Apply function on array

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x x
x x 2019-9-20
回答： Star Strider 2019-9-20
I would like to create function which will take number from the second position in array, add numbers from the first and third position in that array and write down as a second position in the output array. So the formla would be F2=A1+A2+A3 if A is our input array and F is output. It should work for unknow lenght of array and take 0 for first and last number (so for F1= 0+A1+A2). I would be very thankful for any advice how I should do it...

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回答（2 个）

madhan ravi
madhan ravi 2019-9-20
Probably you're looking for cumsum()
doc cumsum
Star Strider
Star Strider 2019-9-20
Try this:
A = randi(9, 10, 1) % Create ‘A’
F = zeros(size(A)); % Preallocate ‘F’
F1 = filter([1 1 1], 1, A); % All Releases
F2 = movsum(A, [1 1]); % In R2016a & Later
F(2:end-1) = F1(3:end) % Desired Output
F(2:end-1) = F2(2:end-1) % Desired Output
Experiment to get the result you want

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