The FN package provides the functionality to represent a simple mathematical function such as an exponential, a polynomial or a rational function. This is used as a building block for defining the function associated to the nonlinear eigenproblem, as well as for specifying which function to use when computing the action of a matrix function on a vector.
| Beginner - Basic usage | FN | FNDestroy | FNType |
| FNCreate | FNSetFromOptions | FNView |
| Intermediate - Setting options for algorithms and data structures | FNCombineGetChildren | FNGetType | FNRationalSetNumerator |
| FNCombineSetChildren | FNPhiGetIndex | FNSetMethod |
| FNEvaluateDerivative | FNPhiSetIndex | FNSetScale |
| FNEvaluateFunction | FNRationalGetDenominator | FNSetType |
| FNGetMethod | FNRationalGetNumerator | FNViewFromOptions |
| FNGetScale | FNRationalSetDenominator | |
| Advanced - Setting more advanced options and customization | FNAppendOptionsPrefix | FNGetOptionsPrefix | FNRegisterAll |
| FNCombineType | FNGetParallel | FNSetOptionsPrefix |
| FNEvaluateFunctionMat | FNParallelType | FNSetParallel |
| FNEvaluateFunctionMatVec | FNRegister | |
| Developer - Interfaces intended primarily for library developers, not for typical applications programmers | FNDuplicate | FNFinalizePackage | FNInitializePackage |
| No deprecated routines | ||