This repository is dedicated to the s21_matrix library, which implements matrices and mathematical operations on them in the C++ programming language.
Prerequirements:
Ubuntu/MacOS like system
Install dependices:
- Ubuntu-like systems:
sudo apt install -y g++ build-essential libgtest-dev cmake lcov clang-format cppcheck valgrind && cd /usr/src/googletest && sudo cmake . && sudo make && sudo cp lib/*.a /usr/lib && cd -- MacOS-like systems:
brew install gcc cmake lcov clang-format cppcheck valgrind googletest && cd /usr/local/Cellar/googletest/*/lib && sudo cp *.a /usr/local/lib && cd -Run:
makeMatrix is a rectangular table of numbers arranged in m rows and n columns
1 2 3
A = 4 5 6
7 8 9
1 2 3 4
В = 5 6 7 8
9 10 11 12
You can get the desired element using indices as follows A[1,1] = 1, where the first index is the row number, the second is the column number.
The order of a matrix is the number of its rows or columns.
The main diagonal of a square matrix is the diagonal from the upper left to the lower right corner. \
A rectangular matrix (B) is a matrix with the number of rows not equal to the number of columns.
A square matrix (A) is a matrix with the number of rows equal to the number of columns.
| Operation | Description | Exceptional situations |
|---|---|---|
bool EqMatrix(const S21Matrix& other) |
Checks matrices for equality with each other | |
void SumMatrix(const S21Matrix& other) |
Adds the second matrix to the current one | different matrix dimensions |
void SubMatrix(const S21Matrix& other) |
Subtracts another matrix from the current one | different matrix dimensions |
void MulNumber(const double num) |
Multiplies the current matrix by a number | |
void MulMatrix(const S21Matrix& other) |
Multiplies the current matrix by the second matrix | the number of columns of the first matrix is not equal to the number of rows of the second matrix |
S21Matrix Transpose() |
Creates a new transposed matrix from the current one and returns it | |
S21Matrix CalcComplements() |
Calculates the algebraic addition matrix of the current one and returns it | the matrix is not square |
double Determinant() |
Calculates and returns the determinant of the current matrix | the matrix is not square |
S21Matrix InverseMatrix() |
Calculates and returns the inverse matrix | matrix determinant is 0 |
| Method | Description |
|---|---|
S21Matrix() |
A basic constructor that initialises a matrix of some predefined dimension |
S21Matrix(int rows, int cols) |
Parametrized constructor with number of rows and columns |
S21Matrix(const S21Matrix& other) |
Copy constructor |
S21Matrix(S21Matrix&& other) |
Move constructor |
~S21Matrix() |
Destructor |
| Operator | Description | Exceptional situations |
|---|---|---|
+ |
Addition of two matrices | different matrix dimensions |
- |
Subtraction of one matrix from another | different matrix dimensions |
* |
Matrix multiplication and matrix multiplication by a number | the number of columns of the first matrix does not equal the number of rows of the second matrix |
== |
Checks for matrices equality (EqMatrix) |
|
= |
Assignment of values from one matrix to another one | |
+= |
Addition assignment (SumMatrix) |
different matrix dimensions |
-= |
Difference assignment (SubMatrix) |
different matrix dimensions |
*= |
Multiplication assignment (MulMatrix/MulNumber) |
the number of columns of the first matrix does not equal the number of rows of the second matrix |
(int i, int j) |
Indexation by matrix elements (row, column) | index is outside the matrix |