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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
> 
> --
> To reply via email subtract one hundred and four
> 

Thanks.

Dave


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