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Problem with If[] and %


If[ i^2+v^2>15, 15, i^2+v^2]
Plot3D[ %,{i,-5,5},{v,-5,5}]

does what I want. But i^2+v^2 is only an example for an
other more complex function which is derived in the steps
before.

Therefore I test

i^2+v^2
If[ % >15,15,%]
Plot3D[ %,{i,-5,5},{v,-5,5}]

Which only leads to several errors.

What do I have to do?

Hans Friedrich Steffani
--
Hans Friedrich Steffani
Institut fuer Elektrische Maschinen und Antriebe, TU Chemnitz-Zwickau
mailto:hans.steffani at e-technik.tu-chemnitz.de
http://www.tu-chemnitz.de/~hfst/


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