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# Find index of value in array

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Hugo on 22 Feb 2021
Commented: Star Strider on 23 Feb 2021
Hello everyone!
I have two vectors: vect_number_subjects, each position is the number of subjects in a specific folder, and vect_TR, which is the respetive Repetition Time (TR) for those subjects in each folder. The variable number_subjects is the total of subjects present in the folder to be analyzed.
number_subjects = length(dirFicheiroMat);
vect_number_subjects = [15 23 24 33 36 36 37 39 41 44 48 59 61 75 113 169];
vect_TR = [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 perform a for loop that allows me to calculate the sampling frequency (1/TR) automaticaly, based on the number of subjects present in the folder to be analyzed in that particular moment.
I appreciate any ideas to solve this problem.
Thanks in advance
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### Accepted Answer

Star Strider on 22 Feb 2021
It is not obvious to me how the number of subjects and the repitition time interact, however it is unlikely that a loop is necessary in any event.
See if this does what you want:
vect_number_subjects = [15 23 24 33 36 36 37 39 41 44 48 59 61 75 113 169];
vect_TR = [2.2 2.5 1.5 2 1.5 2 2 2.5 3 2 2 1.6 2 3 2 2];
Fs = vect_number_subjects ./ vect_TR;
.
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Star Strider on 23 Feb 2021
As always, my pleasure!

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