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Add push method to Vector

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This commit is contained in:
shivshank 2019-01-09 21:38:58 -05:00
parent 5569850dbd
commit 3055c289c0
2 changed files with 28 additions and 0 deletions
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16
src/base/matrix.rs
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@ -859,6 +859,22 @@ impl<N: Scalar + Zero, D: DimAdd<U1>, S: Storage<N, D>> Vector<N, D, S> {
}
}
impl<N: Scalar + Zero, D: DimAdd<U1>, S: Storage<N, D>> Vector<N, D, S> {
/// Constructs a new vector of higher dimension by appending `element` to the end of `self`.
#[inline]
pub fn push(&self, element: N) -> VectorN<N, DimSum<D, U1>>
where DefaultAllocator: Allocator<N, DimSum<D, U1>> {
let len = self.len();
let hnrows = DimSum::<D, U1>::from_usize(len + 1);
let mut res = unsafe { VectorN::<N, _>::new_uninitialized_generic(hnrows, U1) };
res.generic_slice_mut((0, 0), self.data.shape())
.copy_from(self);
res[(len, 0)] = element;
res
}
}
impl<N, R: Dim, C: Dim, S> AbsDiffEq for Matrix<N, R, C, S>
where
N: Scalar + AbsDiffEq,

12
tests/core/matrix.rs
View File

@ -287,6 +287,18 @@ fn to_homogeneous() {
assert_eq!(d.to_homogeneous(), expected_d);
}
#[test]
fn push() {
let a = Vector3::new(1.0, 2.0, 3.0);
let expected_a = Vector4::new(1.0, 2.0, 3.0, 4.0);
let b = DVector::from_row_slice(3, &[1.0, 2.0, 3.0]);
let expected_b = DVector::from_row_slice(4, &[1.0, 2.0, 3.0, 4.0]);
assert_eq!(a.push(4.0), expected_a);
assert_eq!(b.push(4.0), expected_b);
}
#[test]
fn simple_add() {
let a = Matrix2x3::new(1.0, 2.0, 3.0, 4.0, 5.0, 6.0);