> a simple solution to avoid this (without modifying [mini]wm3) is to > change the user units. > I think yade computation can be done with any system of units as they > are consistent. > For example, one can use centimeters instead of meters and deca- > Newtons instead of Newtons and so on. > But we must pay particular attention to the parameter values, eg. Kn > that was N/m becomes daN/cm. > That is exactly what JJ Moreau was doing for his very high-precision > computations on old apple. > I think that people that perform MD simulations (with atom-sized > particles) do the same.
Want repeat this one? http://www.cnn.com/TECH/space/9909/30/mars.metric/ Seriously, for myself I will never use anything else than basic SI units since it is very easy to do mistake. Dimensionless quantitites don't scale with units anyway (like strains or angles). I would prefer to fix that in Wm3 (or Wm4, for that matter) or switch to another lib -- but I didn't find anything quite suitable. Have a look at e.g. http://www.ohloh.net/tags/3d/math. And I still think that the tolerance value has nothing to do with precision. NUmber of decimal places is the same for 1e-20 and for 1e20. But the tolerance must scale with that, that is the only problem, as I see it. How anout making ZERO_TOLERANCE and let the user set it to some reasonable value according to the particle size, timestep, etc? Vaclav _______________________________________________ Mailing list: https://launchpad.net/~yade-dev Post to : [email protected] Unsubscribe : https://launchpad.net/~yade-dev More help : https://help.launchpad.net/ListHelp
