Trouble getting started with the TLinearFitter class

ROOT
1

Hello,

I am having trouble using the TLinearFitter class.

This trouble is really fundamental. So, I expect, that I
am not setting this up correctly.

Can anyone give me a short example of how to use this class?

Here is my sample code. It won’t compile.

#include “TLinearFitter.h”
#include “TApplication.h”

int main(int argc,char **argv){

TApplication theApp(“App”, &argc, argv);

TLinearFitter *lf = new TLinearFitter();

return 0;

}

Given tha compiler command:
g++ -o lfTest -L/home/demiller/ROOT5.06.00/root/lib -lCore -lCint -lHist -lGraf -lGraf3d -lGpad -lTree -lRint -lPostscript -lMatrix -lPhysics -lGui -pthread -lm -ldl -rdynamic -pthread -I/home/demiller/ROOT5.06.00/root/include lfTest.cc

I get these compiler errors:
/tmp/ccmmrlKS.o(.text+0x4e): In function main': : undefined reference toTLinearFitter::TLinearFitter()'
collect2: ld returned 1 exit status

What have I left out?

Thank you.

-David Eric Miller

2

You forgot -lMinuit in your link procedure.

To find the library containing a class look at $ROOTSYS/etc/system.rootmap, eg

grep TLinearFitter *.rootmap
The library is the first one referenced in the list of libs, the others in the list are the libs required also

Rene

3

Hello.

Thank you Rene. This is indeed the problem.

I am curious, however. The actual command I used to compile was not:

g++ -o lfTest -L/home/demiller/ROOT5.06.00/root/lib -lCore -lCint -lHist -lGraf -lGraf3d -lGpad -lTree -lRint -lPostscript -lMatrix -lPhysics -lGui -pthread -lm -ldl -rdynamic -pthread -I/home/demiller/ROOT5.06.00/root/include lfTest.cc

But rather:
g++ -o lfTest root-config --cflags root-config --glibs lfTest.cc

Is there another root-config --???? I can use to make this process more
automatic?

Thanks again,

-David Eric Miller