ignabelitzky / matrices-calculator

Calculations with matrices in C++

MatricesCalculator

Table of contents

• Description
• Custom Dynamic-Arrays
• Examples (2D-matrices)
  • Add two integer-matrices
  • Multiply two integer-matrices
• ToDo

Description

A C++ project that focuses on the calculation with matrices. Functions:

• Add two 2D matrices
• Subtract two 2D matrices
• Multiply two 2D matrices
• Multiply 2D-matrix with a scalar
• Calculate the transpose of a 2D matrix
• Export a given 2D matrix into a static-int array

The C++ file in which the actual arithmetic operations are performed is called two_dimensional_matrix_operations.cpp for the 2-dimensional matrices.

Custom Dynamic-Arrays

At first I tried to store the matrices in my own programmed dynamic lists (concatenated lists), but then decided to use the std::vector Container-Class from the Standard Template Library (STL) of C++ for efficiency and security reasons. If you're still interested in using this project with custom Dynamic Array Management, you can explore the custom_dynamic_arrays directory.

Examples (2D-matrices)

Add two integer-matrices

TwoDimensionalMatrix<int> matrixA; // Create Object

int Arow1[] = {23,201,2333};
int Arow2[] = {43,532,6348};

matrixA.add_row(Arow1,sizeof(Arow1)/sizeof(int)); // Add row 1
matrixA.add_row(Arow2,sizeof(Arow2)/sizeof(int)); // Add row 2
matrixA.show();

TwoDimensionalMatrix<int> matrixB; // Create Object

int Brow1[] = {13498,449,333};
int Brow2[] = {2393,500,1232};

matrixB.add_row(Brow1,sizeof(Brow1)/sizeof(int)); // Add row 1
matrixB.add_row(Brow2,sizeof(Brow2)/sizeof(int)); // Add row 2
matrixB.show();

TwoDimensionalMatrix<int> result_matrix = matrixA.calc_sum(matrixB);

result_matrix.show();

Multiply two integer-matrices

TwoDimensionalMatrix<int> matrixA; // Create Object

int Arow1[] = {23,201,2333}; 
int Arow2[] = {43,532,6348};

matrixA.add_row(Arow1,sizeof(Arow1)/sizeof(int)); // Add row 1
matrixA.add_row(Arow2,sizeof(Arow2)/sizeof(int)); // Add row 2
matrixA.show();

TwoDimensionalMatrix<int> matrixB; // Create Object

int Brow1[] = {13498,449};
int Brow2[] = {2393,500};
int Brow3[] = {234,634};

matrixB.add_row(Brow1,sizeof(Brow1)/sizeof(int)); // Add row 1
matrixB.add_row(Brow2,sizeof(Brow2)/sizeof(int)); // Add row 2
matrixB.add_row(Brow3,sizeof(Brow3)/sizeof(int)); // Add row 3
matrixB.show();

TwoDimensionalMatrix<int> result_matrix = matrixA.calc_product(matrixB);

result_matrix.show();

ToDo

• Add inverse matrix-calculation for 2-Dimensional matrices
• Add arithmetic operations for 3-Dimensional matrices
• Add multiplication of 3D-matrices
• Add addition/subtraction of 3D-matrices