While loop to calculate sine

Question

0 个投票

I have written this code that settles on an incorrect value and I can't see what's wrong. Can anyone show me?

x = pi/4;
analytical = sin(pi/4);
k = 1;
n = 2;
es = .5^(2-n);
et(1) = 1;
sumterms(1) = 0;
while et>=es
      thisterm = (-1)^(k+1)*x^(k*2-1)/factorial(k*2-1);
      sumterms(k+1) = thisterm + sumterms(k);
      et(k+1) = abs(analytical-sumterms(k))/analytical*100;
      k = k+1;
end

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