Trait rulinalg::matrix::BaseMatrix
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[src]
pub trait BaseMatrix<T>: Sized { fn rows(&self) -> usize; fn cols(&self) -> usize; fn row_stride(&self) -> usize; fn as_ptr(&self) -> *const T; fn is_empty(&self) -> bool { ... } fn as_slice(&self) -> MatrixSlice<T> { ... } unsafe fn get_unchecked(&self, index: [usize; 2]) -> &T { ... } fn col(&self, index: usize) -> Column<T> { ... } unsafe fn col_unchecked(&self, index: usize) -> Column<T> { ... } fn row(&self, index: usize) -> Row<T> { ... } unsafe fn row_unchecked(&self, index: usize) -> Row<T> { ... } fn iter<'a>(&self) -> SliceIter<'a, T> where T: 'a { ... } fn col_iter(&self) -> Cols<T> { ... } fn row_iter(&self) -> Rows<T> { ... } fn diag_iter(&self, k: DiagOffset) -> Diagonal<T, Self> { ... } fn sum_rows(&self) -> Vector<T> where T: Copy + Zero + Add<T, Output=T> { ... } fn sum_cols(&self) -> Vector<T> where T: Copy + Zero + Add<T, Output=T> { ... } fn norm<N: MatrixNorm<T, Self>>(&self, norm: N) -> T where T: Float { ... } fn metric<'a, 'b, B, M>(&'a self, mat: &'b B, metric: M) -> T where B: 'b + BaseMatrix<T>, M: MatrixMetric<'a, 'b, T, Self, B> { ... } fn sum(&self) -> T where T: Copy + Zero + Add<T, Output=T> { ... } fn min(&self, axis: Axes) -> Vector<T> where T: Copy + PartialOrd { ... } fn max(&self, axis: Axes) -> Vector<T> where T: Copy + PartialOrd { ... } fn into_matrix(self) -> Matrix<T> where T: Copy { ... } fn select_rows<'a, I>(&self, rows: I) -> Matrix<T> where T: Copy,
I: IntoIterator<Item=&'a usize>,
I::IntoIter: ExactSizeIterator + Clone { ... } fn select_cols<'a, I>(&self, cols: I) -> Matrix<T> where T: Copy,
I: IntoIterator<Item=&'a usize>,
I::IntoIter: ExactSizeIterator + Clone { ... } fn elemul(&self, m: &Self) -> Matrix<T> where T: Copy + Mul<T, Output=T> { ... } fn elediv(&self, m: &Self) -> Matrix<T> where T: Copy + Div<T, Output=T> { ... } fn select(&self, rows: &[usize], cols: &[usize]) -> Matrix<T> where T: Copy { ... } fn hcat<S>(&self, m: &S) -> Matrix<T> where T: Copy, S: BaseMatrix<T> { ... } fn vcat<S>(&self, m: &S) -> Matrix<T> where T: Copy, S: BaseMatrix<T> { ... } fn diag(&self) -> Diagonal<T, Self> { ... } fn transpose(&self) -> Matrix<T> where T: Copy { ... } fn is_diag(&self) -> bool where T: Zero + PartialEq { ... } fn solve_u_triangular(&self, y: Vector<T>) -> Result<Vector<T>, Error> where T: Any + Float { ... } fn solve_l_triangular(&self, y: Vector<T>) -> Result<Vector<T>, Error> where T: Any + Float { ... } fn split_at(&self,
mid: usize,
axis: Axes)
-> (MatrixSlice<T>, MatrixSlice<T>) { ... } fn sub_slice<'a>(&self,
start: [usize; 2],
rows: usize,
cols: usize)
-> MatrixSlice<'a, T> where T: 'a { ... } }
Trait for immutable matrix structs.
Required Methods
fn rows(&self) -> usize
Rows in the matrix.
fn cols(&self) -> usize
Columns in the matrix.
fn row_stride(&self) -> usize
Row stride in the matrix.
fn as_ptr(&self) -> *const T
Top left index of the matrix.
Provided Methods
fn is_empty(&self) -> bool
Returns true if the matrix contais no elements
fn as_slice(&self) -> MatrixSlice<T>
Returns a MatrixSlice
over the whole matrix.
