[R] Questions about piecewise spline fitting

[Gang Liang]

Hi All,

I want to fit a piecewise spline of degree 1, i.e. a spline consisting of a 
straight line over each piece. I downloaded the R package pspline, then I 
have following questions:

1. in the program, the degree of the spline is specified by 2*norder-1. Why 
do they adopt such scheme that we can only fit a spline with odd degree?

2. norder cannot be set to 1. Is there any specific reason for doing so?

Maybe I need to code this by myself. So I'd like to hear your advices.

Thanks in advance,
Gang


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