RE: Using the Normal Distribution in Maxima

Hi,

I got answers from Ray and Rob, advising that I should use the erf function. Thanks very much.

However, I wish to see the result expressed in terms of the pdf, for syntactic and other practical reasons. Can I do the following:

- define a function myself, just simply called N(x)
- tell Maxima that dN=n, i.e. that if it encounters N during differentiation, it should just return n
- and then differentiate as below

Maxima doesn't have to know what N is (i.e. for example that N(x)=1/2 erf(x/sqrt(2)) .

Is this possible ? If so, how could I go around doing this ?

Thanks again in advance,
Tolga

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>  -----Original Message-----
> From: 	Uzuner, Tolga  
> Sent:	06 September 2005 18:25
> To:	'maxima@math.utexas.edu'
> Subject:	Using the Normal Distribution in Maxima
> 
> Dear Fellow Maxima Users,
> 
> I have an equation that I wish to differentiate symbolically which involves the Normal Distribution Function. How can I achieve this in Maxima ?
> 
> Example:
> 
> y=N(f(x))
> 
> dy/dx=n(f(x))*f`(x)
> 
> Many thanks in advance,
> Tolga
> 

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