#include <stdlib.h>
 
#include <stdio.h>
 
#include <TString.h>
 
#include <TGraph.h>
 
#include <TCanvas.h>
 
#include <TMultiGraph.h>
 
#include <math.h>
 
 
 
int IUdraw(const char *datoteka =  "C:/home/data/meritev-iv.dat"){
 
auto c1 = new TCanvas("c1","A Simple Graph Example",200,10,1400,1000);
 
double sigmaGauss = 0.3;
 
double xError = 0.5;
 
double rangeX = 5;
 
//c1->SetLogy(); 
 
//auto mg = new TMultiGraph();
 
 
 
// printf("#%s#\n", datoteka);
 
 /*
 
string s = datoteka;
 
s.erase(s.find_last_of("."), string::npos);
 
fprintf(stderr,"%s\n", s.c_str());
 
std::string key ("/");
 
string ime;
 
std::size_t found = s.rfind(key);
 
if (found!=std::string::npos) {
 
  ime = s.substr(found+1,s.length());
 
}
 
*/
 
TString ime = gSystem->BaseName(datoteka);
 
TString path = gSystem->DirName(datoteka);
 
ime.Remove(ime.Index(".dat"));
 
fprintf(stderr,"Ime=%s\n", ime.Data());
 
TString formatted = path + TString("/") + ime; // + TString(".png");
 
//formatted.Form("%s.png", );
 
fprintf(stderr,"png=%s\n", formatted.Data());
 
TString formattedGraph1;
 
TString formattedGraph2;
 
TString formattedGraph3;
 
TString formattedGraph4;
 
TString formattedGraph5;
 
TString formatted1;
 
TString formatted2;
 
TString formatted3;
 
TString formatted4;
 
TString formatted5;
 
 
 
for (Int_t d = 0; d<1; d++) {
 
  FILE * fp=fopen(datoteka,"r");
 
  if (!fp) continue;
 
  float f[4];
 
  Int_t j=0;   
 
  Int_t ndim=400;
 
  char line[400];  
 
  double fpXX[250];
 
  double fpYY[250];
 
//  Int_t k = 0;
 
  while (fgets(line,ndim,fp)!=NULL) {
 
        if (line[0] == '#') continue;
 
    sscanf(line,"%f%f%f%f",&f[0],&f[1],&f[2],&f[3]);
 
//      printf("%f %f %f %f \n",f[0],f[1],f[2],f[3]);
 
        fpXX[j]=f[2];
 
        fpYY[j]=f[3];
 
        j++;
 
  }
 
  // float *fpx =    new float[j+1];
 
  // float *fpy =    new float[j+1];
 
  // for (Int_t i=0; i<j-3; i++) { 
 
    // if (fpXX[i]!= 0) {
 
                // k++;
 
                // fpx[i]=fpXX[i+2];
 
                // fpy[i]=fpYY[i+2];
 
                // printf("%2.6f\t",fpx[i]);
 
                // printf("\n");
 
                // printf("%2.6f\t",fpy[i]);
 
                // printf("\n");
 
        // }
 
  // }
 
  fclose(fp);
 
  
 
  auto graf11 = new TGraph(); 
 
  graf11->SetMarkerStyle(20);
 
  graf11->SetDrawOption("AP");
 
  graf11->SetLineWidth(3);
 
  graf11->SetFillStyle(0);
 
  
 
  auto graf12 = new TGraph(); 
 
  graf12->SetMarkerStyle(20);
 
  graf12->SetDrawOption("AP");
 
  graf12->SetLineWidth(3);
 
  graf12->SetFillStyle(0);
 
  
 
  auto graf2 = new TGraph(); 
 
  graf2->SetMarkerStyle(20);
 
  graf2->SetDrawOption("AP");
 
  graf2->SetLineWidth(3);
 
  graf2->SetFillStyle(0);
 
  
 
  auto graf3 = new TGraph(); 
 
  graf3->SetMarkerStyle(20);
 
  graf3->SetDrawOption("AP");
 
  graf3->SetLineWidth(3);
 
  graf3->SetFillStyle(0);
 
  
 
  auto graf4 = new TGraph(); 
 
  graf4->SetMarkerStyle(20);
 
  graf4->SetDrawOption("AP");
 
  graf4->SetLineWidth(3);
 
  graf4->SetFillStyle(0);
 
  
 
  auto graf5 = new TGraph(); 
 
  graf5->SetMarkerStyle(20);
 
  graf5->SetDrawOption("AP");
 
  graf5->SetLineWidth(3);
 
  graf5->SetFillStyle(0);
 
  
 
  for (int i=0; i<j; i++) {
 
        if (fpYY[i]<=0) fpYY[i] = 1e-12;  
 
        graf11->SetPoint(i,fpXX[i],log(fpYY[i]));
 
        graf12->SetPoint(i,fpXX[i],log(fpYY[i]));
 
        graf5->SetPoint(i,log(fpYY[i]),fpXX[i]);
 