Examples
use rulinalg::matrix::{Matrix, BaseMatrix}; let a = Matrix::new(3, 3, vec![2.0; 9]); let b = a.as_slice();
unsafe fn get_unchecked(&self, index: [usize; 2]) -> &T
Get a reference to a point in the matrix without bounds checking.
fn col(&self, index: usize) -> Column<T>
Returns the column of a matrix at the given index.
None
if the index is out of bounds.
Examples
use rulinalg::matrix::{Matrix, BaseMatrix}; let mat = matrix![0, 1, 2; 3, 4, 5; 6, 7, 8]; let col = mat.col(1); let expected = matrix![1usize; 4; 7]; assert_matrix_eq!(*col, expected);
Panics
Will panic if the column index is out of bounds.
unsafe fn col_unchecked(&self, index: usize) -> Column<T>
Returns the column of a matrix at the given index without doing a bounds check.
Examples
use rulinalg::matrix::{Matrix, BaseMatrix}; let mat = matrix![0, 1, 2; 3, 4, 5; 6, 7, 8]; let col = unsafe { mat.col_unchecked(2) }; let expected = matrix![2usize; 5; 8]; assert_matrix_eq!(*col, expected);
fn row(&self, index: usize) -> Row<T>
Returns the row of a matrix at the given index.
Examples
use rulinalg::matrix::{Matrix, BaseMatrix}; let mat = matrix![0, 1, 2; 3, 4, 5; 6, 7, 8]; let row = mat.row(1); let expected = matrix![3usize, 4, 5]; assert_matrix_eq!(*row, expected);
Panics
Will panic if the row index is out of bounds.
unsafe fn row_unchecked(&self, index: usize) -> Row<T>
Returns the row of a matrix at the given index without doing unbounds checking
Examples
use rulinalg::matrix::{Matrix, BaseMatrix}; let mat = matrix![0, 1, 2; 3, 4, 5; 6, 7, 8]; let row = unsafe { mat.row_unchecked(2) }; let expected = matrix![6usize, 7, 8]; assert_matrix_eq!(*row, expected);
fn iter<'a>(&self) -> SliceIter<'a, T> where T: 'a
Returns an iterator over the matrix data.
Examples
use rulinalg::matrix::{Matrix, BaseMatrix}; let mat = matrix![0, 1, 2; 3, 4, 5; 6, 7, 8]; let slice = mat.sub_slice([1, 1], 2, 2); let slice_data = slice.iter().map(|v| *v).collect::<Vec<usize>>(); assert_eq!(slice_data, vec![4, 5, 7, 8]);
fn col_iter(&self) -> Cols<T>
Iterate over the columns of the matrix.
Examples
use rulinalg::matrix::{Matrix, BaseMatrix}; let a = matrix![0, 1; 2, 3; 4, 5]; let mut iter = a.col_iter(); assert_matrix_eq!(*iter.next().unwrap(), matrix![ 0; 2; 4 ]); assert_matrix_eq!(*iter.next().unwrap(), matrix![ 1; 3; 5 ]); assert!(iter.next().is_none());
fn row_iter(&self) -> Rows<T>
Iterate over the rows of the matrix.
Examples
use rulinalg::matrix::{Matrix, BaseMatrix}; let a = matrix![0, 1, 2; 3, 4, 5; 6, 7, 8]; let mut iter = a.row_iter(); assert_matrix_eq!(*iter.next().unwrap(), matrix![ 0, 1, 2 ]); assert_matrix_eq!(*iter.next().unwrap(), matrix![ 3, 4, 5 ]); assert_matrix_eq!(*iter.next().unwrap(), matrix![ 6, 7, 8 ]); assert!(iter.next().is_none());
fn diag_iter(&self, k: DiagOffset) -> Diagonal<T, Self>
Iterate over diagonal entries
Examples
use rulinalg::matrix::{DiagOffset, Matrix, BaseMatrix}; let a = matrix![0, 1, 2; 3, 4, 5; 6, 7, 8]; // Print super diag [1, 5] for d in a.diag_iter(DiagOffset::Above(1)) { println!("{}", d); } // Print sub diag [3, 7] // Equivalent to `diag_iter(DiagOffset::Below(1))` for d in a.diag_iter(DiagOffset::from(-1)) { println!("{}", d); }
Panics
If using an Above
or Below
offset which is
out-of-bounds this function will panic.
