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ElementsAt function

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Warning

This documentation refers to the Classic QDK, which has been replaced by the Modern QDK.

Please see https://aka.ms/qdk.api for the API documentation for the Modern QDK.

Namespace: Microsoft.Quantum.Arrays

Package: Microsoft.Quantum.Standard

Returns the array's elements at a given range of indices.

function ElementsAt<'T> (range : Range, array : 'T[]) : 'T[]

Input

range : Range

Range of array indexes

array : 'T[]

Array

Output : 'T[]

Type Parameters

'T

The type of each element of array.

Example

Get the odd indexes in famous integer sequences. (note that the 0 index corresponds to the first value of the sequence.)

let lucas = [2, 1, 3, 4, 7, 11, 18, 29, 47, 76];
let prime = [2, 3, 5, 7, 11, 13, 17, 19, 23, 29];
let fibonacci = [0, 1, 1, 2, 3, 5, 8, 13, 21, 34];
let catalan = [1, 1, 2, 5, 14, 42, 132, 429, 1430, 4862];
let famousOdd = Mapped(ElementsAt<Int>(0..2..9, _), [lucas, prime, fibonacci, catalan]);
// same as: famousOdd = [[2, 3, 7, 18, 47], [2, 5, 11, 17, 23], [0, 1, 3, 8, 21], [1, 2, 14, 132, 1430]]

See Also