registeredC: Information objects that register C and FORTRAN functions.
In fields: Tools for Spatial Data

registeringCode

R Documentation

Information objects that register C and FORTRAN functions.

Description

These are objects of class CallRoutine or FortranRoutine and also NativeSymbolInfo They provide information for compiledfunctions called with .Call, or .Fortran. Ordinarily one would not need to consult these and they are used to make the search among dynamically loaded libraries ( in particular the fields library) have less ambiguity and also be faster. These are created when the package/library is loaded are have their definitions from the compliation of init.c in the package source (src) directory.

Format

The format is a list with components:

name: The (registration ?) name of the C function.
address: See NativeSymbolInfo.
dll: Dynamically linked library information.
numParameters: Number of calling arguments in function.

Details

addToDiagC: adds diagonal elements to a matrix. See mKrig.
ExponentialUpperC: Fills in upper triangle of a matrix with the exponential covariance function. See ExponentialUpper
compactToMatC: Converts compact format to full matrix format. See compactToMat.
multebC: Mulitplies a vector/matrix with an exponential covariance function. See exp.cov
multwendlandg: This has been mysteriously included but it is not a function!
mltdrb: Evaluates the derivatives of thin plate sline radial basis functions. See rad.cov.
RdistC: Euclidean distance function between sets of coordinates. See rdist.
distMatHaversin: Used in RdistEarth.
distMatHaversin2: Used in RdistEarth.

See package_native_routine_registration_skeleton for the utility used to create these data objects.

It is not clear why these routines have been flagged as needing documentation while other routines have not.

References

For background on registering C, C++ and Fortran functions see 5.4 of Writing R Extensions. For this package refer to the C code in src/intit.c as an example.