TMath library

Roofit and RooStats
1

Hi,

Is there a Math library for jacobi elliptical function sn(x,k)?

Thanks. Renato.

2

Hi,

These functions are not part of ROOT, maybe they can be derived from the elliptical integral, which is part of MathMore,

project-mathlibs.web.cern.ch/pro … 327bddf7d8

They are however provided by GSL, which is used by MathMore. See

gnu.org/software/gsl/manual/ … _0029.html

Lorenzo

3

Hi Lorenzo,

I installed GSL via command:

/.configure --disable-shared

make

apparently its compiled correctly,

but i can’t compile some functions, for example bessel functions:

[quote]#include “Math/SpecFunc.h”

void Bessel() {

TCanvas *c1 = new TCanvas("c1","bessel",200,10,700,500);
c1->SetFillColor(42);
c1->SetGrid();

// detalhes da função
j = new TF1("bessel0","ROOT::Math::cyl_bessel_j(0,x)",-1,1);
j->SetLineColor(1);
j->SetLineStyle(1);
j->SetLineWidth(4);
j->SetTitle("");


j->Draw();

}
[/quote]

I got some error, to know:

Error in TFormula::Compile: Bad numerical expression : "ROOT::Math::cyl_bessel_j(0,x)"
Error in TF1::TF1: function: bessel0/ROOT::Math::cyl_bessel_j(0,x) has 0 parameters instead of 1
Warning in TCanvas::ResizePad: c1 height changed from 64000 to 10

Error in TGaxis::PaintAxis: length of axis is 0
Error in TGaxis::PaintAxis: length of axis is 0
root [1] Warning in TCanvas::ResizePad: c1 height changed from 64000 to 10

Warning in TCanvas::ResizePad: c1 height changed from 64000 to 10

Whats the problem?

Renato.

4

Hi

Do you have LibMathMore built? You can check by doing

If it is buit, you can try by doing before running the script in the Root prompt:[code]

gSystem->Load(“libMathMore”)

[/code]

Lorenzo