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Hi,
this is a simple implementation of the pseudo-log transform, a.k.a as the asinh transform. This is a transform which behaves as sign(x)*log(|x|) when x is large and as x when x is small. Such a transform was mentionned in the issue #48. I've added two parameters, one which is used to define when x is small or not and the other to mimic a logarithm with a different base than the natural one (exp(1)).
Erwan