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bisection method error while checking loop with f(p)

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PJS KUMAR
PJS KUMAR 2018-8-3
function p = bisection(f,a,b)
if f(a)*f(b)>0
disp('Wrong choice bro')
else
p = (a + b)/2;
err = abs(f(p));
while err > 1e-7
if f(a)*f(p)<0
b = p;
else
a = p;
end
p = (a + b)/2;
err = abs(f(p));
end
end
The above Bisection method is not working with f(x)=x*tan(x)+1 using the interval [1,2].
>> f=@(x)x*tan(x)+1;
>> bisection(f,1,2)
not giving any output and entering into infinite loop

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