Re: Derivative help
- To: mathgroup at smc.vnet.net
- Subject: [mg39468] Re: Derivative help
- From: Paul Abbott <paul at physics.uwa.edu.au>
- Date: Mon, 17 Feb 2003 04:34:51 -0500 (EST)
- Organization: The University of Western Australia
- References: <email@example.com>
- Sender: owner-wri-mathgroup at wolfram.com
In article <b1dg35$7ar$1 at smc.vnet.net>,
"Steve Chiang" <stevezx at attbi.com> wrote:
> Hi, all. I'm new to Mathematica. I went to the help section for my
> question but it only further confused me. I'm basically trying to take the
> first derivative of (ln(x))^x. Here is my syntax: f = (ln(x))^x.
In contrast to most responses in this thread this syntax is ok -- as
long as you use TraditionalForm for input (under the Cell menu | Default
Input FormatType). Personally I prefer TraditionalForm for input and
> But then when I evaluate f ', it says nothing but ((ln(x))^x)' which is
> nothing new.
In TraditionalForm you could enter
f = (ln(x))^x
Alternatively, you can make f an explicit function of x,
f[x_] = (ln(x))^x
or make f a pure function.
f = Function[x, (ln(x))^x]
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