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Diffstat (limited to 'doc/documentation.tex')
| -rw-r--r-- | doc/documentation.tex | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/doc/documentation.tex b/doc/documentation.tex index 86ace22..35e02b8 100644 --- a/doc/documentation.tex +++ b/doc/documentation.tex @@ -230,9 +230,18 @@ with the flesh. \section{Symmetries for Grid Functions} If your problem and initial data allow it, \verb|CartGrid3D| -allows you to enforce either an even or odd parity -symmetry condition for any grid functions at each -coordinate axis. For a function $\phi(x,y,z)$, +allows you to enforce even or odd parity for any grid function%%% +\footnote{%%% + Alas, with the present implementation only + {\tt CCTK\_REAL} grid functions work correctly; + all others give garbage results. This is a + bug, which should get fixed sometime or other\dots{} + Indeed, we haven't yet decided how complex grid + functions should be handled here. Contact + Peter Diener and/or Jonathan Thornburg if you + have ideas and/or want to help with this. + }%%% +{} at (across) each coordinate axis. For a function $\phi(x,y,z)$, even parity symmetry on the $x$-axis means $$ \phi(-x,y,z) = \phi(x,y,z) |