forked from M-Labs/nalgebra
19 lines
631 B
Rust
19 lines
631 B
Rust
use nalgebra::DVector;
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#[test]
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fn test_variance_catastrophic_cancellation() {
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let long_repeating_vector = DVector::repeat(10_000, 100000000.0);
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assert_eq!(long_repeating_vector.variance(), 0.0);
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let short_vec = DVector::from_vec(vec![1., 2., 3.]);
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assert_eq!(short_vec.variance(), 2.0 / 3.0);
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let short_vec =
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DVector::<f64>::from_vec(vec![1.0e8 + 4.0, 1.0e8 + 7.0, 1.0e8 + 13.0, 1.0e8 + 16.0]);
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assert_eq!(short_vec.variance(), 22.5);
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let short_vec =
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DVector::<f64>::from_vec(vec![1.0e9 + 4.0, 1.0e9 + 7.0, 1.0e9 + 13.0, 1.0e9 + 16.0]);
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assert_eq!(short_vec.variance(), 22.5);
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}
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