MATLAB: Is there an error? Unbalanced or unexpected parenthesis or bracket.

Question

Error: File: golden.m Line: 1 Column: 21

Unbalanced or unexpected parenthesis or bracket.

function golden(sqrt(2), sqrt(28))

t=[sqrt(2):0.01:sqrt(28)];

plot(t, arrayfun(@f,t));

hold on

tol=10^(-12);

r=(3-sqrt(5))/2;

c=sqrt(2)+r*(sqrt(28)-sqrt(2));

d=sqrt(28)-r*(sqrt(28)-sqrt(2));

fa=f(sqrt(2));

fb=f(sqrt(28));

fc=f(c);

fd=f(d);

while (sqrt(28)-sqrt(2)>tol)

    if (fc<fd)
        sqrt(28)=d;
        fb=fd;
        d=c;
        fd=fc;
        c=sqrt(2)+r*(sqrt(28)-sqrt(2));
        fc=f(c);
        plot(c,fc,'r*');
    else
        sqrt(2)=c;
        fa=fc;
        c=d;
        fc=fd;
        d=sqrt(28)-r*(sqrt(28)-sqrt(2));
        fd=f(d);
        plot(d,fd,'r*');
    end

end

fprintf('Minimum found at x=%.12f \n', (sqrt(2)+sqrt(28))/2, f(sqrt(2)+sqrt(28))/2);

hold off

end

Answer 1

sqrt(2) and sort(28) are not a valid variable name

replace sqrt(2) and sqrt(28) every with A and B

function golden (A,B)
t = A:0.01:B ;
.. etc ..