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Science Forum Index » Math - Symbolic Forum » maxima newbie usage question
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| Jim |
 Posted: Mon Mar 31, 2008 10:01 am |
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Guest
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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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| rjf |
| Posted: Wed Apr 02, 2008 5:04 am |
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Guest
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On Mar 31, 1:01 pm, Jim <james.n.rec...@lmco.com> wrote:
Quote: 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.
to illustrate, sum(m[k],k,1,3) = m[1]+m[2]+m[3]. No k in there at
all.
If I have misunderstood your problem, restate it according to 1,2,3
above. |
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