interpSpline | R Documentation |
Create an interpolation spline, either from x
and y
vectors (default
method), or from a formula
/ data.frame
combination (formula
method).
interpSpline(obj1, obj2, bSpline = FALSE, period = NULL, ord = 4L, na.action = na.fail, sparse = FALSE)
obj1 |
either a numeric vector of |
obj2 |
if |
bSpline |
if |
period |
an optional positive numeric value giving a period for a periodic interpolation spline. |
ord |
an integer specifying the spline order, the number of
coefficients per interval. ord = d+1 where d is the
degree polynomial degree. Currently, only cubic splines
( |
na.action |
a optional function which indicates what should happen
when the data contain |
sparse |
logical passed to the underlying
|
An object that inherits from (S3) class spline
. The object can be in
the B-spline representation, in which case it will be of class
nbSpline
for natural B-spline, or in the piecewise polynomial
representation, in which case it will be of class npolySpline
.
Douglas Bates and Bill Venables
splineKnots
,
splineOrder
,
periodicSpline
.
require(graphics); require(stats) ispl <- interpSpline( women$height, women$weight ) ispl2 <- interpSpline( weight ~ height, women ) # ispl and ispl2 should be the same plot( predict( ispl, seq( 55, 75, length.out = 51 ) ), type = "l" ) points( women$height, women$weight ) plot( ispl ) # plots over the range of the knots points( women$height, women$weight ) splineKnots( ispl )
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