How to code difference quotients in matlab?

2022 6 13
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更新时间：2022 6 14
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I have a vector U and I want to take its difference quotient at a time instance j i.e. I want to find dU as shown below. How can it be done?
Thank you guys in advance!

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Jonas
Jonas 2022-6-13

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elementwise differences of consecutive elements can be calculated using diff() command

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ekagra gupta
ekagra gupta 2022-6-13
I tried but actually I need ratio of variance of these difference quotients. that is returning NaN values at some points.
Image Analyst
Image Analyst 2022-6-14
Ran in:
Ran in:
U = randi(9, 1, 10)
U = 1×10
2 2 5 8 2 7 8 9 5 1
% Compute difference
du = diff(U)
du = 1×9
0 3 3 -6 5 1 1 -4 -4
% Compute variance
varU = var(du)
varU = 14.1111
Not sure what you mean by ratio. A ratio is a fraction of something divided by something. What are you ratioing? The ratio of a single number -- the variance -- doesn't make sense.

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