---
title: "ClikaRT::ops::rsqrt"
sidebar_label: "rsqrt"
description: "Elementwise reciprocal square root. \\[ 1 / \\sqrt{x_i} \\] Negative inputs produce NaN; zero produces +inf. Value-domain violations follow IEEE semantics (NaN / ±inf in the result), never an error."
---

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<span class="api-kind api-kind--function">function</span>

## rsqrt() {#rsqrt}

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[`Tensor`](../Tensor.md) **`rsqrt`**([`Tensor`](../Tensor.md) `input`)

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Elementwise reciprocal square root.

$$
1 / \sqrt{x_i}
$$

Negative inputs produce NaN; zero produces +inf. Value-domain violations follow IEEE semantics (NaN / ±inf in the result), never an error.

**Throws**

- `ClikaRT::Error`: when the input's dtype is not served for this operation (the machine-readable reason rides `code_name()`).

**Returns:** a new tensor, same shape and dtype as `input`.

```cpp
auto y = ClikaRT::ops::rsqrt(x);
```

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Declared in `ClikaRT/compute/ops.h`, line 5276

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