[GAP Forum] How to obtain the incidence matrix of a partial geometry?
Felix Goldberg
felix.goldberg at gmail.com
Wed Jan 21 12:33:07 GMT 2015
Hello all,
I am running the code in the example in Section 9.2 of the GRAPE manual (
http://www.maths.qmul.ac.uk/~leonard/grape/manual/CHAP009.htm) , which
generates the Haemers partial geometry pg(4,17,2).
All works well but I cannot understand where exactly the incidence matrix
is stored and how to access it. The manual (referred to above) says that
there is a *delta* associated to the geometry output by the function
PartialLinearSpaces
but I can't find it.
I tried to run RecNames on the output (the variable called *haemers*) and
got this:
[ "names", "group", "order", "representatives", "isSimple", "isGraph",
"schreierVector", "adjacencies" ]
No sign of *delta* and apparently no incidence matrix.
Any help will be greatly appreciated.
Thanks,
Felix
--
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Felix Goldberg, Ph. D.
www.technion.ac.il/~felixg <http://www.technion.ac.il/%7Efelixg>
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