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# FNAppendOptionsPrefix

Appends to the prefix used for searching for all `FN` options in the database.

## Synopsis

    #include "slepcfn.h"
    PetscErrorCode FNAppendOptionsPrefix(FN fn,const char prefix[])

Logically Collective

## Input Parameters

- fn - the math function context

- prefix - the prefix string to prepend to all `FN` option requests

## Notes

A hyphen (-) must NOT be given at the beginning of the prefix name. The first character of all runtime options is AUTOMATICALLY the hyphen.

## See Also

FN: Mathematical Functions, `FNSetOptionsPrefix()`

## Level

advanced

## Location

src/sys/classes/fn/interface/fnbasic.c

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