feat(matrix_op): add multiplication

matrix_ops: add matrix multiply capability
chore(fmt): flatten crate directory
tests(ops): add tests for multiplication

src/lib.rs

@@ -9,20 +9,23 @@
 //!
 //! Examples:
 //! ```
-//! ...
 //! use matrix::Matrix;
-//! let m = Matrix::from_str("1,2,3\n4,5,6\n7,8,9");
+//! use std::str::FromStr;
+//! let m = Matrix::from_str("1,2,3\n4,5,6\n7,8,9").expect("Expected this to work");
 //! println!("Matrix string formatting:\n{}", m);
 //! println!("Evaluate determinant of matrix: {}", m.determinant());
 //! println!("Transpose of matrix m:\n{}", m.transpose());
-//! ...
+//! 
 //! ```
 
-pub mod types;
+mod matrix;
+pub mod error;
 
 #[cfg(test)]
 mod tests;
 
+pub use matrix::Matrix;
+
 pub fn test() {
     println!("Testing code here");
 }

src/matrix.rs

@@ -3,16 +3,17 @@
 //! Example usage - addition of two matrices:
 //! ```
 //! use matrix::Matrix;
-//! let m1 = Matrix::from_str("1,1,1\n1,1,1\n1,1,1");
-//! let m2 = Matrix::from_str("2,2,2\n2,2,2\n2,2,2");
-//! println!("Sum of m1 + m2: \n{}", m1 + m2);
+//! use std::str::FromStr;
+//! let m1 = Matrix::from_str("1,2\n3,4").expect("Expect parse correct");
+//! let m2 = Matrix::from_str("1,1\n1,1").expect("Expect parse correct");
+//! let m_add = &m1 + &m2;
+//! println!("m1 + m2 =\n{}", m_add);
 //! ```
-//!
 //! TODO:: Create matrix multiplication method
 
 use std::{fmt::Display, ops::{Add, Mul, Sub}, str::FromStr};
 
-use super::matrix_err::{MatrixSetValueError, ParseMatrixError};
+use crate::error::{MatrixSetValueError, ParseMatrixError};
 #[derive(Debug, PartialEq, Eq)]
 pub struct Matrix {
     /// Number of rows in matrix.
@@ -95,7 +96,27 @@ impl<'a, 'b> Sub<&'b Matrix> for &'a Matrix {
 impl<'a, 'b> Mul<&'b Matrix> for &'a Matrix {
     type Output = Matrix;
     fn mul(self, rhs: &'b Matrix) -> Self::Output {
-        todo!()
+        fn reduce(lhs: &Matrix, rhs: &Matrix, at_r: usize, at_c: usize) -> i32 {
+            let mut tmp = 0;
+            for i in 0..lhs.ncols {
+                tmp += lhs.get(at_r, i).unwrap() * rhs.get(i, at_c).unwrap();
+            }
+            tmp
+        }
+        let mut d: Vec<Vec<i32>> = Vec::new();
+        if self.ncols != rhs.nrows {
+            println!("LHS: \n{}RHS: \n{}", self, rhs);
+            println!("LHS nrows: {} ;; RHS ncols: {}", self.nrows, rhs.ncols);
+            panic!()
+        }
+        for i in 0..self.nrows {
+            let mut r: Vec<i32> = Vec::new();
+            for j in 0..rhs.ncols {
+                r.push(reduce(self, rhs, i, j));
+            }
+            d.push(r);
+        }
+        Matrix::new(d)
     }
 }
 

src/tests.rs

@@ -1,2 +1,3 @@
 #[cfg(test)]
-pub mod matrix_test;
+mod matrix_test_parse;
+mod matrix_test_ops;

src/tests/matrix_test_ops.rs

@@ -1,19 +1,7 @@
 use std::str::FromStr;
 
-use crate::types::{matrix::Matrix, matrix_err::ParseMatrixError};
+use crate::{matrix::Matrix, error::ParseMatrixError};
 
-#[test]
-pub fn test_matrix_init_from_string() -> Result<(), ParseMatrixError> {
-    let data_target = vec![vec![1, 2, 3], vec![4, 5, 6], vec![7, 8, 9]];
-    let target = Matrix {
-        nrows: 3,
-        ncols: 3,
-        data: data_target,
-    };
-    let test = Matrix::from_str("1,2,3\n4,5,6\n7,8,9")?;
-    assert_eq!(target, test);
-    Ok(())
-}
 #[test]
 pub fn test_matrix_add() -> Result<(), ParseMatrixError> {
     let m1 = Matrix::from_str("1,2,3\n4,5,6\n7,8,9")?;
@@ -37,13 +25,16 @@ pub fn test_matrix_transposition() -> Result<(), ParseMatrixError> {
     Ok(())
 }
 #[test]
-pub fn test_matrix_parse_malformed() -> () {
-    let malformed = "1,23,\n,567,\n\n5";
-    let m = Matrix::from_str(malformed);
-    match m {
-        Ok(_) => panic!("This malformed matrix string should not have succeeded"),
-        Err(_) => (),
-    }
+pub fn test_matrix_mul() -> Result<(), ParseMatrixError> {
+    let m1 = Matrix::from_str("1,2\n1,2")?;
+    let m2 = Matrix::from_str("1,3\n2,4")?;
+    let m3 = Matrix::from_str("1,2\n3,4")?;
+    let m4 = Matrix::from_str("1\n2")?;
+    let t1 = Matrix::from_str("5,11\n5,11")?;
+    let t2 = Matrix::from_str("5\n11")?;
+    assert_eq!(&m1 * &m2, t1);
+    assert_eq!(&m3 * &m4, t2);
+    Ok(())
 }
 #[test]
 #[should_panic]

src/tests/matrix_test_parse.rs

@@ -0,0 +1,22 @@
+use std::str::FromStr;
+
+use crate::{matrix::Matrix, error::ParseMatrixError};
+
+#[test]
+pub fn test_matrix_init_from_string() -> Result<(), ParseMatrixError> {
+    let data_target = vec![vec![1, 2, 3], vec![4, 5, 6], vec![7, 8, 9]];
+    let target = Matrix::new(data_target);
+    let test = Matrix::from_str("1,2,3\n4,5,6\n7,8,9")?;
+    assert_eq!(target, test);
+    Ok(())
+}
+#[test]
+pub fn test_matrix_parse_malformed() -> () {
+    let malformed = "1,23,\n,567,\n\n5";
+    let m = Matrix::from_str(malformed);
+    match m {
+        Ok(_) => panic!("This malformed matrix string should not have succeeded"),
+        Err(_) => (),
+    }
+}
+

src/types.rs

@@ -1,8 +0,0 @@
-//! Matrix-related type definitions
-//!
-//! Includes modules:
-//! - Matrix 
-//! - Matrix parse and arithmetic errors
-
-pub mod matrix;
-pub mod matrix_err;