Revert Minmax Scaling

I have an array of value (percentages) scaled from 0 to 100: [34, 34, 84, 28, 56, 56, 0, 0, 100] I know that these values have been scaled with a MinMax scaler: V = (actu

Solution 1:

There is no way you can obtain the actual numbers back. Consider the following lists:

actuals1 = [34,  34,  84,  28,  56,  56,   0,   0, 100]
actuals2 = [3.4,  3.4,  8.4,  2.8,  5.6,  5.6,   0,   0, 10]
actuals3 = [340,  340,  840,  280,  560,  560,   0,   0, 1000]
actuals4 = [17,  17,  42,  14,  28,  280,   0, 50]

If you perform your MinMax scaling, you obtain same result with all of them so there is no unique result. That is because you obtain a parametric solution due to your undetermined system (as mentioned in Reda Drissi's comment), so any multiply of a solution is a valid solution.