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Simple Example for a User Function without Global Part
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Goal: define a user function which implements a polynom
of 3rd order.
For details see: http://lmu.web.psi.ch/musrfit/user/MUSR/MusrFit.html#A_6_User_Functions
Implementation:
3 Files are needed:
1) A header file which defines your user function
interface.
In the example here it is called PUserFcn.h
Please rename it in your case to something more
sensible, e.g. PMyPoly.h. At the same time also
rename correspondingly the class name in your
header file, i.e. PUserFcn -> PMyPoly. This will
be at 4 places in the header file of this example.
2) The source file which defines your user function.
In the example here it is called PUserFcn.cpp
Please rename it accordingly to the header file.
In case the header file is called PMyPoly.h, the
source file will need to be called PMyPoly.cpp.
As for the header file, the class names need to
be adopted: PUserFcn -> PMyPoly.
In the source file change the operator implementation
(Double_t PUserFcn::operator()(Double_t t,
const std::vector<Double_t> ¶m) const)
to whatever you need.
3) There is another header file needed to generate
the necessary ROOT dictionary.
In this example it is called PUserFcnLinkDef.h
Here you only will need to find PUserFcn+ and
replace it with your class name, e.g. PMyPoly+
Generate Code:
You will find the Makefil.PUserFcn which generates
the needed shared library for your user function.
Again, if your user function is called PMyPoly, you
will need to replace things accordingly in the
Makefile, i.e.
Makefile.PUserFcn -> Makefile.PMyPoly
In the Makefile:
PUserFcn.o -> PMyPoly.o
PUserFcnDict.o -> PMyPolyDict.o
libPUserFcn.so -> libPMyPoly.so
To create the shared library do:
make -f Makefile.PUserFcn
on the command line. This should create a file
libPUserFcn.so.
Next call on the command line:
make -f Makefile.PUserFcn install
This will copy the shared library to the correct
place.
You also will need to make sure that the system is
finding the shared library, either by setting
LD_LIBRARY_PATH or by calling /sbin/ldconfig as
superuser/root assuming you are using linux.
Example msr-file:
You will find an example msr-file test-asy-MUS.msr
which is using PUserFcn. The example is UN-PHYSICALLY
it is just to show how to use a user function.
