MATLAB: Is N not being displayed

displayfor loop

My problem: I am trying to find the smallest value of N for which error is less than 10^-4. I am just wondering why N is not being displayed at the end of the code.

N=10;
error=1;
while error<10^-4
	N=N+1;
	sum=0;
	for n=1:N
		y=1/n^2;
		sum=sum+y;
	end
	error=((pi^2)/6)-sum;
	disp(N)
end

Best Answer

Because the loop condition is never satisfied and therefore nothing within it is ever executed. I think you meant to have,

while error>10^-4

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MATLAB: For loop nested in while loop problem

I realized that I didn't reinitialize my "a" variable, thanks to Barmar's comment. Although the code might not look very efficient, this is what works for me:

    a = 10;
    k = 0.5;
    n = 2;
    while a < 300
        a = 10;
        for m = 1:5
            a = a + (a*k) + n;
        end
        if a >= 300
            break
        end
        n = n + 1;
    end

MATLAB: One value not being displayed

You've overwritten f(1) when you set f(s2)=0; Replace your first stem line with the values directly:

stem(n_3, 4./(pi*s1).*sin(s1*pi/2), 'p')

Best Answer

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MATLAB: One value not being displayed

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