Add the subject and test of the exercise `matrix`

rust/tests/matrix_test/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "lalgebra_scalar"
+version = "0.1.0"
+
+[[package]]
+name = "matrix"
+version = "0.1.0"
+dependencies = [
+ "lalgebra_scalar",
+]
+
+[[package]]
+name = "matrix_test"
+version = "0.1.0"
+dependencies = [
+ "matrix",
+]

rust/tests/matrix_test/Cargo.toml

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+[package]
+name = "matrix_test"
+version = "0.1.0"
+authors = ["Augusto <aug.ornelas@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+matrix = { path = "../../../../rust-piscine-solutions/matrix"}

rust/tests/matrix_test/src/main.rs

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+// First exercise
+
+// # Instructions
+// Define a data structure to represent a matrix of any size and
+// implement the basic operations for this you will need to follow the
+// next steps:
+
+// You can use a 2 dimensional Vec<T>'s
+// We will consider a matrix as a rectangular arrangements of scalars
+// You can use the definition of scalars done in the last exercise:
+// `lalgebra_scalar`
+
+// Then define the associated function `identity` that returns the identity matrix
+// of size n
+// Ex:
+// Matrix::identity(3) == [[1,0,0], [0,1,0], [0,0,1]]
+
+// And the associated function `zero` that returns a matrix of size
+// `row x col` with all the positions filled by zeroes
+// Ex:
+// Matrix::zero(3, 3) == [[0,0,0],[0,0,0],[0,0,0]]
+
+// Resources: https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
+
+use matrix::Matrix;
+
+#[allow(dead_code)]
+fn main() {
+	let m: Matrix<u32> = Matrix(vec![vec![0, 0, 0, 0], vec![0, 0, 0, 0], vec![0, 0, 0, 0]]);
+	println!("{:?}", m);
+	println!("{:?}", Matrix::<i32>::identity(4));
+	println!("{:?}", Matrix::<i32>::zero(3, 4));
+}
+
+#[test]
+fn zero_property() {
+	let matrix: Matrix<u32> = Matrix::zero(3, 4);
+	let expected: Matrix<u32> = Matrix(vec![vec![0, 0, 0, 0], vec![0, 0, 0, 0], vec![0, 0, 0, 0]]);
+	assert_eq!(matrix, expected);
+
+	let matrix: Matrix<u32> = Matrix::zero(2, 2);
+	let expected: Matrix<u32> = Matrix(vec![vec![0, 0], vec![0, 0]]);
+	assert_eq!(matrix, expected);
+}
+
+#[test]
+fn identy_matrix() {
+	let matrix: Matrix<u32> = Matrix::identity(2);
+	let expected: Matrix<u32> = Matrix(vec![vec![1, 0], vec![0, 1]]);
+	assert_eq!(matrix, expected);
+
+	let matrix: Matrix<u32> = Matrix::identity(3);
+	let expected: Matrix<u32> = Matrix(vec![vec![1, 0, 0], vec![0, 1, 0], vec![0, 0, 1]]);
+	assert_eq!(matrix, expected);
+}

subjects/matrix/README.md

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+## matrix
+
+### Instructions
+
+Define a data structure to represent a matrix of any size and implement the basic operations for this you will need to follow the next steps:
+
+You can use a 2 dimensional Vec<T>'s We will consider a matrix as a rectangular arrangements of scalars.
+
+You have to use the definition of scalars done in the last exercise: `lalgebra_scalar`
+
+Then define the associated function `identity` that returns the identity matrix of size n
+
+And the associated function `zero` that returns a matrix of size `row x col` with all the positions filled by zeroes
+
+### Notions
+
+[Traits]( https://doc.rust-lang.org/book/ch19-03-advanced-traits.html )
+
+### Expected Functions and Structure
+
+```rust
+pub struct Matrix<T>(pub Vec<Vec<T>>);
+
+impl Matrix<T> {
+	pub fn new() -> Matrix<T> {
+	}
+
+	pub fn zero(row: usize, col: usize) -> Matrix<T> {
+	}
+
+	pub fn identity(n: usize) -> Matrix<T> {
+	}
+}
+```
+
+### Usage
+
+Here is a program to test your function.
+
+```rust
+fn main() {
+	let m: Matrix<u32> = Matrix(vec![vec![0, 0, 0, 0], vec![0, 0, 0, 0], vec![0, 0, 0, 0]]);
+	println!("{:?}", m);
+	println!("{:?}", Matrix::<i32>::identity(4));
+	println!("{:?}", Matrix::<f64>::zero(3, 4));
+}
+```
+
+And its output
+
+```console
+student@ubuntu:~/[[ROOT]]/test$ cargo run
+Matrix([[0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0]])
+Matrix([[1, 0, 0, 0], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]])
+Matrix([[0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0]])
+student@ubuntu:~/[[ROOT]]/test$
+```