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[//]: # (generated using SlashBack 0.2.0)
# compatibility methods
The following methods are all part of the **compatibility methods**\.
Provide functions to increase the compatibility with Cg and HLSL languages\.
## Table of contents
* [**atan2** function](#atan2-function)
* [**isfinite** function](#isfinite-function)
* [**lerp** function](#lerp-function)
* [**saturate** function](#saturate-function)
### atan2\(\) function
#### <code>glm.<code>**atan2**(**y**: *float*, **x**: *float*) -\> *float*</code></code>
  Arc tangent\. Returns an angle whose tangent is ``` y / x ```\. The signs of ``` x ``` and ``` y ``` are used to
  determine what quadrant the angle is in\. The range of values returned by this function
  is ``` [-PI, PI] ```\. Results are undefined if ``` x ``` and ``` y ``` are both ``` 0 ```\.
  Alias for ``` atan ```\.
#### <code>glm.<code>**atan2**(**y**: *vecN*, **x**: *vecN*) -\> *vecN*</code></code>
  Returns ``` atan(y[i], x[i]) ``` for every index ``` i ```\.
  Alias for ``` atan ```\.
### isfinite\(\) function
#### <code>glm.<code>**isfinite**(**x**: *float*) -\> *bool*</code></code>
  Test whether or not a scalar is a finite value\.
#### <code>glm.<code>**isfinite**(**x**: *vecN*) -\> *bvecN*</code></code>
  Test whether or not each vector component is a finite value\.
### lerp\(\) function
#### <code>glm.<code>**lerp**(**x**: *float*, **y**: *float*, **a**: *float*) -\> *float*</code></code>
  Returns ``` x * (1.0 - a) + y * a ```, i\.e\., the linear blend of ``` x ``` and ``` y ``` using the
  floating\-point value ``` a ```\. The value for ``` a ``` is not restricted to the range ``` [0, 1] ```\.
#### <code>glm.<code>**lerp**(**x**: *vecN*, **y**: *vecN*, **a**: *float*) -\> *vecN*</code></code>
  Returns ``` x * (1.0 - a) + y * a ```, i\.e\., the linear blend of ``` x ``` and ``` y ``` using the
  floating\-point value ``` a ```\. The value for ``` a ``` is not restricted to the range ``` [0, 1] ```\.
#### <code>glm.<code>**lerp**(**x**: *vecN*, **y**: *vecN*, **a**: *vecN*) -\> *vecN*</code></code>
  Returns ``` x * (1.0 - a) + y * a ```, i\.e\., the linear blend of ``` x ``` and ``` y ``` using the
  vector ``` a ```\. The value for ``` a ``` is not restricted to the range ``` [0, 1] ```\.
#### <code>glm.<code>**lerp**(**x**: *quat*, **y**: *quat*, **a**: *float*) -\> *quat*</code></code>
  Linear interpolation of two quaternions\. The interpolation is oriented\.
### saturate\(\) function
#### <code>glm.<code>**saturate**(**x**: *float*) -\> *float*</code></code>
  Returns ``` clamp(x, 0, 1) ```\.
#### <code>glm.<code>**saturate**(**x**: *vecN*) -\> *vecN*</code></code>
  Returns ``` clamp(x, 0, 1) ```\.
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