How to code difference quotients in matlab?

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ekagra gupta 2022-6-13

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评论： Image Analyst 2022-6-14

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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Answer 1

Jonas 2022-6-13

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https://ww2.mathworks.cn/matlabcentral/answers/1739655-how-to-code-difference-quotients-in-matlab#answer_984975

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

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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 2022-6-14

在 MATLAB Online 中打开

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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