Overview

This block computes the dot product (or inner product) between two vectors, the input and taps vectors. Given a set of num_points taps, the result is the sum of products between the two vectors. The result is a single value stored in the result address and is returned as a float.

Dispatcher Prototype

void volk_32f_x2_dot_prod_32f(float* result, const float* input, const float* taps,
unsigned int num_points) 

Inputs

• input: vector of floats.
• taps: float taps.
• num_points: number of samples in both input and taps.

Outputs

• result: pointer to a float value to hold the dot product result.

Example Take the dot product of an increasing vector and a vector of ones. The result is the sum of integers (0,9).

int N = 10; unsigned int alignment = volk_get_alignment();
 float* increasing = (float*)volk_malloc(sizeof(float)*N, alignment);
 float* ones = (float*)volk_malloc(sizeof(float)*N, alignment);
 float* out = (float*)volk_malloc(sizeof(float)*1, alignment);
 
 for(unsigned int ii = 0; ii < N; ++ii){
     increasing[ii] = (float)ii;
     ones[ii] = 1.f;
 }
 
 volk_32f_x2_dot_prod_32f(out, increasing, ones, N);
 
 printf("out = %1.2f\n", *out);
 
 volk_free(increasing);
 volk_free(ones);
 volk_free(out);
 
 return 0;