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Add horizontal and vertical resizing for dynamic matrices and vectors.

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sebcrozet 2019-01-29 12:03:48 +01:00
parent 9fbdedb942
commit a7ab61f974
1 changed files with 77 additions and 0 deletions
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77
src/base/edition.rs
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@ -1,6 +1,7 @@
use num::{One, Zero};
use std::cmp;
use std::ptr;
use std::mem;
use base::allocator::{Allocator, Reallocator};
use base::constraint::{DimEq, SameNumberOfColumns, SameNumberOfRows, ShapeConstraint};
@ -549,6 +550,29 @@ impl<N: Scalar, R: Dim, C: Dim, S: Storage<N, R, C>> Matrix<N, R, C, S> {
self.resize_generic(Dynamic::new(new_nrows), Dynamic::new(new_ncols), val)
}
/// Resizes this matrix vertically, i.e., so that it contains `new_nrows` rows while keeping the same number of columns.
///
/// The values are copied such that `self[(i, j)] == result[(i, j)]`. If the result has more
/// rows than `self`, then the extra rows are filled with `val`.
#[cfg(any(feature = "std", feature = "alloc"))]
pub fn resize_vertically(self, new_nrows: usize, val: N) -> MatrixMN<N, Dynamic, C>
where DefaultAllocator: Reallocator<N, R, C, Dynamic, C> {
let ncols = self.data.shape().1;
self.resize_generic(Dynamic::new(new_nrows), ncols, val)
}
/// Resizes this matrix horizontally, i.e., so that it contains `new_ncolumns` columns while keeping the same number of columns.
///
/// The values are copied such that `self[(i, j)] == result[(i, j)]`. If the result has more
/// columns than `self`, then the extra columns are filled with `val`.
#[cfg(any(feature = "std", feature = "alloc"))]
pub fn resize_horizontally(self, new_ncols: usize, val: N) -> MatrixMN<N, R, Dynamic>
where DefaultAllocator: Reallocator<N, R, C, R, Dynamic> {
let nrows = self.data.shape().0;
self.resize_generic(nrows, Dynamic::new(new_ncols), val)
}
/// Resizes this matrix so that it contains `R2::value()` rows and `C2::value()` columns.
///
/// The values are copied such that `self[(i, j)] == result[(i, j)]`. If the result has more
@ -626,6 +650,59 @@ impl<N: Scalar, R: Dim, C: Dim, S: Storage<N, R, C>> Matrix<N, R, C, S> {
}
}
impl<N: Scalar> DMatrix<N> {
/// Resizes this matrix in-place.
///
/// The values are copied such that `self[(i, j)] == result[(i, j)]`. If the result has more
/// rows and/or columns than `self`, then the extra rows or columns are filled with `val`.
///
/// Defined only for owned fully-dynamic matrices, i.e., `DMatrix`.
#[cfg(any(feature = "std", feature = "alloc"))]
pub fn resize_mut(&mut self, new_nrows: usize, new_ncols: usize, val: N)
where DefaultAllocator: Reallocator<N, Dynamic, Dynamic, Dynamic, Dynamic> {
let placeholder = unsafe { Self::new_uninitialized(0, 0) };
let old = mem::replace(self, placeholder);
let new = old.resize(new_nrows, new_ncols, val);
let _ = mem::replace(self, new);
}
}
impl<N: Scalar, C: Dim> MatrixMN<N, Dynamic, C>
where DefaultAllocator: Allocator<N, Dynamic, C> {
/// Changes the number of rows of this matrix in-place.
///
/// The values are copied such that `self[(i, j)] == result[(i, j)]`. If the result has more
/// rows than `self`, then the extra rows are filled with `val`.
///
/// Defined only for owned matrices with a dynamic number of rows (for example, `DVector`).
#[cfg(any(feature = "std", feature = "alloc"))]
pub fn resize_vertically_mut(&mut self, new_nrows: usize, val: N)
where DefaultAllocator: Reallocator<N, Dynamic, C, Dynamic, C> {
let placeholder = unsafe { Self::new_uninitialized_generic(Dynamic::new(0), self.data.shape().1) };
let old = mem::replace(self, placeholder);
let new = old.resize_vertically(new_nrows, val);
let _ = mem::replace(self, new);
}
}
impl<N: Scalar, R: Dim> MatrixMN<N, R, Dynamic>
where DefaultAllocator: Allocator<N, R, Dynamic> {
/// Changes the number of column of this matrix in-place.
///
/// The values are copied such that `self[(i, j)] == result[(i, j)]`. If the result has more
/// columns than `self`, then the extra columns are filled with `val`.
///
/// Defined only for owned matrices with a dynamic number of columns (for example, `DVector`).
#[cfg(any(feature = "std", feature = "alloc"))]
pub fn resize_horizontally_mut(&mut self, new_ncols: usize, val: N)
where DefaultAllocator: Reallocator<N, R, Dynamic, R, Dynamic> {
let placeholder = unsafe { Self::new_uninitialized_generic(self.data.shape().0, Dynamic::new(0)) };
let old = mem::replace(self, placeholder);
let new = old.resize_horizontally(new_ncols, val);
let _ = mem::replace(self, new);
}
}
unsafe fn compress_rows<N: Scalar>(
data: &mut [N],
nrows: usize,