90 lines
2.8 KiB
Plaintext
90 lines
2.8 KiB
Plaintext
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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
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of 3rd order.
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For details see: http://lmu.web.psi.ch/musrfit/user/MUSR/MusrFit.html#A_6_User_Functions
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Implementation:
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3 Files are needed:
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1) A header file which defines your user function
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interface.
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In the example here it is called PUserFcn.h
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Please rename it in your case to something more
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sensible, e.g. PMyPoly.h. At the same time also
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rename correspondingly the class name in your
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header file, i.e. PUserFcn -> PMyPoly. This will
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be at 4 places in the header file of this example.
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2) The source file which defines your user function.
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In the example here it is called PUserFcn.cpp
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Please rename it accordingly to the header file.
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In case the header file is called PMyPoly.h, the
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source file will need to be called PMyPoly.cpp.
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As for the header file, the class names need to
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be adopted: PUserFcn -> PMyPoly.
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In the source file change the operator implementation
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(Double_t PUserFcn::operator()(Double_t t,
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const std::vector<Double_t> ¶m) const)
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to whatever you need.
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3) There is another header file needed to generate
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the necessary ROOT dictionary.
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In this example it is called PUserFcnLinkDef.h
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Here you only will need to find PUserFcn+ and
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replace it with your class name, e.g. PMyPoly+
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Generate Code:
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You will find the Makefil.PUserFcn which generates
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the needed shared library for your user function.
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Again, if your user function is called PMyPoly, you
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will need to replace things accordingly in the
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Makefile, i.e.
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Makefile.PUserFcn -> Makefile.PMyPoly
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In the Makefile:
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PUserFcn.o -> PMyPoly.o
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PUserFcnDict.o -> PMyPolyDict.o
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libPUserFcn.so -> libPMyPoly.so
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To create the shared library do:
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make -f Makefile.PUserFcn
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on the command line. This should create a file
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libPUserFcn.so.
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Next call on the command line:
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make -f Makefile.PUserFcn install
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This will copy the shared library to the correct
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place.
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You also will need to make sure that the system is
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finding the shared library, either by setting
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LD_LIBRARY_PATH or by calling /sbin/ldconfig as
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superuser/root assuming you are using linux.
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Example msr-file:
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You will find an example msr-file test-asy-MUS.msr
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which is using PUserFcn. The example is UN-PHYSICALLY
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it is just to show how to use a user function.
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