RE: Using the Normal Distribution in Maxima



There is a program to allow you to define a derivative
of an otherwise unknown function. Read about gradef.
RJF


Barton Willis wrote:

> Maybe you would like to use the positional derivative package.
> 
> (%i1) load("pdiff");
> (%o1) C:/PROGRA~1/MAXIMA~1.1/share/maxima/5.9.1
> /share/contrib/pdiff/pdiff.lisp
> (%i2) diff(n(f(x)),x);
> (%o2) f[(1)](x)*n[(1)](f(x))
> (%i3) subst(dn, pderivop(n,1),%);
> (%o3) f[(1)](x)*dn(f(x))
> 
> Notes:
> 
> (a) I used function names n and dn instead of N and n because
> Maxima 5.9.1 sometimes confuses lower and upper case.
> 
> (b) I used wxMaxima to copy the Maxima data. On the screen,
> f[(1)] looks like f subscript (1).
> 
> (c) pdiff is in Maxima 5.9.1, but it might not be missing in
> earlier versions.
> 
> (d) In the folder /share/maxima/5.9.1/share/contrib/pdiff/ there
> is user documentation for pdiff.  Look for the pdf file.
> 
> Barton
> 
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