# subarray

Creates a multi-line array of subscripts or limits, typically placed under operators like sum or prod

https://texform.dev/latex/environments/subarray

## Metadata

| Field | Value |
| --- | --- |
| Topic | [Matrices](https://texform.dev/latex/topics/matrices) |
| Packages | ams |
| Allowed mode | math |
| Tags | math-alignment, nestable |
| Commonality | medium |
| Body mode | math |

## Syntax

### ams

Argument specification: `m:C`

Creates a multi-line array of subscripts or limits, typically placed under operators like sum or prod

## Examples

```latex
\begin{subarray}{c} i > 0 \\ j < 5 \end{subarray}
```

[Open in Playground](https://play.texform.dev/?input=%5Cbegin%7Bsubarray%7D%7Bc%7D+i+%3E+0+%5C%5C+j+%3C+5+%5Cend%7Bsubarray%7D)

```latex
\sum_{\begin{subarray}{l} i \in I \\ j \in J \end{subarray}} x_{ij}
```

[Open in Playground](https://play.texform.dev/?input=%5Csum_%7B%5Cbegin%7Bsubarray%7D%7Bl%7D+i+%5Cin+I+%5C%5C+j+%5Cin+J+%5Cend%7Bsubarray%7D%7D+x_%7Bij%7D)

## Renderer support

| Package | MathJax | KaTeX | XeTeX |
| --- | --- | --- | --- |
| ams | full | full | full |

## Usage frequency

0.02% of formulas in the measured corpus contain this entry, rank 25 of 31 entries with frequency data.

## In TeXForm

TeXForm reads the environment body in math mode.

## See also

- [bmatrix](https://texform.dev/latex/environments/bmatrix)
- [Bmatrix](https://texform.dev/latex/environments/Bmatrix)
- [cases](https://texform.dev/latex/environments/cases)
- [matrix](https://texform.dev/latex/environments/matrix)
- [pmatrix](https://texform.dev/latex/environments/pmatrix)
- [smallmatrix](https://texform.dev/latex/environments/smallmatrix)
- [vmatrix](https://texform.dev/latex/environments/vmatrix)
- [Vmatrix](https://texform.dev/latex/environments/Vmatrix)

## Test cases

### ams

| Input | Case | MathJax | KaTeX | XeTeX |
| --- | --- | --- | --- | --- |
| \sum_{\begin{subarray}{l} i \in A \\ j \in B \end{subarray}} | Positive: ctx:in-subscript | Pass | Pass | Pass |