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# MPSMatrix

A 2D array of data that stores the data’s values.

```
class MPSMatrix
```

## Overview

[`MPSMatrix`](/documentation/MetalPerformanceShaders/MPSMatrix) objects serve as inputs and outputs of [`MPSMatrixMultiplication`](/documentation/MetalPerformanceShaders/MPSMatrixMultiplication) objects. Matrix data is assumed to be stored in row-major order.

> Note:
> An ``doc://com.apple.metalperformanceshaders/documentation/MetalPerformanceShaders/MPSMatrix`` object maintains its internal storage using a <doc://com.apple.documentation/documentation/Metal/MTLBuffer> object. Thus, the same rules for maintaining coherency of the buffer’s data between CPU memory and GPU memory also apply to an ``doc://com.apple.metalperformanceshaders/documentation/MetalPerformanceShaders/MPSMatrix`` object.

## Topics

### Methods

[`init(buffer:descriptor:)`](/documentation/MetalPerformanceShaders/MPSMatrix/init(buffer:descriptor:))

Initializes a matrix with a buffer.

### Properties

[`device`](/documentation/MetalPerformanceShaders/MPSMatrix/device)

The device on which the matrix will be used.

[`rows`](/documentation/MetalPerformanceShaders/MPSMatrix/rows)

The number of rows in the matrix.

[`columns`](/documentation/MetalPerformanceShaders/MPSMatrix/columns)

The number of columns in the matrix.

[`dataType`](/documentation/MetalPerformanceShaders/MPSMatrix/dataType)

The type of the values in the matrix.

[`rowBytes`](/documentation/MetalPerformanceShaders/MPSMatrix/rowBytes)

The stride, in bytes, between corresponding elements of consecutive rows in the matrix.

[`data`](/documentation/MetalPerformanceShaders/MPSMatrix/data)

The buffer that stores the matrix data.

[`matrices`](/documentation/MetalPerformanceShaders/MPSMatrix/matrices)

[`matrixBytes`](/documentation/MetalPerformanceShaders/MPSMatrix/matrixBytes)


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