MATLAB: Trying to use summation notation in a for loop

for loopsummation notation

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);

Best Answer

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)
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