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Kris Giesing 2015-10-23 12:02:18 -07:00
parent 739fda1af4
commit 73eae93b74
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packages/unit/test/gestures/lsq_solver_test_disabled.dart
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import 'package:flutter/gestures.dart';
import 'package:test/test.dart';
void main() {
void printFit(PolynomialFit fit) {
print("Confidence: " + fit.confidence.toString());
for (int i = 0; i < fit.coefficients.length; i++)
print(i.toString() + ": " + fit.coefficients[i].toString());
}
approx(double value, double expectation) {
const double eps = 1e-6;
return (value - expectation).abs() < eps;
}
test('Least-squares fit: linear polynomial to line', () {
List<double> x = [0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0];
List<double> y = [1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0];
List<double> w = [1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0];
LeastSquaresSolver solver = new LeastSquaresSolver(x, y, w);
PolynomialFit fit = solver.solve(1);
expect(fit.coefficients.length, 2);
expect(approx(fit.coefficients[0], 1.0), isTrue);
expect(approx(fit.coefficients[1], 0.0), isTrue);
expect(approx(fit.confidence, 1.0), isTrue);
});
test('Least-squares fit: linear polynomial to sloped line', () {
List<double> x = [0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0];
List<double> y = [1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0];
List<double> w = [1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0];
LeastSquaresSolver solver = new LeastSquaresSolver(x, y, w);
PolynomialFit fit = solver.solve(1);
expect(fit.coefficients.length, 2);
expect(approx(fit.coefficients[0], 1.0), isTrue);
expect(approx(fit.coefficients[1], 1.0), isTrue);
expect(approx(fit.confidence, 1.0), isTrue);
});
test('Least-squares fit: quadratic polynomial to line', () {
List<double> x = [0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0];
List<double> y = [1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0];
List<double> w = [1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0];
LeastSquaresSolver solver = new LeastSquaresSolver(x, y, w);
PolynomialFit fit = solver.solve(2);
expect(fit.coefficients.length, 3);
expect(approx(fit.coefficients[0], 1.0), isTrue);
expect(approx(fit.coefficients[1], 0.0), isTrue);
expect(approx(fit.coefficients[2], 0.0), isTrue);
expect(approx(fit.confidence, 1.0), isTrue);
});
test('Least-squares fit: quadratic polynomial to sloped line', () {
List<double> x = [0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0];
List<double> y = [1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0];
List<double> w = [1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0];
LeastSquaresSolver solver = new LeastSquaresSolver(x, y, w);
PolynomialFit fit = solver.solve(2);
expect(fit.coefficients.length, 3);
expect(approx(fit.coefficients[0], 1.0), isTrue);
expect(approx(fit.coefficients[1], 1.0), isTrue);
expect(approx(fit.coefficients[2], 0.0), isTrue);
expect(approx(fit.confidence, 1.0), isTrue);
});
}