---
title: MPSMatrixDescriptor
framework: metalperformanceshaders
role: symbol
role_heading: Class
path: metalperformanceshaders/mpsmatrixdescriptor
---

# MPSMatrixDescriptor

A description of attributes used to create an MPS matrix.

## Declaration

```swift
class MPSMatrixDescriptor
```

## Overview

Overview Matrix data is assumed to be stored in row-major order.

## Topics

### Initializers

- [init(rows:columns:matrices:rowBytes:matrixBytes:dataType:)](metalperformanceshaders/mpsmatrixdescriptor/init(rows:columns:matrices:rowbytes:matrixbytes:datatype:).md)
- [init(rows:columns:rowBytes:dataType:)](metalperformanceshaders/mpsmatrixdescriptor/init(rows:columns:rowbytes:datatype:).md)

### Methods

- [init(dimensions:columns:rowBytes:dataType:)](metalperformanceshaders/mpsmatrixdescriptor/init(dimensions:columns:rowbytes:datatype:).md)
- [rowBytes(fromColumns:dataType:)](metalperformanceshaders/mpsmatrixdescriptor/rowbytes(fromcolumns:datatype:).md)
- [rowBytes(forColumns:dataType:)](metalperformanceshaders/mpsmatrixdescriptor/rowbytes(forcolumns:datatype:).md)

### Properties

- [rows](metalperformanceshaders/mpsmatrixdescriptor/rows.md)
- [columns](metalperformanceshaders/mpsmatrixdescriptor/columns.md)
- [dataType](metalperformanceshaders/mpsmatrixdescriptor/datatype.md)
- [MPSDataType](metalperformanceshaders/mpsdatatype.md)
- [rowBytes](metalperformanceshaders/mpsmatrixdescriptor/rowbytes.md)
- [matrices](metalperformanceshaders/mpsmatrixdescriptor/matrices.md)
- [matrixBytes](metalperformanceshaders/mpsmatrixdescriptor/matrixbytes.md)

## Relationships

### Inherits From

- [NSObject](objectivec/nsobject-swift.class.md)

### Conforms To

- [CVarArg](swift/cvararg.md)
- [CustomDebugStringConvertible](swift/customdebugstringconvertible.md)
- [CustomStringConvertible](swift/customstringconvertible.md)
- [Equatable](swift/equatable.md)
- [Hashable](swift/hashable.md)
- [NSObjectProtocol](objectivec/nsobjectprotocol.md)

## See Also

### Matrices

- [MPSMatrix](metalperformanceshaders/mpsmatrix.md)
- [MPSTemporaryMatrix](metalperformanceshaders/mpstemporarymatrix.md)