# How to make a QuickSort for 2 vectors?

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Thomas Nell on 12 Dec 2018
Commented: James Tursa on 13 Dec 2018
Hey guys,
I have 2 vectors here, time [23 4 8 9 21 3 11 15 17 2] and signal [12 14 11 13 16 5 31 21 9 3]. What I want do is quicksort time into ascending order (i.e time =2 3 4 8 9 11 15 17 21 23] ). However, I also want the signal to rearrange itself accordingly, so it becomes [3 5 14 11 13 31 21 9 16 12]. How would I go about this???
Kind regards,
Tom
P.S I'm not allowed to use the sort command
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### Answers (1)

James Tursa on 12 Dec 2018
Edited: James Tursa on 12 Dec 2018
See the 2nd output of the sort( ) function, and use that as an index to rearrange your signal. E.g.,
[t,x] = sort(time);
s = signal(x);
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James Tursa on 13 Dec 2018
What have you done so far? Are you having trouble getting started? Are you getting errors in your code? Do you have a working quicksort routine and just need to figure out how to get the indexes? Or ...?

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