# trace

`import { trace } from "destack:tensor";`

Return the trace of a matrix.

```ds title="trace"
export function trace<T>(matrix: Tensor<T, 2>, options?: TensorOutputOptions<T, 0> | undefined): Tensor<T, 0>
```

[language/library/src/tensor/linalg.ds:55:57](https://github.com/destack-sh/destack/blob/main/language/library/src/tensor/linalg.ds#L55-L57)