Sigma sum error (Unrecognized variable n)

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Taekyung
Taekyung 2022-10-16
编辑： Taekyung 2022-12-11
I'm trying to plot this complicated graph using matlab.
  1 个评论
Ghazwan
Ghazwan 2022-10-16
Well, you need to define n in the functions. You can do a for loop then you may have the summation.

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回答（1 个）

KSSV
KSSV 2022-10-16
Something like this:
clear ; clc ;
thesum = 0 ;
for n = 1:10
a = @(x) ((-0.07305.*x.^5+2.813.*x.^4-39.78.*x.^3+249.5.*x.^2-640.5.*x+1073).*cos(n*pi.*x/6)./6);
b = @(x) ((-0.07305.*x.^5+2.813.*x.^4-39.78.*x.^3+249.5.*x.^2-640.5.*x+1073).*sin(n*pi.*x/6)./6);
c = integral(a,-6,6) ;
d = integral(b,-6,6) ;
% e = c.*cos(n*pi.*x./6)+d.*sin(n*pi.*x./6)
thesum = thesum+c+d ;% +4796.1296
end

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