Trying to use summation notation in a for loop

Hi I'm trying to estimate a cos graph using summation between 1:1, 1:2, 1:3, 1:4 and 1:5. How would I plot each of these individually?

Could someone help me out please! Thank you

    x = -pi:0.1:pi;
ye = cos (x);
n = 5;
summe = 0.0;
for i = 1:n
    summe = summe +((-1).^(i)).*((x.^(2.*i))./(factorial(2.*i)));
end 

    plot (x, summe);

Answer 1

[Birdman]

Firstly, this code will give an error since X vector is 1x63 and n is 1x5. There will be a size mismatch. You have to correct this. Use the following code.

x = -pi:0.1:pi;
ye = cos (x);
n = length(x);%has to be same size with x
i = 1:n;
for k = 1:n
  summe = summe +((-1).^(i)).*((x.^(2.*i))./(factorial(2.*i)));
end
plot(x,summe)

[James Crowe]

It's for some coursework I've been told to use a for loop

[Birdman]

I have corrected it.

Answer 2

[KSSV]

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