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Randy Silvers
11/03/08 2:48pm

Sure; user-defined functions have most of the same properties as the built-in functions.

Suppose you have y[x_]:=x^2 and z[x_]:=2x+Log[x]

Then,

L[x_]:=y[x]+z[x]

so that

L[e] returns

e^2+2e+1

If you want to differentiate,

D[L[u],u] returns 2+1/u+2u

Note that "x" is a local variable when defining functions, so you could have defined L using any name, and thus call on it using any other name. That name gets passed to the functions y and z as the argument of those functions.

URL: sirandol@deakin.edu.au,

Subject (listing for 'Writing one function in terms of another')
Author Date Posted
Writing one function in terms of another Ben Paterson 10/27/08 09:13am
Re: Writing one function in terms of another Randy Silvers 11/03/08 2:48pm
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