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Author: JimJim Date: Mar 31, 2008 13:01
I am attempting to do partial derivatives of a function in wxMaxima.
The function is:
e(x,y,ybar,m,s):=sum(ybar[l]*product(exp(-1/2*(x-m[k])^2/s[k]^2),k,
1,p),l,1,M)/sum(product(exp(-1/2*(x-m[k])^2/s[k]^2),k,1,p),l,1,M)-y;
I tried
diff(e(x,y,ybar,m,s), m[k])
and many variations with no luck.
I also looked through the documentation with no luck.
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Author: rjfrjf Date: Apr 2, 2008 08:04
On Mar 31, 1:01 pm, Jim lmco.com> wrote:> I am attempting to do partial derivatives of a function in wxMaxima.
> The function is:
> e(x,y,ybar,m,s):=sum(ybar[l]*product(exp(-1/2*(x-m[k])^2/s[k]^2),k,
> 1,p),l,1,M)/sum(product(exp(-1/2*(x-m[k])^2/s[k]^2),k,1,p),l,1,M)-y;
>
> I tried
> diff(e(x,y,ybar,m,s), m[k])
> and many variations with no luck.
>
> I also looked through the documentation with no luck.
1. try simplifying your problem.
2. try stating what response you got.
3. try stating what response you hoped to get.
It appears that you believe that m[k] occurs somewhere in sum(m[k],k,
1,p).
m[k] does not, because k is a logically bound variable inside the sum.
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