R: Exponential Basis Function Values

expon {fda} | R Documentation

## 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)

### Arguments

`x` | a vector of values at which the basis functions are to be evaluated.
`ratevec` | a vector of rate or time constants defining the exponential functions. That is, if $a$ is the value of an element of this vector, then the corresponding basis function is $exp(at)$. The number of basis functions is equal to the length of `ratevec`.
`nderiv` | a nonnegative integer specifying an order of derivative to be computed. The default is 0, or the basis function value.

### Details

There are no restrictions on the rate constants.

### Value

a matrix of basis function values with rows corresponding to argument values and columns to basis functions.

### See Also

`exponpen`

[Package fda version 2.4.8 Index]