statistics.hpp

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#ifndef STATISTICS_HPP
#define STATISTICS_HPP
 
#include "core/clockwerkerrors.h"
#include "core/safemath.h"
 
namespace warptwin {
 
    template <typename T>
    int mean(T* array, unsigned int size, T& result) {
        T sum = 0;
        T* val = array;
        for(unsigned int i = 0; i < size; i++) {
            sum += *val;
            val++;
        }
 
        return clockwerk::safeDivide(sum, (T)size, result);
    }
 
    template <typename T>
    int variance(T* array, unsigned int size, T& result) {
        // Calculate mean
        int err = mean(array, size, result);
        if(err) {return err;}
 
        T sum = 0;
        T var = 0;
        T* val = array;
        for(unsigned int i = 0; i < size; i++) {
            var = *val - result;
            sum += var*var;
            val++;
        }
 
        return clockwerk::safeDivide(sum, (T)(size - 1), result);
    }
 
    template <typename T>
    int stdev(T* array, unsigned int size, T& result) {
        // Calculate mean
        int err = variance(array, size, result);
        if(err) {return err;}
 
        double tmp;
        err = clockwerk::safeSqrt((double)result, tmp);
        result = (T)tmp;
        return err;
    }
 
    template <typename T>
    int max(T* array, unsigned int size, T& result) {
        if(size > 0) {
            result = *array;
        } else {
            return ERROR_DIMENSIONS;
        }
        T* val = array;
        for(unsigned int i = 0; i < size; i++) {
            if(*val > result) {
                result = *val;
            }
            val++;
        }
 
        return NO_ERROR;
    }
 
    template <typename T>
    int min(T* array, unsigned int size, T& result) {
        if(size > 0) {
            result = *array;
        } else {
            return ERROR_DIMENSIONS;
        }
        T* val = array;
        for(unsigned int i = 0; i < size; i++) {
            if(*val < result) {
                result = *val;
            }
            val++;
        }
 
        return NO_ERROR;
    }
 
}
 
#endif