RE: [Ifeffit] Is there a physical meaning to a negative SO2

2007-01-09 Thread Anatoly Frenkel
A totally unrelated joke: If anyone ever watched Da Ali G show on HBO, there was an episode, when Ali G interviews a famous economics professor. The first question was: Professor, what is a PIN code? A. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of

[Ifeffit] Re: ZnO Artemis demo - problem with dr parameter

2007-01-09 Thread Scott Calvin
Hi Craig, I'm cc'ing this to the Ifeffit mailing list, as others may encounter similar problems. It's not your novice-ness that's causing the problem; it's a version issue. I wrote the ZnO example when an older version of the software was current. Since then, dr became a reserved variable,

Re: [Ifeffit] Is there a physical meaning to a negative SO2

2007-01-09 Thread Scott Calvin
Hi Todd, Your paragraph below is correct; i.e. you do not have a physically realistic model. One common cause of a negative S02 is that the model also is off by half an oscillation. After all, the negative S02 turns the signal upside down, shifting it by half an oscillation can then cause a

RE: [Ifeffit] Is there a physical meaning to a negative SO2

2007-01-09 Thread Kelly, Shelly D.
Hi Todd, One thing to try is to set s02 to a positive value and all the other variables to reasonable values and then look at the real or imaginary parts of the Fourier transform and also look at the chi(k) spectra. You should see the affect that Scott mentioned. Shelly -Original

Re: [Ifeffit] linear combination using program code of athena

2007-01-09 Thread Bernd Griesebock
Thank you very much Bruce, that help me a lot. I finally fixed it by using a slightly modulated part of the source code of Athena. At this point I just want to report a little bug I found using the linear combination function of Athena. Since I didn't use the plot window I didn't realized it