Normalizing from [0.5 - 1] to [0 - 1]

Question

I\'m kind of stuck here, I guess it\'s a bit of a brain teaser. If I have numbers in the range between 0.5 to 1 how can I normalize it to be between 0 to 1?

Thanks for a

Answer 1

Subtract 0.5 (giving you a new range of 0 - 0.5) then multiply by 2.

double normalize( double x )
{
    // I'll leave range validation up to you
    return (x - 0.5) * 2;
}