I'm using Feyncalc 8.2 with Mathematica 9 on Ubuntu 12.04
It seems to me like in the most recent FeynCalc version there is a problem
with applying the FeynArts patch, because $FeynArtsDirectory is not determined properly.
In my case it was "./Feyn-Arts-3.7" instead of
"/home/vsh/.Mathematica/Applications/HighEnergyPhysics/FeynArts-3.7/"
Of course I tried Rolf Merting's advice from
<https://mathematica.stackexchange.com/questions/23641/feyncalc-may-shadow-or-be-shadowed-by-other-definitions>
but that didn't solve the problem either.
So, if every time you load FeynCalc you are getting error messages like
Loop::shdw: "Symbol Loop appears in multiple contexts "
...
FeynAmp::shdw: "Symbol "FeynAmp" appears in multiple contexts "
...
and so on, you can try to do the following:
Quit kernel and delete .Mathematica/Applications/HighEnergyPhysics/ in you home directory.
Then install FeynCalc again by executing:
Import["http://www.feyncalc.org/install.m"]
After the installation finishes, quit kernel again. Now run
<< "HighEnergyPhysics`Phi`Extras`FAPatch`"
$FeynArtsDirectory = "/home/YOUR_USERNAME/.Mathematica/Applications/HighEnergyPhysics/FeynArts-3.7/"
HighEnergyPhysics`Phi`FAPatch`FAPatch[]
When the input dialog appears, enter "yes" and hit the OK button. Then you will get a pretty long text input listing
the files being patched.
Now you can quit kernel again and try loading FeynCalc
Needs["HighEnergyPhysics`FeynCalc`"]
You still get two warnings "Optional::opdef: The default value for the optional argument ..."
but there are no errors related to FeynArts anymore.
Hope that helps.
Cheers,
Vladyslav
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