Timeline for How do you debug numerical code, what could be source of this oscillatory error?

12 events

when toggle format	what		by	license	comment
Mar 17, 2018 at 15:02	vote	accept	boyfarrell
Aug 7, 2013 at 12:46	history	edited	boyfarrell	CC BY-SA 3.0	Fixed link.
Jun 22, 2013 at 23:21	answer	added	Wolfgang Bangerth		timeline score: 10
Jun 21, 2013 at 23:03	history	tweeted			twitter.com/#!/StackSciComp/status/348214595661475841
Jun 21, 2013 at 11:00	history	edited	boyfarrell	CC BY-SA 3.0	Included a different movie.
Jun 21, 2013 at 10:50	history	edited	boyfarrell	CC BY-SA 3.0	Updated with solution.
Jun 21, 2013 at 9:01	comment	added	boyfarrell		I tried that, it gives broadly the same. But now I feel stupid, I was testing for a sign error... setting $a=0$ and $d<0$ makes it work (in the diffusion limit, yes negative diffusion makes it work!). So for future reference, the above could be consistent with a sign error. Not completely tested yet so I will report back soon! PS. thanks for the compliment :)
Jun 21, 2013 at 8:54	comment	added	Jan		I admire your conscentious approach to this problem. Are these plots from the time-dependent equations? If yes, what do you observe for $\theta = 0,0.5,1$?
Jun 21, 2013 at 8:08	history	edited	boyfarrell	CC BY-SA 3.0	Error in title
Jun 21, 2013 at 7:39	history	edited	boyfarrell	CC BY-SA 3.0	Updated links to the project page.
Jun 21, 2013 at 6:39	history	edited	boyfarrell	CC BY-SA 3.0	Updated with more background.
Jun 21, 2013 at 6:23	history	asked	boyfarrell	CC BY-SA 3.0