Defining a function from a derivative?

• Subject: Defining a function from a derivative?
• From: Alasdair McAndrew
• Date: Sun, 7 May 2006 01:07:32 +1000

How do I create a function from a derivative?  For example, if I have a
function, say f(x):=x^3+x^2; then I can find its derivative with
diff(f(x),x); but how do I turn this into a function?  I can do it with
df(x):=subst(x,t,diff(f(t),t)): but that seems very clumsy.

Thanks,
Alasdair

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