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# invert()

Replaces the receiver’s matrix with its inverse matrix.

```
func invert()
```

## Discussion

Inverse matrices are useful for undoing the effects of a matrix. If a previous point (x,y) was transformed to (x’,y’), inverting the matrix and applying it to point (x’,y’) yields the point (x,y).

You can also use inverse matrices in conjunction with the [`concat()`](/documentation/Foundation/NSAffineTransform/concat()) method to remove the effects of concatenating the matrix to the current transformation matrix of the current graphic context.

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