Take 1st and 2nd Derivative of Data Points

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Daniel Koziel
Daniel Koziel on 2 Oct 2019
Edited: Rohit Garud on 16 Aug 2020
I am having issues taking the derivative of experimental data. I have a vector (data_out) that is 2000x1 with experimental data inside. I want to take the 1st and 2nd derivative of this data with respect to a time vector (time) that is 2000x1. I've tried using gradient and diff functions in matlab but I have been unsuccessful.
  4 Comments
Alex Mcaulley
Alex Mcaulley on 2 Oct 2019
1stD is not a valid name for a variable. From Matlab documentation:
Valid names begin with an alphabetic character, and can contain letters, numbers, or underscores
Nadir Altinbas
Nadir Altinbas on 24 Oct 2019
Data should be in matrix form and then matrix regular operations apply

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Answers (1)

Rohit Garud
Rohit Garud on 16 Aug 2020
Edited: Rohit Garud on 16 Aug 2020
You can use the gradient() function
data_first_d = gradient(data_out(:)) ./ gradient(t(:))
data_second_d = gradient(data_first_d(:)) ./ gradient(t(:))

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