I would like to add tick marks and labels in between the tick marks on top of my plot. At the moment, I am trying to test out this as you see below.
# include <iostream>
# include <fstream>
# include <math.h>
# include <iomanip>
# include <cmath>
# include <stdlib.h>
# include <cstdlib>
//# include <fstream.h>
# include <string.h>
# include <string>
//# include <dos.h> //For Sleep()
# include "TROOT.h"
# include "TFile.h"
# include "TTree.h"
# include "TBrowser.h"
# include "TH1.h"
# include "TH2.h"
# include "TH3.h"
# include "TGraph2D.h"
# include "TRandom.h"
int main(){
//////Controls//////
const char *inputFileName = "test_500.dat";
/////////////////////////////////////////////////////////////////
// create the coordinate arrays
vector<double> ages;
vector<double> zones;
vector<double> log_LHes;
vector<double> dx;
vector<double> dy;
vector<double> dz;
ifstream inFile(inputFileName);
if(inFile.is_open()){
cout<<"Input File was opened successfully"<<endl;
}
//Main loop filling arrays from file//
double lineage, linezone, lineHe;
while (inFile>>lineage>>linezone>>lineHe) {
ages.emplace_back(lineage);
zones.emplace_back(linezone);
log_LHes.emplace_back(lineHe);
dx.emplace_back(0);
dy.emplace_back(0);
dz.emplace_back(0);
}
cout << "Read " << ages.size() << " lines\n";
gStyle->SetPalette(62);
TCanvas *c1 = new TCanvas("c1","log_LHe vs zone and age",200,10,1200,1000);
TLatex latex;
latex.SetTextSize(2);
latex.SetTextAlign(13); //align at top
latex.DrawLatex(.2,1.4,"K_{S}");
TGraph2DErrors *gr = new TGraph2DErrors(ages.size(),&ages[0],&zones[0],&log_LHes[0],&dx[0],&dy[0],&dz[0]);
gr->SetTitle("log_LHe;star age (Gyr);zone number");
gr->GetXaxis()->SetRangeUser(12.75403,12.88079);
gPad->Modified();
gr->Draw("colz");
return 0;
}
However, when I go ahead and run my code, I see none of my sample latex text on my canvas. What am I missing? How can I put text and the tick marks above the plot?
Perhaps I should clarify what I mean by tick marks. Let’s say I want to a tick mark on the top horizontal line of the plot at the x axis value (star age value) of 12.75403. Is there a way to specifically place tick marks on top of the plot at a point that correlates with an x value?
I attempted to do this with the modification, after reading here:
c1->Update();
c1->Range( 0., -500., 30., 500. );
auto line = TLine(12.75403,0,12.75403,500);
line.SetLineColor(kYellow);
line.SetLineWidth(2);
line.Draw();
@couet Sorry, one more thing. Perhaps you already noticed, but the line
gr->GetXaxis()->SetRangeUser(12.75403,12.88079);
is not changing my x axis to only show that range. Does this line only work for histograms only? If so, how could I change the x axis range without histograms?
