Comand window answer is wrong while the values in variable are ok. the x values in comand window is repeated and not in sequence

clear; clc;
xmin=-0.9;dx=.1;
fprintf('x       ex\n')
fprintf('===============\n')
for i=1:19
    
    x(i)=xmin+(i-1)*dx;
    
   ex1(i)=(1+x(i)^2)^-0.5;
    
    term=1;
    for n=1:50    
    term(n+1)=-term(n)*(x(i)^2)*(2*n-1)/(2*n);
    if abs(term(n+1))<=term(n)*1e-06
        break;
        
    end
    end
    ex(i)=sum(term);
    fprintf(' %.2f        %.6f    %.6f \n',x,ex,ex1)
end

Answer 1

[Rik]

You are printing the full arrays in your fprintf statement. You also forgot to pre-allocate your arrays, and you forgot to write comments.

clear; clc;
xmin=-0.9;dx=.1;
fprintf('x       ex\n')
fprintf('===============\n')
x=zeros(1,19);
ex=zeros(1,19);
ex1=zeros(1,19);
for i=1:19
    x(i)=xmin+(i-1)*dx;
    ex1(i)=(1+x(i)^2)^-0.5;
    
    term=zeros(1,50);term(1)=1;
    for n=1:50
        term(n+1)=-term(n)*(x(i)^2)*(2*n-1)/(2*n);
        if abs(term(n+1))<=term(n)*1e-06
            break;
        end
    end
    ex(i)=sum(term);
    fprintf(' %.2f        %.6f    %.6f \n',x(i),ex(i),ex1(i))
end