whenever i try to plot a graph in root it looks like this. I ran a slit code which was on root primer and got this
ROOT Version: 6.26/10
Platform: Ubuntu 22
Compiler: Not Provided
Really weird, can you post the macro you are running ? and also the command you type to run it ?
I am using the sample fnslit code that is written in the root primer,
// Example drawing the interference pattern of light
// falling on a grid with n slits and ratio r of slit
// width over distance between slits.
auto pi = TMath::Pi();
// function code in C
double single(double *x, double *par) {
return pow(sin(pi*par[0]*x[0])/(pi*par[0]*x[0]),2);
}
double nslit0(double *x,double *par){
return pow(sin(pi*par[1]*x[0])/sin(pi*x[0]),2);
}
double nslit(double *x, double *par){
return single(x,par) * nslit0(x,par);
}
// This is the main program
void slits() {
float r,ns;
// request user input
cout << "slit width / g ? ";
scanf("%f",&r);
cout << "# of slits? ";
scanf("%f",&ns);
cout <<"interference pattern for "<< ns
<<" slits, width/distance: "<<r<<endl;
// define function and set options
TF1 *Fnslit = new TF1("Fnslit",nslit,-5.001,5.,2);
Fnslit->SetNpx(500);
// set parameters, as read in above
Fnslit->SetParameter(0,r);
Fnslit->SetParameter(1,ns);
// draw the interference pattern for a grid with n slits
Fnslit->Draw();
}
In your first post I find: *Platform:* Ubuntu 22
In your last post I find that you try to use ROOT built with: “c++ (Ubuntu ... 20.04 ...) 9.4.0”.
They will not play together.
You need ROOT binaries built for your system / compiler.