Exponential Basis Function Values
Exponential Basis Function Values
DESCRIPTION:
Evaluates a set of exponential basis functions, or a derivative of these
functions, at a set of arguments.
USAGE:
expon(x, ratevec=1, nderiv=0)
REQUIRED ARGUMENTS:
- x
-
A vector of argument values at which the exponential basis functions are to
evaluated.
OPTIONAL ARGUMENTS:
- ratevec
-
A vector of rate values defining the exponential basis functions. If
b is such a rate value, the corresponding basis function is
ebx. The number of basis functions is equal to the
number of rate constants. The default is the single constant one.
- nderiv
-
The derivative to be evaluated. The derivative must not exceed the
order. The default derivative is 0, meaning that the basis functions
themselves are evaluated.
VALUE:
A matrix of function values. The number of rows equals the number of
arguments, and the number of columns equals the number of basis
EXAMPLES:
# set up a set of 11 argument values
x <- seq(0,1,0.1)
# compute values for three exponential basis functions
ratevec <- c(-1, 0, 1)
# compute the basis function values
basismat <- expon(x, ratevec)