# arg_sort()

Returns a list of indices that would sort a given list.

## Synopsis

arg_sort(list-expression)


## Description

This function determines how to sort the given list, and then returns the list of indices that should be used to sort the list. Note that list indices in FRED are 0-based, in that $$0$$ refers to the first item in the list.

## Parameters

list-expression

An expression that evaluates to a list.

## Returns

A list of indices that would sort the the given list.

## Examples

The following example returns the list [3, 2, 0, 1], corresponding to the indices to use when sorting the list [8, 9, 10, 11].

arg_sort([10,11,9,8])