normal 0.7.0 normal: ^0.7.0 copied to clipboard
A simple library for working with the normal probability distribution. Includes methods for Gaussian density, cumulative probability, quantiles and random number generation.
import 'package:normal/normal.dart';
void main() {
final d = Normal(),
xs = [for (var i = 0; i < 14; i++) (i - 6) / 2],
ps = [for (var i = 1; i < 10; i++) i / 10.0];
// Probability density function.
print('\nNormal.pdf\n----------\n');
for (final x in xs) {
final p = d.pdf(x);
print(
'${x.toString().padLeft(4)} |${' ' * (p * 30).round()}:${p.toStringAsFixed(4)}');
}
// Cumulative density function.
print('\nNormal.cdf\n----------\n');
for (final x in xs) {
final p = d.cdf(x);
print(
'${x.toString().padLeft(4)} |${' ' * (p * 40).round()}:${p.toStringAsFixed(4)}');
}
// Quantile function.
print('\nNormal.inverseCdf\n-----------------\n');
for (final p in ps) {
final x = d.quantile(p);
print('${p.toStringAsFixed(1)}\t${x.toStringAsFixed(4).padLeft(7)}');
}
// Generate random numbers.
print('\nNormal.generate\n---------------\n');
for (final x in d.generate(10, seed: 0)) {
print(x.toStringAsFixed(4).padLeft(7));
}
}