simple-squiggle/node_modules/mathjs/docs/reference/functions/setDifference.md

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# Function setDifference
Create the difference of two (multi)sets: every element of set1, that is not the element of set2.
Multi-dimension arrays will be converted to single-dimension arrays before the operation.
## Syntax
```js
math.setDifference(set1, set2)
```
### Parameters
Parameter | Type | Description
--------- | ---- | -----------
`a1` | Array &#124; Matrix | A (multi)set
`a2` | Array &#124; Matrix | A (multi)set
### Returns
Type | Description
---- | -----------
Array &#124; Matrix | The difference of two (multi)sets
### Throws
Type | Description
---- | -----------
## Examples
```js
math.setDifference([1, 2, 3, 4], [3, 4, 5, 6]) // returns [1, 2]
math.setDifference([[1, 2], [3, 4]], [[3, 4], [5, 6]]) // returns [1, 2]
```
## See also
[setUnion](setUnion.md),
[setIntersect](setIntersect.md),
[setSymDifference](setSymDifference.md)