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 joesmithf1 8Jun2007 04:37

Stuck on Codes

Hi

Here is my project description:

By using a pointer to pointers **A and **B and the function calloc()
allocate the memory for the 4x4 matrices A[][] and B[][].
By using the pointers *a and *b and the function malloc()
allocate the memory for the 4-dimensional vectors a[] and b[].
Read the components of a and A from the given input file matrix.dat
(which is in the public/final directory; you need to copy it into your directory).
The first line of the input file contains the components of a. The rows of
matrix A are the last four lines of the input file. Print the components
of a[] and A[][]. By calling the function pmatrix(A,B,a,b,n), n=4,
which you will construct, determine the components of the matrix B=1.5*A*A, and the
vector b=(A*a)+0.5*a. Print the components of the matrix B and the vector b in the main.
Free dinamically allocated memory.
.................................................. ..............................
Output should look like:

Vector a is:
a[] = -1.200 1.200 -2.000 -0.500
Matrix A is:
2.700 1.500 3.200 2.400
-3.200 0.700 -2.600 4.300
1.400 0.600 2.100 -1.800
1.500 1.700 -2.600 -0.700
Matrix B is:
..... ...... ...... ......
..... ...... ...... ......
..... ...... ...... ......
..... ...... ...... ......
Vector b is:
b[] = ..... ..... ..... .....

My codes and I am stuck.

Code:

```//void prob3(double ***A, double ***B, double **a, double **b)  void prob3(void)  {         FILE *matrix;         int k;         double ***A, ***B, **a, **b;         matrix=fopen("matrix.dat", "r");         *A= (double**)malloc(sizeof(double*)*4);         *B= (double**)malloc(sizeof(double*)*4);         *a= (double*)malloc(sizeof(double)*4);         *b= (double*)malloc(sizeof(double)*4);         for(k=0; k<4; k++)                 {                 fscanf(matrix, "%lf %lf %lf %lf", &(*A)[k][0], &(*A)[k][1], &(*A)[k][2], &(*A)[k][3]);         }         for(k=0; k<4; k++)                 {                 fscanf(matrix, "%lf", &(*a)[k]);         }         matrix1(*A, *B, *a, *b, 4);  }  void problem3()  {         double **A, **B, *a, *b;         int row, col;         printf("\nMatrix B is:\n\n");         for(row=0; row<4; row++)                 {                 for(col=0; col<4; col++)                         {                         printf("%.3f ", B[row][col]);                 }         }         printf("\nVector b is: \n\n");         printf("a[] = ");         for(col=0; col<4; col++)                 {                 printf("%.3f ", b[col]);         }         for(row=0; row<4; row++)                 {                 free(A[row]);                 free(B[row]);         }         free(A);         free(B);         free(a);         free(b); }```

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