supportsArg: Tests if function supports a given argument

In fields: Tools for Spatial Data

Tests if function supports a given argument

Description

Tests if the given function supports the given argument. Commonly used in fields code for determining if a covariance function supports precomputation of the distance matrix and evaluation of the covariance matrix over only the upper triangle.

Usage

supportsArg(fun=stationary.cov, arg)

Arguments

fun	The function tested for support for whether it supports the argument arg as input
arg	The argument to check if fun supports using as input

Details

Currently only stationary.cov and Exp.cov support evaluation of the covariance matrix over the upper triangle (and diagonal) only via the onlyUpper argument and distance matrix precomputation via the distMat argument.

Value

A logical indicating whether the given function supports use of the given argument

Author(s)

John Paige

See Also

stationary.cov, Exp.cov These covariance functions have the onlyUpper option allowing the user to evaluate the covariance matrix over the upper triangle and diagonal only and to pass a precomputed distance matrix

Examples

################
#Test covariance function to see if it supports evaluation of 
#covariance matrix over upper triangle only
################

supportsArg(Rad.cov, "distMat")
supportsArg(Rad.cov, "onlyUpper")
supportsArg(stationary.cov, "distMat")
supportsArg(stationary.cov, "onlyUpper")
supportsArg(Exp.cov, "distMat")
supportsArg(Exp.cov, "onlyUpper")

fields documentation built on Sept. 9, 2025, 5:39 p.m.