sortIndices function

Syntax

float[] sortIndices(array)

Parameters

Description

The sortIndices function returns the indices of sorted values in array.

array = 
["c","b","d","a"]
sortIndices(array)
[3,1,0,2]
array[sortIndices(array)]
["a","b","c","d"]

Duplicate values are sorted in the order of appearance.

array = 
[2,1,3,3,1]
sortIndices(array)
[1,4,0,2,3]
array[sortIndices(array)]
[1,1,2,3,3]

Each row is sorted separately. The returned index array has the same dimensions as array.

array = 
["e","c","d";
 "b","a","c";
 "d","a","d"]
sortIndices(array)
[1,2,0;
 4,3,5;
 7,6,8]
array[sortIndices(array)]
["c","d","e";
 "a","b","c";
 "a","d","d"]

Related

Examples

Ascending and descending sorting

reverse(array) = array[size(array)-1:-1:0]

sortAsc(array) = array[sortIndices(array)]
sortDesc(array) = reverse(sortAsc(array))

const a = ["a", "c", "b"]
const b = sortAsc(a)       // [a,b,c]
const c = sortDesc(a)      // [c,b,a]

An array is indexed with sorted indexes which sorts all values in ascending order. The resulting array can be reversed for a descending sort order. Note that this example only applies to 1d arrays with 1 row.

Finding minimum and maximum

findMin(array) = sortIndices(array)[0]
findMax(array) = sortIndices(array)[size(array)-1]

min(array) = array[findMin(array)]
max(array) = array[findMax(array)]

const a = [1, 4, -1, 9]
const b = min(a)           // -1
const c = max(a)           // 9

The index of the minimum value in array is the first element in the sorted indexes array. Note that this example only applies to 1d arrays with 1 row. 2d arrays must be "flattened" first, i.e. reshaped to an array with one row:

flatten(array) = array[0:size(array)-1]

findMin(array) = sortIndices(flatten(array))[0]
findMax(array) = sortIndices(flatten(array))[size(array)-1]

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