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Add zip_zip_map to map on three matrices simultaneously.

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sebcrozet 2018-09-22 15:38:33 +02:00 committed by Sébastien Crozet
parent 787d20cff4
commit a03fd6bff7
1 changed files with 36 additions and 0 deletions
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36
src/base/matrix.rs
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@ -393,6 +393,42 @@ impl<N: Scalar, R: Dim, C: Dim, S: Storage<N, R, C>> Matrix<N, R, C, S> {
res
}
/// Returns a matrix containing the result of `f` applied to each entries of `self` and
/// `b`, and `c`.
#[inline]
pub fn zip_zip_map<N2, N3, N4, S2, S3, F>(&self, b: &Matrix<N2, R, C, S2>, c: &Matrix<N3, R, C, S3>, mut f: F) -> MatrixMN<N4, R, C>
where
N2: Scalar,
N3: Scalar,
N4: Scalar,
S2: Storage<N2, R, C>,
S3: Storage<N3, R, C>,
F: FnMut(N, N2, N3) -> N4,
DefaultAllocator: Allocator<N4, R, C>,
{
let (nrows, ncols) = self.data.shape();
let mut res = unsafe { MatrixMN::new_uninitialized_generic(nrows, ncols) };
assert!(
(nrows.value(), ncols.value()) == b.shape() && (nrows.value(), ncols.value()) == c.shape(),
"Matrix simultaneous traversal error: dimension mismatch."
);
for j in 0..ncols.value() {
for i in 0..nrows.value() {
unsafe {
let a = *self.data.get_unchecked(i, j);
let b = *b.data.get_unchecked(i, j);
let c = *c.data.get_unchecked(i, j);
*res.data.get_unchecked_mut(i, j) = f(a, b, c)
}
}
}
res
}
/// Transposes `self` and store the result into `out`.
#[inline]
pub fn transpose_to<R2, C2, SB>(&self, out: &mut Matrix<N, R2, C2, SB>)