Re: Numerical Evaluation
- To: mathgroup at smc.vnet.net
- Subject: [mg85646] Re: Numerical Evaluation
- From: David Moran <dmoran21 at cox.net>
- Date: Sun, 17 Feb 2008 07:19:51 -0500 (EST)
- References: <fp6724$58p$1@smc.vnet.net>
Bill Rowe wrote:
> On 2/14/08 at 6:51 PM, dmoran21 at cox.net (David Moran) wrote:
>
>> Hi, I need to know what the best way to do this is. I have a
>> function and I want to evaluate a derivative (not necessarily the
>> first derivative) of the function. What is the best way to do this?
>
> Is there a problem with using the built in operator D?
>
> For example, a second derivative is computed as follows:
>
> In[1]:= D[x^3 + x Sin[x], {x, 2}]
>
> Out[1]= -sin(x) x+6 x+2 cos(x)
>
> And this can be used to give a numerical result by simply using
> a replacement rule, i.e., for x = 2.5 the result is:
>
> In[2]:= D[x^3 + x Sin[x], {x, 2}] /. x -> 2.5
>
> Out[2]= 11.9015
>
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>
Thanks.
Dave