# Getting a function to pass through one

Hello! I am aware of functions and things. However I would like to write a function to get a value based off of a type and an alpha (prime example being TweenService:GetValue()) I am trying to make a way to customize the function that TweenService:GetValue returns (like to change the multiplier on the elastic enum type). I don’t know how to google it but all I know I need is some way to get a line like this

(which is easy since y=x then you just return the alpha)

This is a linear function but I would like to know how to make a curved function (or if there is any alternatives to getting a new alpha based on this method)

something kind of like this

Anyway is there an easier way to do this type of thing? (I guess bezier curves might work but idk).

I’m not sure exactly what you’re looking for, but you can do `x^2` for scaling:

Note there’s a ton of really nice functions that scale from 0 to 1. What you can do is map your number to 0 and 1, apply the transform, and then back it out again.

Consider:

``````local function quadratic(num, min, max)
return Math.map(Math.map(num, min, max, 0, 1)^2, 0, 1, min, max)
end
``````

Not sure if this is what you’re asking though.