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Infintite Loop- bisection search how to stop

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Michael Kurniawan
Michael Kurniawan 2012-10-4
function rootx = bisectionSearch (fhandle,a,b,epsilon)
while (b-a) > epsilon %assume a<b
m =(b+a)/2
fhandlem=fhandle(m);
if fhandlem == 0
rootx = m %If f(m) is equal to zero then return the root as m
else if sign (fhandle(m))== sign (fhandle(a)) %
a=m; % If f(m) has the same sign as f(a) Replace a with m
else
m=b;
end
end
end
m;
end
Hi guys this is an infinte loop and I do not know why or how to fix it Please help if possible. when I test it it keeps giving me m values repeatly of 1.75 and I dont think thats even the right answer. please Help!
  2 个评论
Matt J
Matt J 2012-10-4
It gives you m=1.75 repeatedly with what input arguments?
Michael Kurniawan
Michael Kurniawan 2012-10-4
[x]=bisectionSearch(f,1,2,0.01) f= @(x)sin(x)-log(x+1)

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采纳的回答

Matt J
Matt J 2012-10-4
编辑：Matt J 2012-10-4
In the case fhandlem==0, you should BREAK to terminate the loop. Also, you need b=m instead of m=b.
Finally, you could use an ELSEIF structure instead of ELSE...IF.
  7 个评论
显示 5更早的评论
Matt J
Matt J 2012-10-4
Move rootx=m to the last line of the function.

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