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# TSRADAU5
ODE solver using the external RADAU5 package, requires ./configure --download-radau5 


## Notes
This uses its own nonlinear solver and dense matrix direct solver so PETSc `SNES` and `KSP` options do not apply.

Uses its own time-step adaptivity (but uses the TS rtol and atol, and initial timestep)

Uses its own memory for the dense matrix storage and factorization

Can only handle ODEs of the form \cdot{u} = -F(t,u) + G(t,u)


## See Also
 [](ch_ts), `TSCreate()`, `TS`, `TSSetType()`, `TSType`

## Level
beginner

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ts/impls/implicit/radau5/radau5.c.html#TSRADAU5">src/ts/impls/implicit/radau5/radau5.c</A>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/ts/impls/implicit/radau5/radau5.c)


[Index of all TS routines](index.md)  
[Table of Contents for all manual pages](/manualpages/index.md)  
[Index of all manual pages](/manualpages/singleindex.md)