Hi,

2015-06-24 16:59 GMT+09:00 Ian Hinder <ian.hinder@aei.mpg.de>:

On 24 Jun 2015, at 03:15, Hee Il Kim <heeilkim@gmail.com> wrote:

Hi,

Recently, I found the multipole moment calculations in QuasiLocalMeasures show large errors, e.g. 20% for the second mass moment of my project. 

The error exists even in the test data of the thorn but it's around a few percent.

Note that the "test" directory contains regression tests, which are designed to check that the results haven't changed unintentionally when the code changes.  They are not meant to test correctness. As such, there is no claim of accuracy for their results.  In fact, they should be as small and fast as possible, which usually means that they are NOT accurate.  I'm not saying that there is no problem; just that the parameter files in the "test" directory should not be considered as tests of the correctness of the code.


I understand. But the issue is, even though I'm using sufficiently high resolution for my collapsing star study, the code calculates inaccurately the higher multipole moments for n >0, where n is the order of the Legendre polynomial. So it calculates the mass and the spin very accurately.


Which version of the code are you using?

It has not changed much recently.


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r57 | eschnett | 2015-04-27 19:05:14 +0200 (Mon, 27 Apr 2015) | 1 line

I'm using the one in ET branch,
/repos/numrel/LSUThorns/QuasiLocalMeasures/!svn/ver/54/branches/ET_2014_11

Thanks,

Hee Il