Overview

Returns Argmin_i x[i]. Finds and returns the index which contains the fist minimum value in the given vector.

Note that num_points is a uint32_t, but the return value is uint16_t. Providing a vector larger than the max of a uint16_t (65536) would miss anything outside of this boundary. The kernel will check the length of num_points and cap it to this max value, anyways.

Dispatcher Prototype

void volk_32f_index_min_16u(uint16_t* target, const float* source, uint32_t num_points)

Inputs

• source: The input vector of floats.
• num_points: The number of data points.

Outputs

• target: The index of the fist minimum value in the input buffer.

Example

int N = 10;
uint32_t alignment = volk_get_alignment();
float* in = (float*)volk_malloc(sizeof(float)*N, alignment);
uint16_t* out = (uint16_t*)volk_malloc(sizeof(uint16_t), alignment);
 
for(uint32_t ii = 0; ii < N; ++ii){
    float x = (float)ii;
    // a parabola with a minimum at x=4
    in[ii] = (x-4) * (x-4) - 5;
}
 
volk_32f_index_min_16u(out, in, N);
 
printf("minimum is %1.2f at index %u\n", in[*out], *out);
 
volk_free(in);
volk_free(out);