[R] Pspline smoothing

[Martin Renner]

Dear all,

I'm trying to use the Pspline add-on package to fit a quintic spline 
(norder =3), but I keep running into a Singularity error.

>  traj.spl <- smooth.Pspline(time, x, norder=3 )
Error in smooth.Pspline(time, x, norder = 3) :
	Singularity error in solving equations
>

Playing around with the other parameters produces an "unused arguments" error:

>  traj.spl <- smooth.Pspline(time, x, norder=3 , cv=FALSE, method=3)
Error in smooth.Pspline(time, x, norder = 3, cv = FALSE, method = 3) :
	unused argument(s) (cv ...)
>

Setting norder=2 doesn't produce an error but summary indicates norder=1.

>  traj.spl <- sm.spline (time,x, norder=2, cv=FALSE)
>  summary (traj.spl)
        Length Class  Mode
norder  1     -none- numeric
x      36     -none- numeric
ysmth  36     -none- numeric
lev    36     -none- numeric
gcv     1     -none- numeric
cv      1     -none- numeric
df      1     -none- numeric
spar    1     -none- numeric
call    6     -none- call
>

Has anybody been able to fit quintic splines with Pspline or has some 
advise how to avoid the Singularity error?

Thank you,
	Martin

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