Exercise: Matrix Functions

Write code to solve problem.

Question

Below is a program that uses a C structure called Matrix to represent a two-dimensional matrix. This structure contains an array data to store matrix values and two variables (nrows and ncols) to store the dimensions of the matrix.

Assume that the matrix data is stored in the array data row-wise (row by row). As we haven’t covered dynamic allocation of memory yet, for now, we assume a matrix can hold a maximum number of values equal to 1024.

You’ll be required to write two functions. One will be for printing a matrix and another for multiplying two matrices.

Task 1:

Your first task is to write a function printMatrix that prints a matrix to the screen. A function skeleton for printMatrix is provided.

Your function will be called on two matrices. Here’s the expected output.
```
[
 1.200  2.300 
 3.400  4.500 
 5.600  6.700 
]

[
 5.500  6.600  7.700 
 1.200  2.100  3.300 
]
```
Task 2:

Your next task is to write a function matrixMult that performs matrix multiplication. A function skeleton is provided for this function.

Your function will be applied to two matrices and the output will be printed. Here is an example of what the output of your finished program might look like:
```
 [
  9.360 12.750 16.830 
  24.100 31.890 41.030 
  38.840 51.030 65.230
 ] 
```

Exercise: Matrix Functions

Write code to solve problem.

Question

You’ll be required to write two functions. One will be for printing a matrix and another for multiplying two matrices.

Task 1:

Your first task is to write a function printMatrix that prints a matrix to the screen. A function skeleton for printMatrix is provided.

Your function will be called on two matrices. Here’s the expected output.
```
[
 1.200  2.300 
 3.400  4.500 
 5.600  6.700 
]

[
 5.500  6.600  7.700 
 1.200  2.100  3.300 
]
```
Task 2:

Your next task is to write a function matrixMult that performs matrix multiplication. A function skeleton is provided for this function.

Your function will be applied to two matrices and the output will be printed. Here is an example of what the output of your finished program might look like:
```
 [
  9.360 12.750 16.830 
  24.100 31.890 41.030 
  38.840 51.030 65.230
 ] 
```

Similar Problems

Variable Length Arrays

Command-Line Arguments

Structures

Flexible Array Members and Anonymous Structs

Exercise: Input via Command Line

Quiz on Complex Data Types

Writing to Arrays

Multidimensional Arrays

#include <stdio.h>
typedef struct {
  double data[1024]; // One-dimensional array stores data row-by-row
  int nrows;            // Number of rows
  int ncols;            // Number of columns
} Matrix;
void printMatrix(Matrix M);
Matrix matrixMult(Matrix A, Matrix B);
int main(void)
{
  Matrix A = { {1.2, 2.3,
                3.4, 4.5,
                5.6, 6.7},
               3,
               2};
  Matrix B = { {5.5, 6.6, 7.7,
                1.2, 2.1, 3.3},
               2,
               3}; 
  printMatrix(A);
  printMatrix(B);
  //  Matrix C = matrixMult(A, B);
  //  printMatrix(C);
  return 0;
}
// Your code goes below...
void printMatrix(Matrix M)
{
  // Fill in the code here
  printf("So far printMatrix does nothing\n");
}
Matrix matrixMult(Matrix A, Matrix B)
{
  // Fill in the code here
  printf("So far matrixMult does nothing\n");
  Matrix C;
  return C;
}