Recent work on addressing issues with the CellML specification have focussed on reset rules (see https://tracker.physiomeproject.org/show_bug.cgi?id=1543). Some of the discussion on reset rules has touched on how delays may need to be expressed, though this is still unresolved. I have added a comment to tracker item 70 pointing to tracker item 1543.
Please join these discussions, we would really appreciate your input. Regards, Randall > -----Original Message----- > From: [email protected] [mailto:cellml-discussion- > [email protected]] On Behalf Of Dom Layfield > Sent: Wednesday, 15 July 2009 8:13 a.m. > To: [email protected] > Subject: [cellml-discussion] Time delays in CellML models? > > Is there a recommended/suggested way to add time-delays to a CellML model? > > I found this model: "A model of HIV-1 pathogenesis that includes an > intracellular delay" > http://models.cellml.org/exposure/a0c93131fa0a4cc2b1740fdc4076ac78 > However, this model will not run in current versions of either PCEnv or COR. > > I also found this tracker item: > https://tracker.physiomeproject.org/show_bug.cgi?id=70 > > Everything looks pretty unresolved, with no comments since Feb '08. > Has there been any progress on this? > > If not, are there any suggested workarounds? It seems that I might be > able to add a variable to a component to provide dynamics that > approximate a straight delay. But I can't think of how to do it. > > As in the model referenced above, there are legions of instances where > a time delay would be useful: incubation periods, dissolution times, > transit time etc. In my case, I'm trying to model the passage of food > through the digestive tract. And unless I incorporate some sort of > delay, I'll have the problem of material starting to exit the distal > end of the tract immediately that any enters the proximal end. With > an organ that is ~8 m long, this doesn't make much physical sense. > > Can anyone provide any advice? > > Thanks, > > -- Dom Layfield > _______________________________________________ > cellml-discussion mailing list > [email protected] > http://www.cellml.org/mailman/listinfo/cellml-discussion _______________________________________________ cellml-discussion mailing list [email protected] http://www.cellml.org/mailman/listinfo/cellml-discussion
