How can I find the difference between adjacent elements while ignoring the first value?

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Benjamin Horsley 2021-2-15

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https://ww2.mathworks.cn/matlabcentral/answers/745592-how-can-i-find-the-difference-between-adjacent-elements-while-ignoring-the-first-value

评论： Benjamin Horsley 2021-2-15

采纳的回答： Stephen23

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I have the following column vector.

data = randperm(100,15)';

Is there a way of using the "diff" function to find the difference between adjacent elements while ignoring the first one? In other words, I would like the calculation to start with elements 2 and 3 then 4 and 5 etc.

Appreciate the help! Thanks.

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Stephen23 2021-2-15

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diff(data(2:end))

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Stephen23 2021-2-15

编辑：Stephen23 2021-2-15

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Where vec is your vector of 14 elements:

out = vec(2:2:end)-vec(1:2:end)

Benjamin Horsley 2021-2-15

Terrific! Thanks, @Stephen Cobeldick!

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