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# SNESQNType

the type used by `SNESQN`

## Values

- `SNES_QN_LBFGS` - LBFGS variant

- `SNES_QN_BROYDEN` - Broyden variant

- `SNES_QN_BADBROYDEN` - Bad Broyden variant

## Options Database Key

- -snes_qn_type <lbfgs,broyden,badbroyden> - quasi-Newton type

## See Also

`SNES,` SNESQN`,` SNESQNSetScaleType()`,` SNESQNSetType()`,` SNESQNScaleType`,` SNESQNRestartType`,` SNESQNSetRestartType()`

## Level

intermediate

## Location

include/petscsnes.h

Index of all SNES routines
Table of Contents for all manual pages
Index of all manual pages