forked from M-Labs/nalgebra
56 lines
1.6 KiB
Rust
56 lines
1.6 KiB
Rust
#[cfg(feature = "arbitrary")]
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use crate::base::storage::Owned;
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#[cfg(feature = "arbitrary")]
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use quickcheck::{Arbitrary, Gen};
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use crate::base::allocator::Allocator;
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use crate::base::dimension::{Dim, Dyn};
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use crate::base::Scalar;
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use crate::base::{DefaultAllocator, OMatrix};
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use crate::linalg::givens::GivensRotation;
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use simba::scalar::ComplexField;
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/// A random orthogonal matrix.
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#[derive(Clone, Debug)]
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pub struct RandomOrthogonal<T: Scalar, D: Dim = Dyn>
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where
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DefaultAllocator: Allocator<T, D, D>,
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{
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m: OMatrix<T, D, D>,
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}
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impl<T: ComplexField, D: Dim> RandomOrthogonal<T, D>
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where
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DefaultAllocator: Allocator<T, D, D>,
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{
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/// Retrieve the generated matrix.
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pub fn unwrap(self) -> OMatrix<T, D, D> {
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self.m
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}
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/// Creates a new random orthogonal matrix from its dimension and a random reals generators.
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pub fn new<Rand: FnMut() -> T>(dim: D, mut rand: Rand) -> Self {
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let mut res = OMatrix::identity_generic(dim, dim);
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// Create an orthogonal matrix by composing random Givens rotations rotations.
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for i in 0..dim.value() - 1 {
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let rot = GivensRotation::new(rand(), rand()).0;
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rot.rotate(&mut res.fixed_rows_mut::<2>(i));
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}
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RandomOrthogonal { m: res }
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}
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}
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#[cfg(feature = "arbitrary")]
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impl<T: ComplexField + Arbitrary + Send, D: Dim> Arbitrary for RandomOrthogonal<T, D>
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where
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DefaultAllocator: Allocator<T, D, D>,
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Owned<T, D, D>: Clone + Send,
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{
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fn arbitrary(g: &mut Gen) -> Self {
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let dim = D::try_to_usize().unwrap_or(1 + usize::arbitrary(g) % 50);
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Self::new(D::from_usize(dim), || T::arbitrary(g))
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}
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}
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