  }
 
  
 
  double max2 = 0;
 
  double max2x = 0;
 
  int k = 0;
 
  for (int i=0; i<j-1; i++) {
 
        if (fpYY[i]<=0) fpYY[i] = 1e-12;
 
        double x2 = (fpXX[i+1]+fpXX[i])/2;
 
        double y2 = (log(fpYY[i+1])-log(fpYY[i]))/(fpXX[i+1]-fpXX[i]);
 
        graf2->SetPoint(i,x2, y2);
 
        if (y2 > 1.1) {
 
                double y3 = 1 / y2;
 
                graf3->SetPoint(k,x2, y3);
 
                k++;
 
        }
 
        if (y2 > max2) {
 
                max2 = y2;
 
                max2x = x2;
 
        }
 
  }
 
  
 
  double max4 = 0;
 
  double max4x = 0;
 
  double x4stari = 0;
 
  double y4stari = 0;
 
  double x4novi = 0;
 
  double y4novi = 0;
 
  for (int i=0; i<j-2; i++) {
 
        if (fpYY[i]<=0) fpYY[i] = 1e-12;
 
        double x4 = (fpXX[i+2]+fpXX[i])/4+fpXX[i+1]/2;
 
        double y4 = ((log(fpYY[i+2])-log(fpYY[i+1]))/(fpXX[i+2]-fpXX[i+1]) - (log(fpYY[i+1])-log(fpYY[i]))/(fpXX[i+1]-fpXX[i]))/((fpXX[i+2]-fpXX[i])/2);
 
        if (i==0) {
 
                x4novi = x4;
 
                y4novi = y4;
 
        }
 
        else {
 
                x4novi = (x4 + x4stari)/2;
 
                y4novi = (y4 + y4stari)/2;
 
        }
 
        graf4->SetPoint(i,x4novi, y4novi);
 
        x4stari = x4;
 
        y4stari = y4;
 
        if (y4 > max4) {
 
                max4 = y4;
 
                max4x = x4;
 
        }
 
  }
 
}
 
 
 
TF1 *fa1 = new TF1("fa1","pol1",61,67);
 
fa1->SetParameters(-28.4467,0.0875386);
 
graf11->Fit("fa1", "R");
 
graf11->Draw("APL");
 
c1->Update();
 
TF1 *fa2 = new TF1("fa2","pol1",69.7,70.1);
 
graf11->Fit("fa2", "R+");
 
//graf12->Draw("APL");
 
printf("p0=%e, p1=%e\n", fa1->GetParameter(0), fa1->GetParameter(1));
 
double par0 = fa1->GetParameter(0);
 
double par1 = fa1->GetParameter(1);
 
printf("p2=%e, p3=%e\n", fa2->GetParameter(0), fa2->GetParameter(1));
 
double par2 = fa2->GetParameter(0);
 
double par3 = fa2->GetParameter(1);
 
double x1 = (par0 - par2)/(par3 - par1);
 
formattedGraph1.Form("I ( V ) -> %s, V(1) = %f ; V [V]; ln(I) [A]", ime.Data(), x1);
 
graf11->SetTitle(formattedGraph1);
 
graf12->SetTitle(formattedGraph1);
 
//graf13->Draw("APL");
 
formatted1.Form("%s-1.png", formatted.Data());
 
c1->SaveAs(formatted1);
 
 
 
auto c2 = new TCanvas("c2","A Simple Graph Example",200,10,1400,1000);
 
graf2->Draw("APL");
 
graf2->GetXaxis()->SetRangeUser(x1 - rangeX, x1 + rangeX);
 
TF1 *fa2 = new TF1("fa2","gaus(0)+pol1(3)",max2x - sigmaGauss, max2x + sigmaGauss);
 
 fa2->SetParameters(60,x1,0.1339,0,0);
 
 fa2->SetParLimits(1, max2x - sigmaGauss, max2x + sigmaGauss);
 
// fa1->SetParLimits(1, 10**(-14), 10**(-10));
 
 graf2->Fit("fa2", "R");
 
// printf("p20=%e, p21=%e, p22=%e, max2x=%f\n", fa2->GetParameter(0), fa2->GetParameter(1), fa2->GetParameter(2), max2x);
 
// double par2 = fa2->GetParameter(2);
 
// double par3 = fa2->GetParameter(3);
 
double x2 = fa2->GetParameter(1);
 
formattedGraph2.Form("I ( V ) -> %s, V(2) = %f ; Voltage [V]; d(ln(I)/dV)", ime.Data(), x2);
 
graf2->SetTitle(formattedGraph2);
 
formatted2.Form("%s-2.png", formatted.Data());
 
gStyle->SetOptFit(1);
 
c2->SaveAs(formatted2);
 
 
 
auto c3 = new TCanvas("c3","A Simple Graph Example",200,10,1400,1000);
 
graf3->Draw("APL");
 
graf3->Fit("pol3");
 
graf3->GetXaxis()->SetRangeUser(x1 - rangeX, x1 + rangeX);
 
TF1 *fa3 = new TF1("fa3", "pol1", x2, x2 + 0.5);
 
fa3->SetParameters(-30.6306,0.4398);
 
//fa3->SetParLimits(0, 10**(-14), 10**(-10));
 
