Periodic cardinal cubic splines
     
    
    Usage
    periodic_csplines(x, pos)
 
    
    Arguments
- x
- Abscissas of the knots 
- pos
- Requested positions 
 
    
    Value
    A matrix (len(pos) x len(knots))
     
    
    Examples
    s<-periodic_csplines(x = c(0,.2,.3, .9,.95, 1), pos=seq(0,1,0.01))
matplot(s, type='l')
