nrf_dsp_var_f32()

flt32_t nrf_dsp_var_f32	(	const flt32_t *	p_input,
		uint16_t	num,
		nrf_dsp_stat_ctx_f32_t *	p_ctx )

#include <include/nrf_edgeai/dsp/statistic/nrf_dsp_var.h>

Calculate Variance value of a floating-point vector.

This function uses internal accumulator of flt32_t size, for calculating sum of squares of values, so it will lose precision if values ​​less than 10e-4

Parameters

[in]	p_input	Pointer to the input vector
[in]	num	Number of samples in input vector
[in,out]	p_ctx	Optional pointer to the statistics context, this function will use p_ctx->value.sum for calculation if it exist the calculated value of variance will be written to context for further use

Returns

flt32_t Variance value of the vector