Re: Best syntax for derivative
- To: mathgroup at smc.vnet.net
- Subject: [mg96460] Re: Best syntax for derivative
- From: Alexei Boulbitch <Alexei.Boulbitch at iee.lu>
- Date: Sat, 14 Feb 2009 03:07:59 -0500 (EST)
Like this?
In[41]:= g[x_, y_, z_] := D[Sin[x y z], y];
g[x, y, z]
Out[42]= x z Cos[x y z]
or like this?
In[43]:= g[x_, y_, z_] := \!\(
\*SubscriptBox[\(\[PartialD]\), \(y\)]\ \(Sin[x\ y\ z]\)\);
g[x, y, z]
Out[44]= x z Cos[x y z]
??
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]
Many thanks in advance.
Aaron
--
Alexei Boulbitch, Dr., Habil.
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