This is a simple C program that creates a triangular matrix and prints it to the screen. The program is written in C and uses the C99 standard. This library is good to use for a quick and easy way to create a triangular matrix.

• TriangularMatrix* createTriangularMatrix(int n, int def): Creates a triangular matrix with size n and default value def
• void setTriangularMatrix(TriangularMatrix* tm, int i, int j, int x): Set value of matrix at position i, j
• void setTriangularMatrixIndex(TriangularMatrix* tm, int index, int x): Put the value of matrix without worrying about the order of i and j
• int getTriangularMatrix(TriangularMatrix* tm, int i, int j): Get value of matrix
• void displayTriangularMatrix(TriangularMatrix* tm): Display the matrix
• void destroyTriangularMatrix(TriangularMatrix* tm): Destroy the Triangular Matrix object

To use this library, simply download the TriangularMatrix.c and TriangularMatrix.h file and include it in your project. Then, you can use the createTriangularMatrix function to create a triangular matrix. The function takes in two parameters: the size of the matrix and the value to fill the matrix with. The function returns a pointer to the matrix.

// Create a matrix
TriangularMatrix* tm = createTriangularMatrix(4, 0);

// Set values
setTriangularMatrix(tm, 1, 1, 1);
setTriangularMatrix(tm, 2, 1, 2);
setTriangularMatrix(tm, 2, 2, 3);
setTriangularMatrix(tm, 3, 1, 4);
setTriangularMatrix(tm, 3, 2, 5);
setTriangularMatrix(tm, 3, 3, 6);
setTriangularMatrix(tm, 4, 1, 7);
setTriangularMatrix(tm, 4, 2, 8);
setTriangularMatrix(tm, 4, 3, 9);
setTriangularMatrix(tm, 4, 4, 10);

// Display the matrix
displayTriangularMatrix(tm);

// Get value
printf("Get value: %d\n", getTriangularMatrix(tm, 3, 2));

// Destroy the matrix
destroyTriangularMatrix(tm);

Output:

1 0 0 0
2 3 0 0
4 5 6 0
7 8 9 10
Get value: 5

And another example:

// Create a matrix
TriangularMatrix* tm2 = createTriangularMatrix(4, 0);

// Set values
setTriangularMatrixIndex(tm2, 0, 10);
setTriangularMatrixIndex(tm2, 1, 20);
setTriangularMatrixIndex(tm2, 2, 30);
setTriangularMatrixIndex(tm2, 3, 40);
setTriangularMatrixIndex(tm2, 4, 50);
setTriangularMatrixIndex(tm2, 5, 60);
setTriangularMatrixIndex(tm2, 6, 70);
setTriangularMatrixIndex(tm2, 7, 80);
setTriangularMatrixIndex(tm2, 8, 90);
setTriangularMatrixIndex(tm2, 9, 10);

// Display the matrix
displayTriangularMatrix(tm2);

// Get value
printf("Get value: %d\n", getTriangularMatrix(tm2, 3, 2));

// Destroy the matrix
destroyTriangularMatrix(tm2);

Output:

10 0 0 0
20 30 0 0
40 50 60 0
70 80 90 10
Get value: 50

That's it! You can now use the library to create a triangular matrix.

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