Matthew Knepley <[email protected]> writes:

On Tue, Oct 5, 2021 at 12:42 AM Wang Jingyuan <[email protected]> wrote:

...

Dear Sir or Madam,

I am a student of the University of Macau, I am trying to learn PETSc and I have two questions about the TSIRK.

1.PETSc 3.16.0 adds “irk" for the TSType and it offers many options like TSIRK1BEE, TSIRK2C, TSIRK2D, TSIRK2E, TSIRK3, TSIRKL2,

The types you mention above do not exist. For instance, the first one "TSIRK1BEE" is actually https://petsc.org/main/docs/manualpages/TS/TSARKIMEX1BEE.html

As Ed Bueler has commented, these non-existent types are incorrectly listed in the man page (people like me missed those copy/paste remnants during code review). https://petsc.org/main/docs/manualpages/TS/TSIRK.html The 1BEE and related types are diagonally implicit, so don't make sense under TSIRK. We would like to add Radau and Lobatto methods to PETSc -- it would be a relatively easy contribution.