<p>Note that you cannot do 5 stages with rks3 because 5 is not square (such a method would be in a different class). Use 4 or 9 stages with rks3.</p>
<div class="gmail_quote">On Jul 18, 2011 6:42 PM, "Sean Farley" <<a href="mailto:sean@mcs.anl.gov">sean@mcs.anl.gov</a>> wrote:<br type="attribution">>><br>>> Methods can be chosen with -ts_ssp_type {rks2,rks3,rk104}<br>
>><br>>> rks2: Second order methods with any number s>1 of stages. c_eff = (s-1)/s<br>>><br>>> rks3: Third order methods with s=n^2 stages, n>1. c_eff = (s-n)/s<br>>><br>>> rk104: A 10-stage fourth order method. c_eff = 0.6<br>
>><br>> <br>> This means that there there are only three options for -ts_ssp_type. Namely,<br>> <br>> -ts_ssp_type rks2<br>> -ts_ssp_type rks3<br>> -ts_ssp_type rk104<br>> <br>>> However, when I write<br>
>><br>>> -ts_ssp_type rk53<br>>><br>> <br>> Therefore, this is not even close to being valid. What are you trying to do?<br>> Get 5 work stages? You can see other ssp options with the -h option<br>
> (probably helps to pipe the output to 'grep'),<br>> <br>> ./program -ts_type ssp -h | grep ssp<br>> -ts_type <beuler>: TS method (one of) euler beuler cn pseudo gl ssp theta<br>> alpha<br>
> -ts_ssp_type <rk104>: Type of SSP method (one of) rks2 rks3 rk104<br>> (TSSSPSetType)<br>> -ts_ssp_nstages <5>: Number of stages (TSSSPSetNumStages)<br>> <br>> So, you would probably want the following options,<br>
> <br>> ./program -ts_type ssp -ts_ssp_type rks3 -ts_ssp_nstages 5<br>> <br>> but keep in mind that 5 is the default for -ts_ssp_nstages.<br>> <br>> Hope that helps.<br>> <br>> Sean<br></div>