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is there a problem with my operators???
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EDU>> refine(0, 7, .1) Undefined function 'f' for input arguments of type 'double'.
Error in refine (line 3)
if abs((f(x1)+f(x2))/2-f(xm))<tol
function points=refine(x1, x2, tol)
xm = (x1+x2)/2;
if abs((f(x1)+f(x2))/2-f(xm))<tol
points=[x1,x2];
else
left=refine(x1, xm, tol);
right=refine(xm, x2, tol);
points=[left, right(2:length(right))];
end
end
function linearinterp
x=linspace(-5, 2*pi, 30);
y=exp.^(-x./2).*sin(x^.2+8);
points=refine(0, 7, 0.1);
plot(x, y, points, f(points), 'r+');
hold on
plot(points, f(points));
hold off
end
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