matstat.h

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/*
 * Copyright (C) 2018 Eistec AB
 *
 * This file is subject to the terms and conditions of the GNU Lesser
 * General Public License v2.1. See the file LICENSE in the top level
 * directory for more details.
 */
 
#pragma once

 
#include <stdint.h>
 
#ifdef __cplusplus
extern "C" {
#endif

typedef struct {
    int64_t sum;        
    uint64_t sum_sq;    
    uint32_t count;     
    int32_t mean;       
    int32_t min;        
    int32_t max;        
} matstat_state_t;

#define MATSTAT_STATE_INIT (const matstat_state_t) { \
        .sum = 0, \
        .sum_sq = 0, \
        .count = 0, \
        .mean = 0, \
        .min = INT32_MAX, \
        .max = INT32_MIN, \
    }

void matstat_clear(matstat_state_t *state);

void matstat_add(matstat_state_t *state, int32_t value);

static inline int32_t matstat_mean(const matstat_state_t *state)
{
    return state->mean;
}

uint64_t matstat_variance(const matstat_state_t *state);

void matstat_merge(matstat_state_t *dest, const matstat_state_t *src);
 
#ifdef __cplusplus
}
#endif