Matrix Library

This is a C++ matrix library. It operates on two-dimensional matrices, has a lot of convenient methods for using matrices in your application

Usage

Include header my_matrix_oop.h

API

MyMatrix - the main class of the program
It represents mxn matrix (m rows, n columns)

Public constructors:

Constructor	Description	Trows
MyMatrix()	Default constructor. Allocates a 1x1 matrix (initial value is 0.0)	std::bad_alloc on allocation error
MyMatrix(int rows, int cols)	Allocates a rowsxcols matrix (rows rows, cols cols)	std::bad_alloc on allocation error; std::invalid_argument if rows or cols are less than 1
MyMatrix(const MyMatrix &other)	Copy constructor. Copies contents of other matrix	std::bad_alloc on allocation error; std::invalid_argument if other is empty
MyMatrix(MyMatrix &&other)	Move constructor. Moves contents of other to the new matrix. The other matrix becomes empty	std::invalid_argument if other is empty

Public methods:

Method	Description	Trows
GetRows() -> int	Returns current row count of the matrix	-
GetCols() -> int	Returns current column count of the matrix	-
SetRows(int rows)	Sets current row count to rows; fills new rows with 0.0	std::bad_alloc on allocation error; std::invalid_argument if rows is less than 1
SetCols(int cols)	Sets current column count to cols; fills new columns with 0.0	std::bad_alloc on allocation error; std::invalid_argument if cols is less than 1
EqMatrix(const MyMatrix &other) -> bool	Returns true if other is the same size as this matrix, if other's elements are approximately the same as in this matrix (presicion 1e-6). Returns false otherwise	-
SumMatrix(const MyMatrix &other)	Sums this matrix with other. The result is saved in this matrix	std::invalid_argument if matrices' dimenstions differ
SubMatrix(const MyMatrix &other)	Subtracts other matrix from this. The result is saved in this matrix	std::invalid_argument if matrices' dimenstions differ
MulNumber(const double num)	Multiplies this matrix by num. The result is saved in this matrix	-
MulMatrix(const MyMatrix &other)	Multiplies this matrix by other. The result is saved in this matrix	std::invalid_argument if this' column count is different than other's
Transpose() -> MyMatrix	Returns transposed version of this matrix	std::bad_alloc on allocation error
CalcComplements() -> Mymatrix	Returns this' algebraic complement matrix	std::bad_alloc on allocation error
Determinant -> double	Returns this' determinant	std::logic_error if this is not a square matrix; std::bad_alloc on allocation error
Minor(int i, int j) -> double	Returns minor of element at position (i, j)	std::logic_error if this is not a square matrix; std::bad_alloc on allocation error
InverseMatrix() -> MyMatrix	Returns inverse of this matrix	std::logic_error if this is not a square matrix; std::logic_error if determinant of the matrix is zero; std::bad_alloc on allocation error

Operator overloads:

All operations will be performed on MyMatrix A, B;

Usage	Description	Trows
A(int i, int j)	Returns element at (i, j)	std::invalid_argument if indices are out of bounds
A = B	Same as MyMatrix A(B);
A = std::move(B)	Same as MyMatrix A(std::move(B));
+A	Same as A (plus operator overload)
-A	Same as A.MulNumber(-1.0);
A + B	Analogous to SumMatrix method
A - B	Analogous to SubMatrix method
A * B	Analogous to MulMatrix method
A * num or num * A	Analogous to MulNumber method
A == B	Analogous to EqMatrix method
A += B	Same as A = A + B
A -= B	Same as A = A - B
A *= B	Same as A = A * B
A *= num	Same as A = A * num

Building

Requirements

• gcc
• stdc++ (usually comes bundled with g++)
• Google Test (for tests)

Build steps

cd src
make my_matrix_oop.a

Testing

Testing is done on Google Test testing framework. To run tests, run the following:

cd src
make test