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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 \( \dot{u} = -F(t,u) + G(t,u) \)

## See Also

TS: Scalable ODE and DAE Solvers, `TSCreate()`, `TS`, `TSSetType()`, `TSType`

## Level

beginner

## Location

src/ts/impls/implicit/radau5/radau5.c

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