Re: Best syntax for derivative

• To: mathgroup at smc.vnet.net
• Subject: [mg96416] Re: [mg96386] Best syntax for derivative
• From: Aaron Fude <aaronfude at gmail.com>
• Date: Fri, 13 Feb 2009 03:42:39 -0500 (EST)
• References: <200902121141.GAA08658@smc.vnet.net> <49943ED6.6070407@wolfram.com>

```Thanks. That's cool. May I ask a follow up question?

What if I want to have  g=f^2?

Is there a similar alternative to

g[x_, y_, z_] := f[x, y, z]^2?

Thanks again!

On Thu, Feb 12, 2009 at 10:23 AM, Carl Woll <carlw at wolfram.com> wrote:

> Aaron Fude wrote:
>
> Hi,
>>
>> Suppose I have a function of three variables
>>
>> f[x_, y_, z_]:=Sin[x y z]
>>
>> And I want to construct g[x, y, z] which is the partial derivative of f
>> [] with respect to y. I do
>>
>> f[x_, y_, z_] := Sin[x y z]
>> g[x_, y_, z_] := D[f[x, temp, z], temp] /. temp -> y
>>
>> but I'm sure there is something better. Something along the lines of
>>
>> g = Partial[f, 2]
>>
>>
>> Aaron
>>
>>
>>
> It's:
>
> g = Derivative[0, 1, 0][f]
>
> Carl Woll
> Wolfram Research
>

```

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