Hi all,
this hopefully is a dumb question, but I cannot for the life of me get
access to the x,y,z,r coordinates defined in CartGrid3D.
Suppose I have a thorn X that wants to access these coordinates from
test.cc, then the thorn should inherit: grid, the .cc should #include
"cctk_Arguments.h" and the line that accesses, say x[0], should be
called after DECLARE_CCTK_ARGUMENTS.
Unfortunately doing this results in an error:
[maths02:86267] *** Process received signal ***
[maths02:86267] Signal: Segmentation fault (11)
[maths02:86267] Signal code: Address not mapped (1)
[maths02:86267] Failing at address: (nil)
Which is analogous to the error message you get by defining a grid
variable in interface.ccl without the accompanying STORAGE: in
schedule.ccl, i.e. the memory is not allocated.
I am using Llama as my coordinate system, but I know this basically is a
wrapper for CartGrid3D and these coordinates are still set. I see the
printout from CartGrid3D.
I try to access these coordinates at, for example, CCTK_INITIAL, when
the grid structure is already setup. I have also tried later time bins
such as CCTK_POSTSTEP.
Example files that access these coordinates are:
CTGBase::debug.cc
ADMDerivatives::calc_derivs.cc
Coordinates::cylinderinbox.cc
However I am not having any luck reverse-engineering these.
Any ideas would be appreciated.
Chris
--
Dr Chris Stevens
Department of Mathematics
Rhodes University
Room 5
Ph: +27 46 603 8932
Web: www.chrisdoesmaths.com <http://www.chrisdoesmaths.com>
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