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

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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

Walter Roberson on 1 Apr 2018

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?

2 Answers

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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)

4 Comments

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Birdman on 1 Apr 2018

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.

Roger Stafford on 1 Apr 2018

@Birdman: I think you meant f(pi/2)

Birdman on 1 Apr 2018

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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