[R] Fits & splines

[Eric-Olivier Le Bigot]

   Hello all,

   Do you know of convenient functions that can do:

1) a fit "f(x)" of data points with a spline, and *then*

2) weighted fits of other data points ** with a model of the form 
a*f(x-x0) **? [i.e., the goal is to find a and x0, ideally with their 
covariance matrix], and

3) if possible, the same as (2) above, but with the same model *convoluted 
with a gaussian* (whose height and width should be fitted).

R looks really powerful for doing these kind of things, and I'd like to use 
it for analyzing X-ray spectra.

After doing some research, I came accross a few packages: gss, stats, assist, 
psline; but I have not yet been able to figure out a way of performing the 
fits with splines described in (2) and (3) above.

Any help would be welcome!

EOL [new to R, and not a statistician--only a physicist]

--
Dr. Eric-Olivier LE BIGOT (EOL)                     CNRS Associate Researcher
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