Digital Signal Processing Library

Voice Lab

Program name: matrix_reallocate

Language: C

In file: vector_lib.c

Objective: reallocate memory for a list of vectors

Usage: void matrix_reallocate(double ***matrix, double **matrix_data_ptr, int vector_width, int number_vectors_max);

Parameters:

• matrix - The pointer to the array of vectors
• matrix_data_ptr - Pointer to the actual data - Auxiliary pointer
• vector_width - Number of elements in each vector
• number_vectors_max - array allocated for this amount

Mathematical Description:

Comments: Routine is used to reallocate memory for a list of vectors

User Comments

Code:

void matrix_reallocate(double ***matrix, double **matrix_data_ptr, int vector_width, int *number_vectors_max)
{
        int i;

        /* increase maximum number of vectors permitted */
        (*number_vectors_max) += ADDITIONAL_QUANTITY;

        /* reallocate space for reading in the additional vectors */
        (*matrix_data_ptr) = realloc((*matrix_data_ptr), (*number_vectors_max) * vector_width * sizeof(double));
        if((*matrix_data_ptr) == NULL) {
                fprintf(stderr, "Cannot allocate memory for data\n");
                exit(1);
        }

        /* reallocate space for pointers to the additional vectors */
        *matrix = realloc(*matrix, (*number_vectors_max) * sizeof(double *));
        if(*matrix == NULL) {
                fprintf(stderr, "Cannot allocate memory for data\n");
                exit(1);
        }

        /* set pointers to point to array of data */
        for(i = 0; i < (*number_vectors_max); i++) {
                (*matrix)[i] = (*matrix_data_ptr) + (i * vector_width);
        }
}