[R] Scaling values 0-255 -> -1 , 1 - how can this be done?

[S Ellison]

 > Subject: Re: [R] Scaling values 0-255 -> -1 , 1 - how can 
> this be done?

#Also by taking advantage of numerical interpretation of booleans:
x<- sample(255)  #toy data

2*( x > 127.5 )  - 1

#S Ellison

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