Error in cling::MetaProcessor

gorchakov · July 7, 2016, 7:27am

Hello,
I’ve installed on my PC:

ROOT 6.06/04 root.cern.ch Built for linuxx8664gcc

and when I start a new session then I get immediately the message:

Error in cling::MetaProcessor: cannot read input from a (likely) binary file!

Is it possible to fix this problem?

Regards
Oleg

couet · July 7, 2016, 7:54am

Just after having entered ROOT or you typed some commands ?
Can you give here the complete listing of error messages you get ?

gorchakov · July 7, 2016, 12:56pm

Hello,

this message appears before the first command line prompt of ROOT:

go-73-92/home/gorchakov>root

Try ‘.help’, ‘.demo’, ‘.license’, ‘.credits’, ‘.quit’/’.q’

Error in cling::MetaProcessor: cannot read input from a (likely) binary file!
2root [0]

Regards

Axel · July 7, 2016, 1:46pm

Hi,

do you have a rootlogon.C file? Does the same error show when you run “root -n”?

Cheers, Axel.

gorchakov · July 8, 2016, 7:27am

Yes.
I’ve got it but it was empty and I’ve found that the empty rootlogon.C causes that error message.
I’ve deleted rootlogon.C and the message has disappeared.

Thank you.
Regards
Oleg

couet · July 8, 2016, 7:32am

I have tried with the master (on Mac). An empty rootlogon.C. gives me:

$ ls rootlogon.C
ls: rootlogon.C: No such file or directory
$ touch rootlogon.C
$ root
   ----------------------------------------------------------------
  | Welcome to ROOT 6.07/07                    http://root.cern.ch |
  |                                   (c) 1995-2016, The ROOT Team |
  | Built for macosx64                                             |
  | From heads/master@v6-07-06-819-gb25ae13, Jul 07 2016, 14:58:03 |
  | Try '.help', '.demo', '.license', '.credits', '.quit'/'.q'     |
   ----------------------------------------------------------------

warning: cannot find function 'rootlogon()'; falling back to .L
root [0]

gorchakov · July 11, 2016, 2:15pm

Hi,
empty, I mean
{
}

Regards
Oleg

Hemant · July 13, 2016, 9:01pm

Hello , I am new here. I was trying to plot momentum § vs beta (B), it says Error in TF1::TF1: can not find any function at the address 0x11fc7d8. This function requested for lin. I cannot fix it , can any one help me please.
here is my code.

#include "TF1.h" #include "TCanvas.h" #include "TMath.h" void momentumplot() { double m=1.008, B, p; TCanvas* myplot = new TCanvas("myplot","", 600,600); double B = p/(TMath::Sqrt(p*p+m*m)); TF1* mom = new TF1("mom", "B",0,1,100); //B = p/(Sqtr(p*P+m*M)); mom->Draw(); mom->Print(); mom->Fill(); mom->SetTitle("Plot of Beta(B) vs P"); }
…
thanks in Advance.

Pepe_Le_Pew · July 13, 2016, 9:22pm

{ // https://root.cern.ch/doc/master/classTF1.html TF1 *mom = new TF1("mom", "x/TMath::Sqrt(x*x+[0]*[0])", 0, 1); mom->SetParName(0, "m"); mom->SetParameter(0, 1.008); mom->Draw(); }

Hemant · July 13, 2016, 9:41pm

[quote=“Pepe Le Pew”]{ // https://root.cern.ch/doc/master/classTF1.html TF1 *mom = new TF1("mom", "x/TMath::Sqrt(x*x+[0]*[0])", 0, 1); mom->SetParName(0, "m"); mom->SetParameter(0, 1.008); mom->Draw(); }[/quote]
Thanks Pepe,
this gives the output. I was wondering why it doesn’t work when I place ‘m’ and give its value at the begining.
here you define m as [0] and set at last right.
Also when i tried b = x/TMath::Sqrt(xx+[0][0]), inside it doesn’t give any plot and just draw the canvas. I was wondering is this 2-D plot. Actually I want to plot b with x. how can I do that
?
Thank you again.

