Plotting summation using for loop

Question

James Crowe 2017-10-26

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/363385-plotting-summation-using-for-loop

编辑： James Crowe 2017-10-26

How would I plot values of i for 1,2,3,4,5 individually on the same graph?

 x = -pi:0.1:pi;
ye = cos(x);
n = length(x);
summe = 0.0;
for i = 1:n
    summe = summe +((-1).^(i)).*((x.^(2.*i))./(factorial(2.*i)));
end
hold on
plot (x, summe);
plot (cos(x), ye)

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James Crowe 2017-10-26

Also the cos graph plots between 0 and around 63? How do I sort this?

Birdman 2017-10-26

Check my answer.

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Answer 1

Birdman 2017-10-26

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/363385-plotting-summation-using-for-loop#answer_287874

在 MATLAB Online 中打开

In previous question, as I told you, if you want your n vector as n=1:5, then you have to set your x vector as

x=-pi:pi/2:pi

and

n=1:length(x)

but it will be not wise to do this since when you plot, the figure will be a triangular shape. Therefore, you have to sample as many points as you can,

x = -pi:0.1:pi

is a wise choice.

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Birdman 2017-10-26

在 MATLAB Online 中打开

x = -pi:pi/2:pi;
xx= -pi:0.1:pi;
ye = cos(xx);
n = length(x);
i=1:n;
summe=0;
for i = 1:n
    summe = summe + ((-1).^i).*((x.^(2*i))./(factorial(2.*i)));
end
plot (x, summe);
hold on;grid on
plot(xx,ye)