---
name: "SDL_logf"
section: "3"
platform: "linux"
package: "libsdl3-doc"
version: "3.2.10+ds-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/SDL_logf"
---

# SDL\_logf(3)

Compute the natural logarithm of x .

## NAME

SDL\_logf - Compute the natural logarithm of **x** .

## HEADER FILE

Defined in SDL3/SDL\_stdinc.h

## SYNOPSIS

```
#include "SDL3/SDL.h"
```

**float SDL\_logf(float x);**

## DESCRIPTION

Domain: **0**\<**x**\<=**INF** Range: **-INF**\<=**y**\<=**INF** It is an error for **x** to be less than or equal to 0.

This function operates on single-precision floating point values, use

**SDL\_log**\
  for double-precision floats.

This function may use a different approximation across different versions, platforms and configurations. i.e, it can return a different value given the same input on different machines or operating systems, or if SDL is updated.

## FUNCTION PARAMETERS

- *x*

  floating point value. Must be greater than 0.

## RETURN VALUE

Returns the natural logarithm of **x** .

## THREAD SAFETY

It is safe to call this function from any thread.

## AVAILABILITY

This function is available since SDL 3.2.0.

## SEE ALSO

**•**(3), [**SDL\_log**(3)](/SDL_log/3.md), **•**(3), [**SDL\_expf**(3)](/SDL_expf/3.md)