---
title: columnStarts
framework: accelerate
role: symbol
role_heading: Instance Property
path: accelerate/sparsematrixstructure/columnstarts
---

# columnStarts

The starting index for each column in the row indices array.

## Declaration

```swift
var columnStarts: UnsafeMutablePointer<Int>
```

## Discussion

Discussion This array requires an additional, final entry that defines the final column’s length.

## See Also

### Inspecting the properties of a sparse matrix description

- [attributes](accelerate/sparsematrixstructure/attributes.md)
- [blockSize](accelerate/sparsematrixstructure/blocksize.md)
- [columnCount](accelerate/sparsematrixstructure/columncount.md)
- [rowCount](accelerate/sparsematrixstructure/rowcount.md)
- [rowIndices](accelerate/sparsematrixstructure/rowindices.md)