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I'm currently struggling with inverting a value on the non-continuous scale 

-2 0 1 5

to a value on the following (inverted) scale

5 1 0 -2

What I tried before is the commonly suggested approach of 

value = maxOfScale + minOfScale - value

but this seems only to evaluate correctly when using non-negative values.

Is there a fairly straight forward approach for this?

raphael
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  • i am not entirely sure what you want. Do have a list of $a_1,\dots,a_n$ and a function that satisfy $f(a_j) = a_{n-j+1}$? – Nathanael Skrepek Mar 21 '17 at 09:38
  • @NathanaelSkrepek Thanks for your answer! Yes, basically, I'm looking for a transformation function for a given input on the first scale which satisfies the constraint you stated but without the use of a list of elements. – raphael Mar 21 '17 at 10:54
  • I don't think that this is possible for an arbitrary list – Nathanael Skrepek Mar 21 '17 at 13:15

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