[R] How do I find the first derivative from the cubic natural spline

[Jassy Molitor]

Hi, Everyboday,
   Does anybody know how to get the first derivative form the cubic natural 
spline matrix?


Thanks !!!


Jassy

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Nuoo-Ting (Jassy) Molitor, MS, Junior Statistician
Division of Biostatistics
Department of Preventive Medicine
University of Southern California          Tel: (323) 442-2584
1540 Alcazar St., CHP-210F               Fax: (323) 442-3272
Los Angeles, CA 90089-9011, USA     e-mail: nuootinl at usc.edu
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