GNU Radio Manual and C++ API Reference  3.7.7
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Overview

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

Dispatcher Prototype

void volk_32f_index_max_16u_a_sse4_1(unsigned int* target, const float* src0, unsigned int num_points)

Inputs

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

Outputs

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

Example

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