Do I need to change to floating pts?

%Subscript indices must either be real positive integers or logicals. Error in linearinterp (line 5) plot(x, y, points, y(points), 'r+');%

function linearinterp

x=linspace(-5, 2*pi, 30);

y=exp(-x./2).*sin(x.^2+8);

points = refine(0, 7, 0.6);

plot(x, y, points, y(points), 'r+');

hold on

plot(points, y(points));

hold off

end

function points = refine(x1, x2, tol)

xm = (7)/2;

if abs((0.98935824662+0.01317103434)/2-0.171258585)<tol

points=[x1,x2];

else

left=refine(x1, xm, tol);

right=refine(xm, x2, tol);

points=[left, right(2:length(right))];

end

end

Answer 1

[Image Analyst]

In y(points) points must be an index 1,2,3,4,5,6,etc. or a logical vector [true, false, false, true, etc.}. It's probably not for you. What is the value of points?