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Dwarf
Posts:
22
Registered:
12/7/04


Piecewise Functions
Posted:
Aug 1, 1996 2:07 AM


I am trying to use Mma to solve a model where the system behaves a certain way up to a point, and an entirely different way after that point. The result is something like:
f[x_/;x<4]:=0 f[x_/;x>=4]:=InterpolatingFunction<<...>>
This part I can get to work no problem. For part of my analysis, I would like to take the derivative of the function, but all I get is an identity
In[5] f'[x]
Out[5] f'[x]
Can anyone help?
++   I understand mine's a risky plan,  Greg Anderson  and your system can't miss  dwarf@wam.umd.edu  but is security, after all a cause  timbwolf@eng.umd.edu  or symptom of happiness.   ++ Dream Theater  A Matter of Time



