Scaling range of values with negative numbers

Posted by Pradeep Kumar on Stack Overflow See other posts from Stack Overflow or by Pradeep Kumar
Published on 2012-10-30T10:46:15Z Indexed on 2012/10/30 11:01 UTC
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scale

How can I scale a set of values to fit a new range if they include negative numbers?

For example, I have a set of numbers (-10, -9, 1, 4, 10) which have to scaled to a range [0 1], such that -10 maps to 0, and 10 maps to 1.

The regular method for an arbitrary number 'x' would be: (x - from_min) * (to_max - to_min) / (from_max - from_min) + to_min

but this does not work for negative numbers. Any help is appreciated. Thanks!!

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