[ET Trac] [Einstein Toolkit] #1090: use efficient RK4 in multirate RK4 RK2 scheme

[Einstein Toolkit]

#1090: use efficient RK4 in multirate RK4 RK2 scheme
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 Reporter:  rhaas        |       Owner:     
     Type:  enhancement  |      Status:  new
 Priority:  minor        |   Milestone:     
Component:  Cactus       |     Version:     
 Keywords:  MoL          |  
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 This patch cleans up the code, improves performance of the MoL loops since
 it combines several loops into one, and reduces the required scratch
 space.

 Code originally by Erik, the imported into Zelmani by Christian Reisswig.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1090>
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