refactor: get_row, column adn diagunal uses iterators

src/lib.rs

@@ -1,4 +1,3 @@
-use core::panic;
 use fractions::Fraction;
 use std::fmt::{Debug, Display};
 use std::ops::Add;
@@ -48,50 +47,34 @@ impl Matrix {
         return Ok(&self.data[index]);
     }
 
-    pub fn get_row(&self, row: usize) -> Result<Vec<Fraction>, MatrixError> {
+    pub fn get_row(&self, row: usize) -> Result<impl Iterator<Item = &Fraction>, MatrixError> {
         if row >= self.rows {
             return Err(MatrixError::RowOutOfRange);
         }
 
-        let mut index = 0;
-        let mut data = Vec::new();
+        let start = row * self.columns;
+        let end = start + self.columns;
 
-        index += self.columns * row;
-        for i in 0..self.columns {
-            data.push(self.data[index + i]);
-        }
-
-        return Ok(data);
+        return Ok(self.data[start..end].iter());
     }
 
-    pub fn get_column(&self, column: usize) -> Result<Vec<Fraction>, MatrixError> {
+    pub fn get_column(
+        &self,
+        column: usize,
+    ) -> Result<impl Iterator<Item = &Fraction>, MatrixError> {
         if column >= self.columns {
             return Err(MatrixError::ColumnOutOfRange);
         }
 
-        let index = column;
-        let mut data = Vec::new();
-
-        for i in 0..self.rows {
-            data.push(self.data[(i * self.columns) + index])
-        }
-
-        return Ok(data);
+        Ok((0..self.rows).map(move |i| &self.data[i * self.columns + column]))
     }
 
-    pub fn get_diagonal(&self) -> Result<Vec<Fraction>, MatrixError> {
+    pub fn get_diagonal(&self) -> Result<impl Iterator<Item = &Fraction>, MatrixError> {
         if self.columns != self.rows {
             return Err(MatrixError::NotSquared);
         }
 
-        let mut data = Vec::new();
-
-        let mut index;
-        for i in 0..self.columns {
-            index = i + (i * self.columns);
-            data.push(self.data[index]);
-        }
-        return Ok(data);
+        Ok((0..self.rows).map(move |i| &self.data[i * self.columns + i]))
     }
 
     pub fn set(&mut self, row: usize, column: usize, data: Fraction) -> Option<MatrixError> {
@@ -140,16 +123,11 @@ impl Matrix {
             return Some(MatrixError::RowOutOfRange);
         }
 
-        //Get copy of row2
-        let temp = self.get_row(row2).unwrap();
-        let mut index1 = 0;
-        let mut index2 = 0;
-        //Move from row1 to row2
-        index1 += self.columns * row1;
-        index2 += self.columns * row2;
+        let start1 = row1 * self.columns;
+        let start2 = row2 * self.columns;
+
         for i in 0..self.columns {
-            self.data[index2 + i] = self.data[index1 + i];
-            self.data[index1 + i] = temp[i];
+            self.data.swap(start1 + i, start2 + i);
         }
 
         None
@@ -160,11 +138,11 @@ impl Matrix {
             return Some(MatrixError::ColumnOutOfRange);
         }
 
-        //Get copy of column2
-        let temp = self.get_column(column2).unwrap();
         for i in 0..self.rows {
-            self.data[column2 + (i * self.columns)] = self.data[column1 + (i * self.columns)];
-            self.data[column1 + (i * self.columns)] = temp[i];
+            let idx1 = column1 + i * self.columns;
+            let idx2 = column2 + i * self.columns;
+
+            self.data.swap(idx1, idx2);
         }
 
         None
@@ -218,8 +196,7 @@ impl Matrix {
                 let row_i = trig_matrix.get_row(i)?;
 
                 let new_row = row_x
-                    .iter()
-                    .zip(row_i.iter())
+                    .zip(row_i)
                     .map(|(a, b)| *a - m * *b)
                     .collect::<Vec<Fraction>>();
 
@@ -233,7 +210,6 @@ impl Matrix {
         let determinant = sign
             * trig_matrix
                 .get_diagonal()?
-                .iter()
                 .copied()
                 .fold(Fraction::from(1i64), |acc, x| acc * x);
 
@@ -288,19 +264,21 @@ impl Mul for Matrix {
 
     fn mul(self, other: Self) -> Self::Output {
         if self.columns != other.rows {
-            panic!("Matrix dimentions are inadecuate.");
+            return Err(MatrixError::InvalidSizeForMul);
         }
 
         let mut new_data: Vec<Fraction> = Vec::new();
         for i in 0..self.rows {
-            let current_row = self.get_row(i)?;
-
             for k in 0..other.columns {
                 let current_column = other.get_column(k)?;
+                let current_row = self.get_row(i)?;
+
                 let mut new_value = Fraction::new(0, 1).unwrap();
-                for (a, b) in current_row.iter().zip(current_column.iter()) {
+
+                for (a, b) in current_row.zip(current_column) {
                     new_value = new_value + (*a * *b);
                 }
+
                 new_data.push(new_value);
             }
         }