Hemant · July 14, 2016, 8:40pm

Hello I wanted to plot I = sin^2(theta)/(1-betacos(theta)), where cos(theta) = (sqrt(1+24beta^2)-1)/(4beta), and beta is given as 0, 0.2, 0.9. here is the code I have written. This code doesn’t work. can anyone help me please.
Thanks in advance.
void filename()
{
TCanvas plot = new TCanvas(“plot”, “”, 600,600);
Double_t B = 0.2;
Double_t phi = (TMath::Sqrt(1+24BB)-1)/(4B);
theta = TMath::ACos(phi);
//TF1 f1 = new TF1(“f1”,“TMath::Sin(theta)TMath::Sin(theta)/(1-BTMath::Cos(theta))”);
Double_t x = TMath::Sin(theta)TMath::Sin(theta)/(1-BTMath::Cos(theta));
Draw(“x”);
}

Pepe_Le_Pew · July 15, 2016, 7:56am

TF1

Hemant · July 15, 2016, 7:41pm

Thanks Pepe,
I am still confused, I went through all those TF1 files. I need to calculate x first and then use it on the equation and need to plot it.I have different values of B. Here is the code I used , it gives output but is different than it should be.
my question is can we use x in the function defined this way?
Thanks again.
{
TCanvas* plot = new TCanvas(“plot”, “”, 600,600);
Double_t B = 0.2;
Double_t phi = (TMath::Sqrt(1+24BB)-1)/(4B);
Double_t x = TMath::ACos(phi);
//TF1 f1 = new TF1(“f1”,“TMath::Sin(theta)TMath::Sin(theta)/(1-BTMath::Cos(theta))”);
//Double_t x = TMath::Sin(th)TMath::Sin(th)/(1-BTMath::Cos(th));
TF1* f1 = new TF1(“f1”,“TMath::Sin(x)*TMath::Sin(x)/(1-[0]*TMath::Cos(x))”,0,10);
f1->SetParameter(0,0.2);
f1->Draw();
}

Pepe_Le_Pew · July 15, 2016, 8:07pm

// root [0] .x filename.cxx #include "TMath.h" #include "TF1.h" Double_t myfunction(Double_t *x, Double_t */*par*/) { Double_t B = x[0]; Double_t phi = (B ? (TMath::Sqrt(1.+24.*B*B)-1.)/(4.*B) : 0.0); return (1.-phi*phi)/(1.-B*phi); } void filename(void) { // https://root.cern.ch/root/html/TF1.html TF1 *f1 = new TF1("f1", myfunction, 0.0, 1.0, 0); f1->Draw(); }

Hemant · July 18, 2016, 7:34pm

Thanks Pepe,
I still did not get any output and I was wondering why did you return … return (1.-phiphi)/(1.-Bphi); This time I did not get the error message but it doesn’t show any output. Again here is my code.
#include “TMath.h”
#include "TF1.h"
void momentumplotcorrect()
{
Double_t myFucntion(Double_t *x, Double_t y)
{
Double_t B = x[0]; //I did not understand this line also, would you mind to explain.
Double_t phi = ((TMath::Sqrt(1.+24.BB)-1.)/(4.B):0.0);
return (1.-phiphi)/(1.-Bphi);
}
void momentumplotcorrect(void)
{
Double_t y = TMath::ACos(phi);

TF1*f1 = new TF1(“f1”, “TMath::Sin(y)*TMath::Sin(y)/(1-[0]*TMath::Cos(y))”, 0.0,1.0,0);
f1->Draw();
f1->Print();
}
}
//here y act as theta in the original equation.
I am really sorry for these simple question, I am new in root. I really appreciate your help.
Thanks again.

Pepe_Le_Pew · July 18, 2016, 7:56pm

I have no idea what you are trying to do.

Copy the whole example source code from my previous post in this thread (without any modifications) into a new file called “filename.cxx”, then start ROOT and then execute:
root [0] .x filename.cxx

BTW. // the conditional ?: (ternary) operator used like this phi = (B ? (TMath::Sqrt(1.+24.*B*B)-1.)/(4.*B) : 0.0); // is equivalent to if (B != 0.0) {phi = (TMath::Sqrt(1.+24.*B*B)-1.)/(4.*B);} else {phi = 0.0;}

Hemant · August 3, 2016, 7:18pm

Hello all,
I am having trouble to plot date on my data file in root. Is there any best way to do this? I have attached my data shell below. I want to plot first column vs second , second vs four and so on. If I can get idea to plot any two column then I can do rest.
Thanks in advance.
maindata.txt (1.46 KB)

Pepe_Le_Pew · August 3, 2016, 7:30pm

{ // https://root.cern.ch/root/html/TTree.html TTree *t = new TTree("t", "my tree"); t->ReadFile("maindata.txt", "a/D:b:c:d"); t->SetMarkerStyle(20); t->SetMarkerSize(0.5); t->SetMarkerColor(kRed); // https://root.cern.ch/root/html/TCanvas.html TCanvas *c1 = new TCanvas("c1", "my canvas"); c1->Divide(2, 2); c1->cd(1); t->Draw("b:a"); c1->cd(2); t->Draw("b:d"); c1->cd(3); t->Draw("c:a"); c1->cd(4); t->Draw("d:c:b:a"); // "a" encodes the markers' color c1->cd(0); }

Hemant · August 5, 2016, 3:20am

Thanks Pepe.
It works.