Overview

Returns Argmax_i x[i]. Finds and returns the index which contains the first maximum value in the given vector.

Dispatcher Prototype

void volk_32f_index_max_32u(uint32_t* target, const float* src0, uint32_t num_points)

Inputs

• src0: The input vector of floats.
• num_points: The number of data points.

Outputs

• target: The index of the first maximum value in the input buffer.

Example

int N = 10;
uint32_t alignment = volk_get_alignment();
float* in = (float*)volk_malloc(sizeof(float)*N, alignment);
uint32_t* out = (uint32_t*)volk_malloc(sizeof(uint32_t), alignment);
 
for(uint32_t ii = 0; ii < N; ++ii){
    float x = (float)ii;
    // a parabola with a maximum at x=4
    in[ii] = -(x-4) * (x-4) + 5;
}
 
volk_32f_index_max_32u(out, in, N);
 
printf("maximum is %1.2f at index %u\n", in[*out], *out);
 
volk_free(in);
volk_free(out);