Dear Design Developers, Dear GAP-Forum, This message is to inform you of developments for a future release of the DESIGN Package for GAP.
The functionality is being improved to allow for more straightforward construction of block designs, such as those formed from group orbits of blocks, and derived and residual designs. Moreover, greater use of (new and old) theoretical knowledge is being used in the BlockDesigns function for more efficient discovery and classification of block designs with given properties. Also, the documentation is being upgraded. ONE WARNING: I plan to remove the undocumented option to BlockDesigns for it to compute only the resolvable and simple block designs with the given properties. This would be a useful option if it worked efficiently, but at present to compute resolvable designs (using the DESIGN package) it seems to be usually more efficient to compute all block designs with the given properties and then to filter out the resolvable ones. I'm sure it is possible to do better than this, but probably not with the current setup. If the "resolvable and simple" feature is essential to your work then I would be interested to hear about it, and might reconsider my decision to remove this cumbersome "feature". In due course I may try to write a more efficient implementation of an ability to produce only resolvable block designs with given properties. Regards, Leonard Soicher _______________________________________________ Forum mailing list [email protected] http://mail.gap-system.org/mailman/listinfo/forum