This function will never panic if the Main
diagonal
offset is used.
fn sum_rows(&self) -> Vector<T> where T: Copy + Zero + Add<T, Output=T>
The sum of the rows of the matrix.
Returns a Vector equal to the sums of elements over the matrices rows.
Note that the resulting vector is identical to the sums of elements along each column of the matrix.
Examples
use rulinalg::matrix::{Matrix, BaseMatrix}; let a = matrix![1.0, 2.0; 3.0, 4.0]; let c = a.sum_rows(); assert_eq!(c, vector![4.0, 6.0]);
fn sum_cols(&self) -> Vector<T> where T: Copy + Zero + Add<T, Output=T>
The sum of the columns of the matrix.
Returns a Vector equal to the sums of elements over the matrices columns.
Note that the resulting vector is identical to the sums of elements along each row of the matrix.
Examples
use rulinalg::matrix::{Matrix, BaseMatrix}; let a = matrix![1.0, 2.0; 3.0, 4.0]; let c = a.sum_cols(); assert_eq!(c, vector![3.0, 7.0]);
fn norm<N: MatrixNorm<T, Self>>(&self, norm: N) -> T where T: Float
Compute given matrix norm for matrix.
Examples
use rulinalg::matrix::BaseMatrix; use rulinalg::norm::Euclidean; let a = matrix![3.0, 4.0]; let c = a.norm(Euclidean); assert_eq!(c, 5.0);
fn metric<'a, 'b, B, M>(&'a self, mat: &'b B, metric: M) -> T where B: 'b + BaseMatrix<T>, M: MatrixMetric<'a, 'b, T, Self, B>
Compute the metric distance between two matrices.
Examples
use rulinalg::matrix::BaseMatrix; use rulinalg::norm::Euclidean; let a = matrix![3.0, 4.0; 1.0, 2.0]; let b = matrix![2.0, 5.0; 0.0, 3.0]; // Compute the square root of the sum of // elementwise squared-differences let c = a.metric(&b, Euclidean); assert_eq!(c, 2.0);
fn sum(&self) -> T where T: Copy + Zero + Add<T, Output=T>
The sum of all elements in the matrix
Examples
use rulinalg::matrix::BaseMatrix; let a = matrix![1.0, 2.0; 3.0, 4.0]; let c = a.sum(); assert_eq!(c, 10.0);
fn min(&self, axis: Axes) -> Vector<T> where T: Copy + PartialOrd
The min of the specified axis of the matrix.
Examples
use rulinalg::matrix::{Matrix, BaseMatrix, Axes}; let a = matrix![1.0, 2.0; 3.0, 4.0]; let cmin = a.min(Axes::Col); assert_eq!(cmin, vector![1.0, 3.0]); let rmin = a.min(Axes::Row); assert_eq!(rmin, vector![1.0, 2.0]);
fn max(&self, axis: Axes) -> Vector<T> where T: Copy + PartialOrd
The max of the specified axis of the matrix.
Examples
use rulinalg::matrix::{BaseMatrix, Axes}; let a = matrix![1.0, 2.0; 3.0, 4.0]; let cmax = a.max(Axes::Col); assert_eq!(cmax, vector![2.0, 4.0]); let rmax = a.max(Axes::Row); assert_eq!(rmax, vector![3.0, 4.0]);
fn into_matrix(self) -> Matrix<T> where T: Copy
Convert the matrix struct into a owned Matrix.
fn select_rows<'a, I>(&self, rows: I) -> Matrix<T> where T: Copy,
I: IntoIterator<Item=&'a usize>,
I::IntoIter: ExactSizeIterator + Clone
I: IntoIterator<Item=&'a usize>,
I::IntoIter: ExactSizeIterator + Clone
Select rows from matrix
Examples
use rulinalg::matrix::{Matrix, BaseMatrix}; let a = Matrix::<f64>::ones(3,3); let b = &a.select_rows(&[2]); assert_eq!(b.rows(), 1); assert_eq!(b.cols(), 3); let c = &a.select_rows(&[1,2]); assert_eq!(c.rows(), 2); assert_eq!(c.cols(), 3);
Panics
- Panics if row indices exceed the matrix dimensions.
