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<span style="font-size: 14px;" class="">Dear Sir or Madam,</span>
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<div class=""><span style="font-size: 14px;" class="">I am a student of the University of Macau, I am trying to learn PETSc and I have two questions about the TSIRK.</span></div>
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<div class=""><span style="font-size: 14px;" class="">1.PETSc 3.16.0 adds “irk" for the TSType and it offers many options like
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TSIRK1BEE, TSIRK2C, TSIRK2D, TSIRK2E, TSIRK3, TSIRKL2</span>, I am not sure how to use them and if only Gaussian points can be used (Radau or Labatto may not offered). </span></div>
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<div class=""><span style="font-size: 14px;" class="">2.Maybe there is a similar option to implement the fully implicit Runge-Kutta methods in PETSc 3.15 or other previous versions? For example, if I want to solve a time dependent problem with a butcher table
like below, do I need to input it by myself?</span></div>
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<div class=""><span style="font-size: 14px;" class="">Thank you very much for your help.</span></div>
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<div class=""><span style="font-size: 14px;" class="">Best regards,</span></div>
<div class=""><span style="font-size: 14px;" class="">Wang Jing-Yuan</span></div>
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