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almost ok


Hello everybody,

Could you please help me with the following ...

I wish to define functions to switch between several output Format.

Everything is almost ok:

defaultFFelem[]:=(Format[FF[c_,p_][d_]]=.)

customFFelem[]:=(Format[FF[c_,p_][d_]]:=Subscripted[d[c]])

But executing defaultFFelem[] when the Format is already "cleared" ends
with the message

Unset::"norep": 
    "Assignment on \!\(FF\) for \!\(MakeBoxes[\(\(\(FF[\(c_, \
p_\)]\)[d_]\), FormatType_\)]\) not found."

Is there a test to avoid this message, or an alternative way?

Thank you very much.

Antoine.






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