Function handle of a sum

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Bernoulli Lizard
Bernoulli Lizard 2013-3-15
编辑： Matt J 2015-4-24
How can I define a function that involves a summation?
for example, a function f = @(x) e^(-n*x), where the function is a sum of terms over some range of n?
Thanks
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Bernoulli Lizard
Bernoulli Lizard 2013-3-15
Actually it's slightly more complicated than that. I need the function to be of another function of n, so something of the form
f = @(x) exp( -g(n) * x ), summed over some range of n.

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Matt J
Matt J 2013-3-15
编辑：Matt J 2013-3-15
Assuming g(n) has vectored input/output, just do
f=@(x) sum( exp( -g(1:n) .* x )); %sum over 1...n
with obvious modifications for different ranges of n.
  2 个评论
Bryan Engelhardt
Bryan Engelhardt 2015-4-24
编辑：Matt J 2015-4-24
The function doesn't work for me when integrating. In other words,
g = [1,2]
f = @(x) sum( exp( -g(1:2) .* x));
integral(f,0,1);
gives me a matrix dimension error. How do I fix this?
Matt J
Matt J 2015-4-24
编辑：Matt J 2015-4-24
g = [1,2]
f = @(x) sum( exp( -g(1:2) .* x));
F= @(X) arrayfun(f,X);
integral(F,0,1);
or
integral(f,0,1,'ArrayValued',1);

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