Francisco

There is no respective reduction operation in Cactus. What you can do is to create a 1d array for the values in the z direction -- on each process --, initialize it to zero, and then add this process's local contribution to that array. Cactus then has a "1d local array reduction" function that you can call, which calculates the global result.

-erik


On Wed, Mar 29, 2017 at 8:24 PM, Francisco Guzman <guzman@ifm.umich.mx> wrote:

Dear all,

Assume I have a thorn mounted on Carpet, completely unrelated to any GR thorn (say my_wavetoy) .

Is there a way to estimate the integral of a grid function on every slice of z=constant?

This reminds me the outflow thorn that is capable of estimating the integral of fluxes (grid functions) across a spherical surface.

I wonder whether there is something similar to integrate a flux (a given grid function of my choice) across z=constant planes:

- perhaps a reduction operator from Carpet
- a similar thorn to outflow

Thanks in advance,
Francisco


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Erik Schnetter <schnetter@cct.lsu.edu>
http://www.perimeterinstitute.ca/personal/eschnetter/