# Answer to Question #8120 in Other Programming & Computer Science for kenry

Question #8120
Expert... help me on this problem, i already try many times during this 2 week, but i cant the answer by using m-files. Determine the real root of f(x)=-26+85x-91x^2+44x^3-8x^4+x^5 Using bisection to determine the root to &epsilon;s=10 %. Employ initial guesses of xl=0.5 and xu=1.0. You need to solve the above problem using Matlab
function
[c,err,yc]=bisection(f,a,b,err_tolerance)
ya=feval(f,a);
yb=feval(f,b);
if
ya*yb >
0,return,end
maxx=1+round((log(b-a)-log(err_tolerance))/log(2));
for
k=1:maxx
c=(a+b)/2;
yc=feval(f,c);
if yc==0
a=c;
b=c;
elseif
yb*yc>0
b=c;
yb=yc;
else
a=c;
ya=yc;
end
if b-a <
err_tolerance, break,end
end
c=(a+b)/2;
err=abs(b-a);
yc=feval(f,c);

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kenry
06.04.12, 07:11

but y it appear those error comment?
??? Error: File: Untitled.m Line: 6 Column: 1
Function definitions are not permitted in this context.... tis error come out by the "function" word...