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Homework Help: Maclaurin Series cos x (MATLAB) can somebody find my error

  1. Apr 30, 2010 #1
    Maclaurin Series cos x (MATLAB)... can somebody plz find my error

    a. Consider the MacLauren series for cos x.
    Find TN(x) for N = 2, 4, 6, 8. For each of these, graph cos(x) and TN(x) on the same plot for x (-pi/4,pi/4)




    y=cos(x);
    T2=zeros(1,length(x));
    for i=1:length(x)
    T2(i)=sum(bn(i,1:3));
    end
    plot(x,y,x,T2)
    title('T2 vs cos x')
    >> x=(-pi/4):(pi/400):(pi/4);
    bn=zeros(length(x),10);
    for i=1:10
    for j=1:length(x)
    n=i-1;
    bn(j,i)=((-1)^n*x(j)^(2*n))/(factorial(2*n));
    end
    end

    y=cos(x);
    T2=zeros(1,length(x));
    for i=1:length(x)
    T2(i)=sum(bn(j,1:3));
    end
    plot(x,y,x,T2)
    title('T2 vs cos x')
     
  2. jcsd
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