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Sep24-10, 03:28 PM   #8
 
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Hm, for some reason, I still get the same error message when trying to plot the functions.

Btw:

"In[18]:=
totalfunction[3]

Out[18]=
Piecewise[{{5,False},{7,True},{7,True}}]"

Is there a way Mathematica can recognize that 3 is in the domain of the second function, and give its value at this function only?

This function will be a parameter in another function, so I only need the value of one of the piecewise it consists of, depending in which domain the value is.