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Why can't I get an output when I am trying to find Cosine of 180 radians using Taylor series expansion.

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Suneel Kumar
Suneel Kumar 2016-2-9
关闭： MATLAB Answer Bot 2021-8-20
sum= double(1);
sign=1;
for n=2:2:1000
sign = -sign;
form = ((Rad).^n)/factorial(n);
sum = sum + (sign*(form));
if form <= 0.000000001
break;
end
end
CosFormula = sum
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Torsten
Torsten 2016-2-9
"Rad" is undefined.
Furthermore, you should not build x^n/n! anew in each step because you will arrive at Infinity/Infinity quite soon for Rad>1. Note that form_new = form_old*x^2/((2*n-1)*2*n).
What are you trying to calculate - cos(180) or cos(pi) ? Note that the argument in the Taylor series expansion is in radians, not in degrees.
Best wishes
Torsten.
Guillaume
Guillaume 2016-2-9
Do not use sum or sign as variable names. They both are the names of frequently used matlab functions and having a variable with the same name means you can't use the functions anymore.

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