# Question in passing elements of 2 same-length lists by 'each' keyword
**URL:** https://forum.kx.com/t/question-in-passing-elements-of-2-same-length-lists-by-each-keyword/13953
**Category:** Community Support
**Tags:** kdb-and-q, imported
**Created:** [June 12, 2024, 4:58am UTC](https://forum.kx.com/t/question-in-passing-elements-of-2-same-length-lists-by-each-keyword/13953 "2024-06-12T04:58:05Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@jackyyuk](https://forum.kx.com/u/jackyyuk)
#### Post date: [June 12, 2024, 4:58am UTC](https://forum.kx.com/t/question-in-passing-elements-of-2-same-length-lists-by-each-keyword/13953/1 "2024-06-12T04:58:05Z")
[https://learninghub.kx.com/forums/topic/question-in-passing-elements-of-2-same-length-lists-by-each-keyword](https://learninghub.kx.com/forums/topic/question-in-passing-elements-of-2-same-length-lists-by-each-keyword)
Hello all,
Is it possible to pass elements of 2 same-length lists by 'each' keyword in the same time? In my case, list 1 is a nested list of lists, and list 2 contains index of the element on each row in list 1, so I would like to do something like:
{[e1;e2] e1[e2] : new values } [;] each list1,list2
Is there any simple way to do so?
Thanks very mush.
Jacky
---
### Author:  [@rocuinneagain](https://forum.kx.com/u/rocuinneagain)
#### Post date: [June 12, 2024, 8:32am UTC](https://forum.kx.com/t/question-in-passing-elements-of-2-same-length-lists-by-each-keyword/13953/2 "2024-06-12T08:32:18Z")
**'** form of **each** https://code.kx.com/q/ref/maps/#each
```
q){x[y]:99;x}'[(1 2 3;4 5 6;7 8 9);0 1 2]
99 2 3
4 99 6
7 8 99
```
Amend at **@** version https://code.kx.com/q/ref/apply/#amend-amend-at
```
q){@[x;y;:;99]}'[(1 2 3;4 5 6;7 8 9);0 1 2]
99 2 3
4 99 6
7 8 99
```
```
q)@[;;:;99]'[(1 2 3;4 5 6;7 8 9);0 1 2]
99 2 3
4 99 6
7 8 99
```