Avoiding for-loops with subsequent elements in arrays

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Sim
Sim 2020-6-9
评论： Sim 2020-6-9
Hi, given this
x = [0 10 20 30];
y = [20 10 10 15];
could you suggest a more compact (and faster) way to perform this operation?
A(1) = (y(1) - y(2)) / (x(2) - x(1));
for i = 2 : 4
A(i) = (y(i-1) - y(i)) / (x(i) - x(i-1));
end
Thanks to everyone!

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madhan ravi
madhan ravi 2020-6-9
编辑：madhan ravi 2020-6-9
-[0, diff(y) ./ diff(x)]
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madhan ravi
madhan ravi 2020-6-9
eh... well looks like you edited your question after I answered. Before since you didn’t preallocate A MATLAB fills the “first” element with “zero” so...

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