Sorting corresponding index if the position sorted in descend order?

Hi all,

I have one dimensional particle aarray say P and the corresponding index I. Later, I have sorted the position data in descending order using descend comand like P_N. Now I want to done the change of the corresponding index effeciently(Since my original array is too large,thats whyI am not interested to use loop) as I_N. Thanks.

[Stephen23]

@Rubel Ahmed: take a look at SORT's second output argument:

https://www.mathworks.com/help/matlab/ref/sort.html

[Rubel Ahmed]

@Stephen thanks mate.Its done!