# Meep release notes

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Here, we describe what has changed between releases of the Meep package. You can also refer to the NEWS file in the Meep package (or the ChangeLog file for a more detailed listing).

## Meep 0.9

21 August 2006

• eps-averaging? is now turned on by default (in libctl interface), using much-improved algorithm by Ardavan Farjadpour. This greatly improves accuracy, and also allows continuous tuning of geometric parameters. (See our upcoming paper in Optics Lett., with a preprint at Citing Meep.) New input variables subpixel-tol and subpixel-maxeval to control the accuracy of the subpixel averaging.
• Support for χ(2) (Pockels) as well as χ(3) (Kerr) nonlinearities.
• Symmetries no longer require the cell size to be an even number of pixels. Previously, Meep exited with an error in this case, whereas now it simply adds an extra pixel to the cell size as needed.
• New with-prefix step function to allow you to use a different filename-prefix for selected outputs.
• New feature for output-png: built-in shell variable \$EPS that refers to the last-output epsilon .h5 file, which you can use to easily add dielectric contours/overlays to the field output image.
• Added output-png+h5 function that outputs both .png and .h5 files.
• New functions flux-in-box, electric-energy-in-box, magnetic-energy-in-box, and field-energy-in-box (convenience wrappers around C++ functions).
• Bug fix in Kerr nonlinearity: chi3 was accidentally scaled by $\varepsilon^4$ factor.
• Bug fix: if you specified three or more symmetries, at most two symmetries were used (ignoring the rest).
• Bug fix in rotate2 symmetry, which wasn't working correctly.
• Bug fix in add-flux for multiple flux regions, thanks to K. Choi.
• Bug fix in harminv where it wouldn't allow you to call harminv more than once for the same run loop; thanks to Aristos Karalis.
• Bug fix in save-flux/load-flux that prevented it from working properly without output directories, thanks to Karl Koch.
• Fixed abort that sometimes occurred due to rounding when the source was the same width as the cell (thanks to G. J. Parker).
• Fixed minor build problems on Cygwin, SGI, and other systems, thanks to Christopher Kang, Robyn Landers, Florencio Garcia, and others.

## Meep 0.9

1 April 2006

• Initial public release.