Polygonal Basis Function Values
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
# 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")
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