fn select_cols<'a, I>(&self, cols: I) -> Matrix<T> where T: Copy,
I: IntoIterator<Item=&'a usize>,
I::IntoIter: ExactSizeIterator + Clone
I: IntoIterator<Item=&'a usize>,
I::IntoIter: ExactSizeIterator + Clone
Select columns from matrix
Examples
use rulinalg::matrix::{Matrix, BaseMatrix}; let a = Matrix::<f64>::ones(3,3); let b = &a.select_cols(&[2]); assert_eq!(b.rows(), 3); assert_eq!(b.cols(), 1); let c = &a.select_cols(&[1,2]); assert_eq!(c.rows(), 3); assert_eq!(c.cols(), 2);
Panics
- Panics if column indices exceed the matrix dimensions.
fn elemul(&self, m: &Self) -> Matrix<T> where T: Copy + Mul<T, Output=T>
The elementwise product of two matrices.
Examples
use rulinalg::matrix::{Matrix, BaseMatrix}; let a = matrix![1.0, 2.0; 3.0, 4.0]; let b = matrix![1.0, 2.0; 3.0, 4.0]; let c = &a.elemul(&b); assert_matrix_eq!(c, &matrix![1.0, 4.0; 9.0, 16.0]); }
Panics
- The matrices have different row counts.
- The matrices have different column counts.
fn elediv(&self, m: &Self) -> Matrix<T> where T: Copy + Div<T, Output=T>
The elementwise division of two matrices.
Examples
use rulinalg::matrix::{Matrix, BaseMatrix}; let a = matrix![1.0, 2.0; 3.0, 4.0]; let b = matrix![1.0, 2.0; 3.0, 4.0]; let c = &a.elediv(&b); assert_matrix_eq!(c, &matrix![1.0, 1.0; 1.0, 1.0]);
Panics
- The matrices have different row counts.
- The matrices have different column counts.
fn select(&self, rows: &[usize], cols: &[usize]) -> Matrix<T> where T: Copy
Select block matrix from matrix
Examples
use rulinalg::matrix::{Matrix, BaseMatrix}; let a = Matrix::<f64>::identity(3); let b = &a.select(&[0,1], &[1,2]); // We get the 2x2 block matrix in the upper right corner. assert_eq!(b.rows(), 2); assert_eq!(b.cols(), 2); // Prints [0,0, 1,0] println!("{:?}", b.data());
Panics
- Panics if row or column indices exceed the matrix dimensions.
fn hcat<S>(&self, m: &S) -> Matrix<T> where T: Copy, S: BaseMatrix<T>
Horizontally concatenates two matrices. With self on the left.
Examples
use rulinalg::matrix::{Matrix, BaseMatrix}; let a = matrix![1.0, 2.0; 3.0, 4.0; 5.0, 6.0]; let b = matrix![4.0; 5.0; 6.0]; let c = &a.hcat(&b); assert_eq!(c.cols(), a.cols() + b.cols()); assert_eq!(c[[1, 2]], 5.0);
Panics
- Self and m have different row counts.
fn vcat<S>(&self, m: &S) -> Matrix<T> where T: Copy, S: BaseMatrix<T>
Vertically concatenates two matrices. With self on top.
Examples
use rulinalg::matrix::{Matrix, BaseMatrix}; let a = matrix![1.0, 2.0, 3.0; 4.0, 5.0, 6.0]; let b = matrix![4.0, 5.0, 6.0];; let c = &a.vcat(&b); assert_eq!(c.rows(), a.rows() + b.rows()); assert_eq!(c[[2, 2]], 6.0);
Panics
- Self and m have different column counts.
fn diag(&self) -> Diagonal<T, Self>
Extract the diagonal of the matrix
Examples
use rulinalg::matrix::BaseMatrix; let a = matrix![1, 2, 3; 4, 5, 6; 7, 8, 9].diag().cloned().collect::<Vec<_>>(); let b = matrix![1, 2; 3, 4; 5, 6].diag().cloned().collect::<Vec<_>>(); assert_eq!(a, vec![1, 5, 9]); assert_eq!(b, vec![1, 4]);
fn transpose(&self) -> Matrix<T> where T: Copy
Tranposes the given matrix
Examples
use rulinalg::matrix::{Matrix, BaseMatrix}; let mat = matrix![1.0, 2.0, 3.0; 4.0, 5.0, 6.0]; let expected = matrix![1.0, 4.0; 2.0, 5.0; 3.0, 6.0]; assert_matrix_eq!(mat.transpose(), expected);
fn is_diag(&self) -> bool where T: Zero + PartialEq
Checks if matrix is diagonal.
