Undefined function or variable 'x'. Why is there an error?

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Ehi Eromosele
Ehi Eromosele 2014-2-12
回答： Walter Roberson 2014-2-12
%Undefined function or variable 'x'.
Error in linearinterp (line 2)
f=(exp(-x/2).*sin(x.^2+8));%
function linearinterp
%Error
f=(exp(-x/2).*sin(x.^2+8));
points = refine(0, 7, 0.6);
plot(points, f(points), 'r+');
hold on
plot(points, f(points));
hold off
end
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

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采纳的回答

Walter Roberson
Walter Roberson 2014-2-12
f = @(x) (exp(-x/2).*sin(x.^2+8));

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