Rescaling

This is an efficient function for rescaling n-dimensional arrays.

def rescale( data, newmin, newmax ):
    oldmin, oldmax = np.min( data ), np.max( data )
    newscale = float( newmax - newmin )
    oldscale = float( oldmax - oldmin )
    if oldscale == 0: return None
    ratio = float( newscale / oldscale )
    c = data.copy()
    c -= oldmin
    c *= ratio
    c += newmin
    return c