Digital Signal Processing Library

Voice Lab

Program name: vector_multiply

Language: C

In file: vector_lib.c

Objective: Multiply a vector by a constant value

Usage: void vector_multiply(double *vector1, double value, int vector_width, double **vector2);

Parameters:

• vector1 - The pointer to the input vector array
• value - The constant value by which to multiply the vector elements
• vector_width - Number of elements in each vector
• vector2 - The pointer to the output vector array address

• void

Mathematical Description: v1 * c ---> v2

Comments: Routine is used to multiply a vector by a constant

User Comments

Code:

void vector_multiply(double *vector1, double value, int vector_width, double **vector2)
{
        int i;

        if(vector_width > MAX_VECTOR_WIDTH) {
                fprintf(stderr, "vector_width greater than MAX_VECTOR_WIDTH\n");
                fprintf(stderr, "Please increase MAX_VECTOR_WIDTH in vector_lib.h and recompile.\n");
                exit(-1);
        }

        for(i = 0; i < vector_width; i++){
                (*vector2)[i] = vector1[i] * value;
                number_muls++;
        }
        return;
}