How to assign value to a variable depending on another array?

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Hi everyone!
My code allows the user to choose between 16 folders, with each folder having this amount of files [15 23 24 33 36 36 37 39 41 44 48 59 61 75 113 169], noting that there are 2 folders with the same number of files. Since I'm dealing with fMRI time-series points, each folder will have a specific repetition time (TR), which will be [2.2 2.5 1.5 2 1.5 2 2 2.5 3 2 2 1.6 2 3 2 2].
I want to, after choosing the folder, calculate the sampling frequency (fs=1/TR) for that selected folder. How can I get the TR, based on the number of files for any eventually selected folder?
Thanks in advance!
Iugo on 1 Mar 2021
Thank you both for your replies!!
I will do what Walter mentioned, create a TR.mat for each folder to store those values that I need for posterior calculations.

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