Hi Nathann,

I'm trying to work on a better class hierarchy for designs in sage
right now actually. (Group divisible designs? _colored_ group
divisible designs? t-wise balanced designs? Any of the other
chapters/sections in the CRC? and why is the hadamard matricies/latin
squares code separated? )

As far as the design package, I found the code very readable and
approachable (with loop invariants commented even):

<gap_root>/pkg/design/lib/blockdesign.g

Also, on top of citing GAP, papers I read in the area use Discreta as
well  On the schedule for me later this summer is figuring out how to
wrap the functionality of it without all the GUI code.

http://www.mathe2.uni-bayreuth.de/discreta/

Anyway, if something like this is *already* broken by default, using
something like rob suggested from graph theory for groups the other
day is not a bad thing for designs:

d = designs.<tab>

On Fri, Jun 4, 2010 at 6:02 AM, Nathann Cohen <[email protected]> wrote:
> Which..... may be caused by the fact I don't even know about Gap's
> design package, which is required for this function  ^^;

>From sagenb.org in gap mode:

LoadPackage("Design");
        
fail

If you have not figured out already, a simple work around would be to
install the design package in the normal pkg folder in the gap
subfolder.

As design is one of the standard packages, I believe this is done in
sage by typing sage -i gap-packages, if not the site is here:

http://www.gap-system.org/Packages/design.html

Then doing

sage -gap
LoadPackage("Design");
?WittDesign

will show you Show you documentation for WittDesign.

>
> Nathann
>
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