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How to obtain values symbolically

Asked by Vicky

Vicky (view profile)

on 22 Feb 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).

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Vicky

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2 Answers

Answer by Azzi Abdelmalek

Azzi Abdelmalek (view profile)

on 22 Feb 2013
Edited by Azzi Abdelmalek

Azzi Abdelmalek (view profile)

on 22 Feb 2013

EDIT

c=sym('c',[1 10])
x=sym('x')
f=@(x,n)sum(c(1:n).*x.^(1:n))
f(x,5)

8 Comments

Azzi Abdelmalek

Azzi Abdelmalek (view profile)

on 23 Feb 2013

Ity seems like a homework, I think you get enough help to finish the work.

Walter Roberson

Walter Roberson (view profile)

on 23 Feb 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

Vicky (view profile)

on 23 Feb 2013

there should be sth else, but i cant find the answer...thank You, Walter, anyway.

Azzi Abdelmalek

Azzi Abdelmalek (view profile)

Answer by bym

bym (view profile)

on 23 Feb 2013

alternative:

c =sym(1:10)
f = @(x) sum(c.*x.^(1:length(c)));

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bym

bym (view profile)

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