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 | FNCreate | FN | FNType |
| FNDestroy | FNSetFromOptions | FNView |
| Intermediate - Setting options for algorithms and data structures | FNCombineGetChildren | FNGetType | FNRationalSetDenominator |
| FNCombineSetChildren | FNPhiGetIndex | FNRationalSetNumerator |
| FNEvaluateDerivative | FNPhiSetIndex | FNSetScale |
| FNEvaluateFunction | FNRationalGetDenominator | FNSetType |
| FNGetScale | FNRationalGetNumerator | |
| Advanced - Setting more advanced options and customization | FNAppendOptionsPrefix | FNGetOptionsPrefix | FNSetOptionsPrefix |
| FNCombineType | FNRegisterAll | |
| FNEvaluateFunctionMat | FNRegister | |
| Developer - Interfaces intended primarily for library developers, not for typical applications programmers | FNDuplicate | FNFinalizePackage | FNInitializePackage |
| No deprecated routines | ||