long2int(RARRAY_LEN(self));
if (array_length <= 1)
{
rb_raise(rb_eRangeError, "array must have more than one element");
}
return DBL2NUM(sqrt((calculate_total_distance_from_mean(self, array_length) / (array_length - 1))));
}
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#var ⇒ Object
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# File 'ext/ruby_native_statistics/dispersion.c', line 19
VALUE rb_sample_variance(VALUE self)
{
unsigned int array_length;
Check_Type(self, T_ARRAY);
array_length = rb_long2int(RARRAY_LEN(self));
if (array_length <= 1)
{
rb_raise(rb_eRangeError, "array must have more than one element");
}
return DBL2NUM((calculate_total_distance_from_mean(self, array_length) / (array_length - 1)));
}
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#varp ⇒ Object
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# File 'ext/ruby_native_statistics/dispersion.c', line 51
VALUE rb_population_variance(VALUE self)
{
unsigned int array_length;
Check_Type(self, T_ARRAY);
array_length = rb_long2int(RARRAY_LEN(self));
if (array_length <= 1)
{
rb_raise(rb_eRangeError, "array must have more than one element");
}
return DBL2NUM(calculate_total_distance_from_mean(self, array_length) / array_length);
}
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