# Idx

Idx-func

## Description

Evaluates conditional expression involving a single vector and returns a vector of integers containing the row indices of all records that meet the condition.

## Syntax

vector idx(bool vbool)

## Parameters

**vbool**

- a conditional expression on a single vector

## Return

Returns a vector of integers containing the row indices of all records that meet the condition.

## Examples

idx(B==100) // Returns indices of values in B that equal 100
idx(B>=20 && B<=50) // Returns indices of values in B are between 20 and 50
idx(left(A,5)$ == "Chris") // Returns indices of values in A where first 5 letters are "Chris"

## See Also

LabTalk:Xof (function), LabTalk:Xindex1 (function), LabTalk:Xvalue (function), LabTalk:Xindex_(function)