1 | #include <iostream>
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2 | #include <stdlib.h>
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3 | #include <boost/accumulators/accumulators.hpp>
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4 | #include <boost/accumulators/statistics/stats.hpp>
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5 | #include <boost/accumulators/statistics/mean.hpp>
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6 | #include <boost/accumulators/statistics/variance.hpp>
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7 |
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8 | using namespace boost::accumulators;
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9 |
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10 | typedef accumulator_set<double, stats<tag::variance> > Var;
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11 | typedef accumulator_set<double, stats<tag::variance, tag::mean> > VarMean;
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12 |
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13 | Var accumulate_Var(double *v, int n) {
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14 | Var acc;
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15 | for(unsigned int i=0; i<n; i++) {
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16 | acc(v[i]);
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17 | }
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18 | return acc;
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19 | }
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20 |
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21 | VarMean accumulate_VarMean(double *v, int n) {
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22 | VarMean acc;
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23 | for(unsigned int i=0; i<n; i++) {
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24 | acc(v[i]);
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25 | }
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26 | return acc;
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27 | }
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28 |
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29 | int main(int argc, char *argv[]) {
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30 | int n=argc-1;
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31 | double x[n];
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32 | for (int i=1; i<=n; i++) {
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33 | x[i-1] = atoi(argv[i]);
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34 | }
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35 |
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36 | std::cout << " var: " << variance(accumulate_Var(x, n)) << std::endl;
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37 | std::cout << "VarMean: " << variance(accumulate_VarMean(x, n)) << std::endl;
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38 |
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39 | return 0;
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40 | }
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