Hi,<br><br>Still I'm confused with the carpet reduction. The basic reduction method in Christian's code was same with mine. But I thought what I did before should be improved. First of all my expression "integration over only the coarsest level" is very inaccurate. Anyway let me ask again.<br>
<br>What people do in reduction of , e.g. "Mass = Integration of density * volume_measure" is;<br><br>------ Method I --------<br>* In local mode at mol_pseudoevolution or poststep<br>define Integrand = density ! note it's not "density * volume_measure"<br>
<br>* In global mode at analysis<br>CCTK_Reduce(Integrand --> Mass_temp)<br>Mass = Mass_temp * product(cctk_delta_space)<br>------------------------------<br><br>Why do people define "integrand = density" not as "density * volume_measure"? However, if i do take the latter, then I get very weird result, so people might have not taken that. To my understanding, the above Method I will produce;<br>
<br>Result I: Mass = (Sum_reflev=0 of capret weighted density(i,j,k) * dV_0) + (Sum_reflev=1 of carpet weighted density(i,j,k) * dV_0) + ... <br><br>But what I wanted (expected) to get by defining integrand = density * volume_measure" is more accurate one;<br>
<br>Result II: Mass = (Sum_reflev=0 of carpet weighted density(i,j,k) * dV_0) + (Sum_reflev=1 of carpet weighted density(i,j,k) * 1/8 * dV_0) + ...<br><br>What is the above Method I doing for? Result I or Result II, or something else?<br>
The new reduction API mentioned in the reference manual is still underdevelopment?<br><br>Thanks in advance,<br><br>Hee Il<br><br><br><br><div class="gmail_quote">2011/1/6 Hee Il Kim <span dir="ltr"><<a href="mailto:heeilkim@gmail.com">heeilkim@gmail.com</a>></span><br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">Christian, thanks so much !<br><br>Your code seems to contain everything I wanted to calculate.<br>
<br>There's one minor mismatched declaration in ML_ADMQuantities which should be fixed anyhow.<br><br>####<br><br>[khi@zenith src]$ diff ML_ADMQuantities.c.ori ML_ADMQuantities.c<br>
56c56<br>< const char *groups[] = {"grid::coordinates","Grid::coordinates","McLachlan::ML_curv","McLachlan::ML_Gamma","McLachlan::ML_lapse","McLachlan::ML_log_confac","McLachlan::ML_metric","McLachlan::ML_shift","McLachlan::ML_trace_curv","ML_ADMQuantities::ML_Jadm","ML_ADMQuantities::ML_Madm"};<br>
---<br>> const char *groups[] = {"grid::coordinates","Grid::coordinates","ML_BSSN::ML_curv","ML_BSSN::ML_Gamma","ML_BSSN::ML_lapse","ML_BSSN::ML_log_confac","ML_BSSN::ML_metric","ML_BSSN::ML_shift","ML_BSSN::ML_trace_curv","ML_ADMQuantities::ML_Jadm","ML_ADMQuantities::ML_Madm"};<br>
<br>####<br><br>Thanks again,<br><br>Hee Il<br><br><div class="gmail_quote">2011/1/5 Christian D. Ott <span dir="ltr"><<a href="mailto:cott@tapir.caltech.edu" target="_blank">cott@tapir.caltech.edu</a>></span><br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<br>
Dear Hee Il,<br>
<br>
I agree that getting this right is tricky. You must set up your grid<br>
functions that you want to reduce in MoL_PseudoEvolution in local<br>
mode, then do the reduction in CCTK_Analysis in global mode.<br>
<br>
I am attaching a Thorn called ZelmaniAnalysis that I use for the<br>
kinds of things you want. The reduction works with Carpet.<br>
<br>
Best,<br>
<br>
- Christian<br>
<div><div></div><div><br>
<br>
<br>
On Wed, Jan 05, 2011 at 09:18:21PM +0900, Hee Il Kim wrote:<br>
> Hi,<br>
><br>
> Belated Happy New Year !<br>
><br>
> I am writing a simple code for the calculation of ADM mass and angular<br>
> momentum by using ML_ADMQuantities. As you know, it requires reduction<br>
> procedure for the summation of the integrand, e.g., density * volume<br>
> measure. I've tried various reduction APIs including old deprecated one, but<br>
> I could only succeed in the integration only over the coarsest grid level,<br>
> which was not accurate.<br>
><br>
> If I use the new reduction API in the reference manual of Cactus,<br>
> CCTK_ReduceGridArrays;<br>
><br>
> CCTK_ReduceGridArrays(const cGH *GH,<br>
> int dest_processor,<br>
> int local_reduce_handle,<br>
> int param_table_handle,<br>
> int N_input_arrays,<br>
> const CCTK_INT input_array_variable_indices[],<br>
> int M_output_values,<br>
> const CCTK_INT output_value_type_codes[],<br>
> void* const output_values[]);<br>
><br>
> , I encounter the following error<br>
> ....<br>
> WARNING[L3,P0] (Cactus): CCTK_ReduceGridArrays: no grid array reduction<br>
> registered<br>
> WARNING level 0 in thorn ML_Analysis processor 0 host compute-0-5.local<br>
> (line 159 of Evaluate_ADMQuantities.F90):<br>
> -> Failed to integrate J_z<br>
><br>
> Param_table_handle is not clear to me but it seems not causing the problem.<br>
> The reduction operators are registered by CactusBase/LocalReduce.<br>
><br>
> Could you let me know which reduction function I have to use for this<br>
> calculation? I mean the integration over the whole grid levels. Should I do<br>
> loop over refinenment levels;<br>
> ...<br>
> do loop over reflev<br>
> call CCTK_Reduce<br>
> enddo<br>
> ...<br>
><br>
> Thanks in advance,<br>
><br>
> Hee Il<br>
<br>
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</blockquote></div><br>
</blockquote></div><br>