take_derivative {lgspline} | R Documentation |
Calculate Derivatives of Polynomial Terms
Description
Computes first or second derivatives of polynomial terms in a design matrix with respect to a specified variable. Handles polynomial terms up to fourth degree.
Usage
take_derivative(dat, var, second = FALSE, scale)
Arguments
dat |
Numeric matrix; design matrix containing polynomial basis expansions |
var |
Character; column name of variable to differentiate with respect to |
second |
Logical; if TRUE compute second derivative, if FALSE compute first derivative (default FALSE) |
scale |
Numeric; scaling factor for normalization |
Value
Numeric matrix containing derivatives of polynomial terms, with same dimensions as input matrix
[Package lgspline version 0.2.0 Index]