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Please help me convert equation to matlab code.

Asked by adi putra on 1 Apr 2018
Latest activity Commented on by Walter Roberson
on 1 Apr 2018
Deal all.
I need you help to convert this equation to matlab code
I spend a lot of time to write it but it doesn't work. Thank you.

  1 Comment

Are you permitted to use the symbolic toolbox?
Is the question about providing some kind of symbolic proof, or is it about calculation of the formula using finite precision and a particular numeric input?

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2 Answers

Answer by Birdman
on 1 Apr 2018
Edited by Birdman
on 1 Apr 2018

Basically, Symbolic Toolbox will help you:
syms y(x) n
f(x)=symsum((-1).^n*(x.^(2*n+1))/factorial(2*n+1),n,0,Inf)

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Show 1 older comment
Now that you have f(x)=sin(x), simply write
f(90)
but remember that sin function takes input arguments in radians, you need to write
f(pi/2)
to get a numerical result.
@Birdman: I think you meant f(pi/2)
Yes, I just now edited it Roger.

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Answer by Roger Stafford on 1 Apr 2018

N = 100; % <-- Choose some large number
s = x;
for n = 2*N-1:-2:1
s = x - s*x^2/((n+2)*(n+1));
end
(I think you meant to take the limit as N approaches infinity, not x.)

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