MATLAB: Array Indice Error For Loop

forfor loop

Following code is coming up with error "Array indices must be positive integers or logical values."
Does someone know what is causing this. Trying to store each value into an array
z =@(x) tan(x);
h = 0.5
for x=1:0.5:10
  Output (x) = (z(x+h)-z(x-h))/(2*h);
end
Array = [Output]

Best Answer

z =@(x) tan(x);
h = 0.5
x=1:0.5:10
Output = zeros(1,19) %preallocation for speed and efficiency
for i = 1:numel(x)
  Output (i) = (z(x(i)+h)-z(x(i)-h))/(2*h);
end
Array = Output
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