# lerp

## Returns the linear interpolation of two input
values by the given amount.

### Syntax:

lerp(a, b, amt)

Argument |
Description |

a |
The first value. |

b |
The second value. |

amt |
The amount to interpolate. |

**Returns:** Real.

### Description

With this function you can find the value that equates to the
position between two other values for a given percentage. So if you
do, for example:

lerp(0, 10, 0.5)

you would get the return value of 5, which is 50% of the input
values. You can extrapolate using this function too, by supplying a
positive or negative value for the interpolation amount so that
doing something like:

lerp(0, 10, 2)

will return a value of 20.

### Example:

xx = lerp(x, x + hspeed, room_speed);

yy = lerp(y, y + vspeed, room_speed);

The above code uses the linear interpolation function to predict
where an instance would have moved to after one second of game
time.

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