MATLAB: Loop to count amount sin(x)>0.5 when 1>x>1000

Question

What is wrong?

for n=1:1000  
while n<1000
    if sin(n)>0.5
        s(n)=sin(n);
        n=n+1;
    else
        n=n+1;
    end
end
end
L=length(s);
disp(L)

Answer 1

To get what you want loop is not required.

x = linspace(1,1000,10^5) ;
y = sin(x) ;
nnz(y>0.5)

If you want loop:

% loop 
thesum = 0 ;
for i = 1:length(x)
  y = sin(x(i)) ;
  if y > 0.5 
    thesum = thesum+1 ;
    end
end
thesum