How to sort in matlab using a custom comparator function

Question

I am writing a program to find max possible number that can be formed from a vector of numbers in string format.

Like A = ["3" "30" "33"] should give "33330". However a normal sort using sort(A,'descend') returns "33303"

Is there any way to use a comparator function in matlab to use as key while doing sort(A) ?

Something along the lines of sort(A,key=compare_function) where my compare function would compare two strings and return which is bigger as per the above logic (for example on inputs "30" and "3" it will form two strings "303" and "330", and return that "330" is bigger as per the logic)

So do you want to sort the elements of A, or return the permutation that maximizes the concatenated number? — Luis Mendo
– Luis Mendo, Commented Jan 12, 2022 at 23:02
@LuisMendo for higher size of A , sorting in this custom way will give the required permutation — Abhishek Agarwal
– Abhishek Agarwal, Commented Jan 17, 2022 at 17:40

James Tursa · Accepted Answer · 2022-01-12 18:17:38Z

0

Maybe you can modify this quicksort from the File Exchange to use your own custom compare function:

https://www.mathworks.com/matlabcentral/fileexchange/66704-quicksort?s_tid=srchtitle_quicksort_1

answered Jan 12, 2022 at 18:17

James Tursa

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