The RG package provides a way to define a region of the complex plane. This is used in various eigensolvers to specify where the wanted eigenvalues are located.
| Beginner - Basic usage | RGCreate | RG | RGType |
| RGDestroy | RGSetFromOptions | RGView |
| Intermediate - Setting options for algorithms and data structures | RGCheckInside | RGGetComplement | RGSetComplement |
| RGComputeContour | RGGetType | RGSetType |
| Advanced - Setting more advanced options and customization | RGAppendOptionsPrefix | RGIntervalSetEndpoints | RGRingGetParameters |
| RGEllipseGetParameters | RGPolygonGetVertices | RGRingSetParameters |
| RGEllipseSetParameters | RGPolygonSetVertices | RGSetOptionsPrefix |
| RGGetOptionsPrefix | RGRegisterAll | |
| RGIntervalGetEndpoints | RGRegister | |
| Developer - Interfaces intended primarily for library developers, not for typical applications programmers | RGFinalizePackage | RGInitializePackage |
| RGGetScale | RGSetScale | |
| No deprecated routines | ||