polyg | R Documentation |
Evaluates a set of polygonal basis functions, or a derivative of these functions, at a set of arguments.
polyg(x, argvals, nderiv=0)
x |
a vector of argument values at which the polygonal basis functions are to evaluated. |
argvals |
a strictly increasing set of argument values containing the range of x within it that defines the polygonal basis. The default is x itself. |
nderiv |
the order of derivative to be evaluated. The derivative must not exceed one. The default derivative is 0, meaning that the basis functions themselves are evaluated. |
a matrix of function values. The number of rows equals the number of arguments, and the number of columns equals the number of basis
create.polygonal.basis
,
polygpen
oldpar <- par(no.readonly=TRUE)
# set up a set of 21 argument values
x <- seq(0,1,0.05)
# set up a set of 11 argument values
argvals <- seq(0,1,0.1)
# with the default period (1) and derivative (0)
basismat <- polyg(x, argvals)
# plot the basis functions
matplot(x, basismat, type="l")
par(oldpar)
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