[R] Idea/package to "linearize a curve" along the diagonal?

[Yvonnick Noel]

> I am trying to normalize some data. First I fitted a principal curve
> (using the LCPM package), but now I would like to apply a
> transformation so that the curve becomes a "straight diagonal line" on
> the plot.  The data used to fit the curve would then be normalized by
> applying the same transformation to it.

It is unclear to me what you mean by "diagonal" but I suspect what 
you're looking for is to locate projected points onto the unfolded curve.

That is exactly what coordinates on the principal curve would give you.

Sorry if I misunderstood your point,

Yvonnick Noel
University of Brittany,
Rennes, France