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#include<iostream>
#include <cstdlib>
#include<fstream>
#include<iomanip>
#include<cmath>
#include<vector>
using namespace std;
vector<double> currentHistogramValues;
int main(int argc, char* argv[]) {
// argv[1] input file containing the list of files
// argv[2] output file containing the standard deviation and file name pair
// argv[3] data file path
// argv[4] data file postfix of metricname
if (argc < 3) {
cout<<"Please provide the parameters ./executable iputfilename outputfilename"<<endl;
exit(1);
}
ifstream inputFileNames(argv[1]);
ofstream outputFile(argv[2]);
string prefixPath(argv[3]);
string metricName(argv[4]);
if (inputFileNames.fail() == true) {
cout << "Input File can not be opened"<<endl;
exit(0);
}
outputFile<<left<<setw(30)<<"File Name"<<left<<setw(20)<<"Standard deviation"<<left<<setw(20)<<"Mean"<<endl;
string currentFileName;
while(inputFileNames>>currentFileName) {
string currentFileWithExtension = prefixPath + currentFileName + "/" + currentFileName + "_"+ metricName +".txt";
cout<<"File"<<currentFileWithExtension<<endl;
ifstream currentFile(currentFileWithExtension.c_str());
if (currentFile.fail() == true) {
cout << currentFileName + " cannot be opened"<<endl;
exit(0);
}
// N = sum(H_i) for i = 0 to M-1, M = number of samples in the histogram
// mean = 1/N*(sum(i*H_i)) for i = 0 to M-1
double currentValueOfHistogram;
double sumOfValues = 0.0;
currentHistogramValues.clear();
double i = 0.0;
double N = 0.0;
double M = 0.0;
while (currentFile >> currentValueOfHistogram) {
sumOfValues = sumOfValues + i*currentValueOfHistogram;
currentHistogramValues.push_back(currentValueOfHistogram);
N = N + currentValueOfHistogram;
i=i+1.0;
}
M = currentHistogramValues.size();
// mean
double mean = sumOfValues/N;
// sigma^2 = (sum( (i-mean)^2*H_i ) )/(N-1) for i = 0 to M-1
double standardDev = 0.0;
double sumSquaredResults = 0.0;
int j = 0;
for (i=0.0; i<M; i=i+1.0) {
sumSquaredResults += pow((i-mean), 2.0)*currentHistogramValues[j];
j++;
}
// standard deviation
standardDev = sumSquaredResults/(N-1);
standardDev = sqrt(standardDev);
outputFile<<left<<setw(30)<<currentFileName<<left<<setw(20)<<standardDev<<left<<setw(20)<<mean<<endl;
currentFile.close();
}
inputFileNames.close();
outputFile.close();
return(0);
}
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