fda: expon – R documentation

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expon

Exponential Basis Function Values

Evaluates a set of exponential basis functions, or a derivative of these functions, at a set of arguments.

expon(x, ratevec=1, nderiv=0)

`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.

There are no restrictions on the rate constants.

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