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# How to obtain values symbolically

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Vicky el 22 de Feb. de 2013
Hi! Im using Matlab version 7.9.0(R2009b) and i would like to sum e.g. first 10 terms of expression c_i*x^i, where c_i should be obtained symbolically. how should i do that, so that this expression is dependent on x / function of x (so when i enter exact number for x, i get real number - not expression with c_i).

### Respuestas (2)

Azzi Abdelmalek el 22 de Feb. de 2013
Editada: Azzi Abdelmalek el 22 de Feb. de 2013
EDIT
c=sym('c',[1 10])
x=sym('x')
f=@(x,n)sum(c(1:n).*x.^(1:n))
f(x,5)
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Walter Roberson el 23 de Feb. de 2013
If that is the complete instruction you are given, then the c_i are just the symbolic variables, and you will not be able to complete the second part.
If there are instructions before that point, then you might be able to proceed further.
Vicky el 23 de Feb. de 2013
there should be sth else, but i cant find the answer...thank You, Walter, anyway.

bym el 23 de Feb. de 2013
alternative:
c =sym(1:10)
f = @(x) sum(c.*x.^(1:length(c)));