[R] get the value of a biplane

Rui Barradas ruipbarradas at sapo.pt
Sun May 28 18:37:07 CEST 2017


Since function splines::bs returns an object of class bs in order to 
read the help page for function predict you need


The syntax would be

## S3 method for class 'bs'
predict(object, newx, ...)

Please read that help page and maybe you'll get the answer you need.

Hope this helps,

Rui Barradas

Em 28-05-2017 15:51, Glenn Schultz escreveu:
> If is specify a spline basis as follows
> knots <- c(6, 12, 22, 30, 35)
> x <- c(0.0, .25, 1.0, 2.0, 3.0)
> SCurve <- bs(x = x, knots = knots, intercept = FALSE, Boundary.knots =
> c(0,3.5))
> I would like to now get the spline value for new values of x.  However,
> when I use predict the new basis is returned and I would like to get the
> value.  Nothing has worked so far and ?predict plus examples only show
> prediction from linear models.  Is there a way to extract the value from
> a defined spline?
> Best Regards,
> Glenn
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