//fa3->SetParLimits(1, 10**(-14), 10**(-10));
 
graf3->Fit("fa3", "R");
 
double n3 = fa3->GetParameter(0);
 
double k3 = fa3->GetParameter(1);
 
double x3 = - n3 / k3;
 
formattedGraph3.Form("I ( V ) -> %s, V(3) = %f ; Voltage [V]; 1/(d(ln(I)/dV))", ime.Data(), x3);
 
graf3->SetTitle(formattedGraph3);
 
//printf("p30=%e, p31=%e\n", fa3->GetParameter(0), fa3->GetParameter(1));
 
formatted3.Form("%s-3.png", formatted.Data());
 
c3->SaveAs(formatted3);
 
 
 
auto c4 = new TCanvas("c4","A Simple Graph Example",200,10,1400,1000);
 
graf4->Draw("APL");
 
graf4->GetXaxis()->SetRangeUser(x1 - rangeX, x1 + rangeX);
 
TF1 *fa4 = new TF1("fa4","gaus(0)",max4x - sigmaGauss, max4x + sigmaGauss);
 
 fa4->SetParameters(60,x2,0.1339);
 
 fa4->SetParLimits(1, x2 - xError, x2 + xError);
 
 fa4->SetParLimits(0, 0, 1000);
 
 graf4->Fit("fa4", "R");
 
// printf("p40=%e, p41=%e, p42=%e, max4x=%f\n", fa4->GetParameter(0), fa4->GetParameter(1), fa4->GetParameter(2), max4x);
 
// double par2 = fa2->GetParameter(2);
 
// double par3 = fa2->GetParameter(3);
 
double x4 = fa4->GetParameter(1);
 
formatted4.Form("%s-4.png", formatted.Data());
 
// TString stringx4;
 
// stringx4.Form("V(4) = %f", x4);
 
   // TText *t = new TText(60,70,stringx4);
 
   // t->SetTextAlign(22);
 
   // t->SetTextColor(1);
 
   // t->SetTextFont(43);
 
   // t->SetTextSize(20);
 
   // t->Draw();
 
formattedGraph4.Form("I ( V ) -> %s, V(4) = %f ; Voltage [V]; d^2(ln(I)/dV^2)", ime.Data(), x4);
 
graf4->SetTitle(formattedGraph4);
 
gPad->Modified(); gPad->Update(); 
 
c4->SaveAs(formatted4);
 
 
 
auto c5 = new TCanvas("c5","A Simple Graph Example",200,10,1400,1000);
 
graf5->Draw("APL");
 
TF1 *fa5 = new TF1("fa5","-[0] - [1]*x - [2]*x**2",par0 + par1*x1 +4,par0 + par1*x1+11);
 
// fa5->SetParameters(28.4467,0.0875386,4);
 
graf5->Fit("fa5", "R+");
 
printf("p4=%e, p5=%e, p6=%e\n", fa5->GetParameter(0), fa5->GetParameter(1), fa5->GetParameter(2));
 
double par4 = fa5->GetParameter(0);
 
double par5 = fa5->GetParameter(1);
 
double par6 = fa5->GetParameter(2);
 
double xx5 = - (double)(par5/(2*par6));
 
double x5 = - par4 - par5 * xx5 - par6 * xx5**2;
 
// double f5(double p);
 
// double f5(double p) {
 
        // double par0, par1, par4, par5, par6;
 
    // double a=-(double)(par0/par1) + (double)(1/par1) * p + par4 + par5 * p + par6 * p**2;
 
    // return a;
 
// }
 
// cout.precision(4);        
 
// cout.setf(ios::fixed);
 
// double a5,b5,cc5,e5,faa5,fb5,fc5; 
 
// a5 = x1-5;
 
// b5 = x1+5;
 
// e5 = 0.001;
 
    // if (f5(a5)*f5(b5)>0) print("No root exists between a and b.\n");
 
    // else {
 
    // while (fabs(a5-b5)>=e5) {
 
        // cc5=(a5+b5)/2.0;        //bisect the interval and find the value of c
 
        // faa5=f5(a5);
 
        // fb5=f5(b5);
 
        // fc5=f5(cc5);  
 
        // if (fc5==0) {
 
            // printf("The root of the equation is %f \n",cc5); 
 
            // break;
 
        // }
 
        // if (fa5*fc5>0) a5=cc5;
 
        // else if (fa5*fc5<0) b5=cc5;
 
    // }
 
    // }            //The loop ends when the difference between a and b becomes less than the desired accuracy ie now the value stored in 'c' can be called the approximate root of the equation         
 
    // printf("The root of the equation is %f \n",cc5);  
 
formattedGraph5.Form("V ( I ) -> %s, V(5) = %f ; ln(I) [A] ; V [V]", ime.Data(), x5);
 
graf5->SetTitle(formattedGraph5);
 
formatted5.Form("%s-5.png", formatted.Data());
 
c5->SaveAs(formatted5);
 
 
 
printf("RESULT: V(1) = %f, V(2) = %f, V(3) = %f, V(4) = %f, V(5) = %f", x1, x2, x3, x4, x5);
 
return 0;
 
}