Examples
use rulinalg::matrix::{Matrix, BaseMatrix}; let a = matrix![1.0, 0.0; 0.0, 1.0]; let a_diag = a.is_diag(); assert_eq!(a_diag, true); let b = matrix![1.0, 0.0; 1.0, 0.0]; let b_diag = b.is_diag(); assert_eq!(b_diag, false);
fn solve_u_triangular(&self, y: Vector<T>) -> Result<Vector<T>, Error> where T: Any + Float
Solves an upper triangular linear system.
Given a matrix A
and a vector b
, this function returns the
solution of the upper triangular system Ux = b
, where U
is
the upper triangular part of A
.
Examples
use rulinalg::matrix::BaseMatrix; use std::f32; let u = matrix![1.0, 2.0; 0.0, 1.0]; let y = vector![3.0, 1.0]; let x = u.solve_u_triangular(y).expect("A solution should exist!"); assert!((x[0] - 1.0) < f32::EPSILON); assert!((x[1] - 1.0) < f32::EPSILON);
Panics
- Vector size and matrix column count are not equal.
Failures
- There is no valid solution to the system (matrix is singular).
- The matrix is empty.
fn solve_l_triangular(&self, y: Vector<T>) -> Result<Vector<T>, Error> where T: Any + Float
Solves a lower triangular linear system.
Given a matrix A
and a vector b
, this function returns the
solution of the lower triangular system Lx = b
, where L
is
the lower triangular part of A
.
Examples
use rulinalg::matrix::BaseMatrix; use std::f32; let l = matrix![1.0, 0.0; 2.0, 1.0]; let y = vector![1.0, 3.0]; let x = l.solve_l_triangular(y).expect("A solution should exist!"); println!("{:?}", x); assert!((x[0] - 1.0) < f32::EPSILON); assert!((x[1] - 1.0) < f32::EPSILON);
Panics
- Vector size and matrix column count are not equal.
Failures
- There is no valid solution to the system (matrix is singular).
- The matrix is empty.
fn split_at(&self, mid: usize, axis: Axes) -> (MatrixSlice<T>, MatrixSlice<T>)
Split the matrix at the specified axis returning two MatrixSlice
s.
Examples
use rulinalg::matrix::{Axes, Matrix, BaseMatrix}; let a = Matrix::new(3,3, vec![2.0; 9]); let (b,c) = a.split_at(1, Axes::Row);
fn sub_slice<'a>(&self,
start: [usize; 2],
rows: usize,
cols: usize)
-> MatrixSlice<'a, T> where T: 'a
start: [usize; 2],
rows: usize,
cols: usize)
-> MatrixSlice<'a, T> where T: 'a
Produce a MatrixSlice
from an existing matrix.
Examples
use rulinalg::matrix::{Matrix, BaseMatrix, MatrixSlice}; let a = Matrix::new(3,3, (0..9).collect::<Vec<usize>>()); let slice = MatrixSlice::from_matrix(&a, [1,1], 2, 2); let new_slice = slice.sub_slice([0,0], 1, 1);
Implementors
impl<T> BaseMatrix<T> for Matrix<T>
impl<'a, T> BaseMatrix<T> for MatrixSlice<'a, T>
impl<'a, T> BaseMatrix<T> for MatrixSliceMut<'a, T>
impl<'a, T> BaseMatrix<T> for Row<'a, T>
impl<'a, T> BaseMatrix<T> for RowMut<'a, T>
impl<'a, T> BaseMatrix<T> for Column<'a, T>
impl<'a, T> BaseMatrix<T> for ColumnMut<'a, T>