Heads Up: Reciprocal is a mathematical term. The best way to explain it is a flipped fraction. E.G: The reciprocal of a fifth is 5.
Based on that definition above, I want to find the reciprocal of any number between 0 and 1 which I will then use to set the transparency of a GUI.
Is there a built-in function or do I need to create some equation?
The same way that you find the reciprocal outside of Lua. 1/x is the reciprocal of x, as is x^-1.
Either way, you really don't want to find the reciprocal of a fractional value for the transparency, because the transparency is already a fractional part.
The thing is that when x = 0, I want the transparency to be 1
You mean, you want to do Transparency = 1-x
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2 comments
What on earth are you actually trying to do? The reciprocal has nothing to do with it. http://meta.stackexchange.com/questions/66377/what-is-the-xy-problem
Edit your question to include example input and expected output.