How does one extract record components from GAP records obtained from
libGAP?
E.g.
sage: libgap.InvariantQuadraticForm(libgap.GeneralOrthogonalGroup(1,4,9))
rec( matrix := [ [ 0*Z(3), Z(3)^0, 0*Z(3), 0*Z(3) ], [ 0*Z(3), 0*Z(3),
0*Z(3), 0*Z(3) ], [ 0*Z(3), 0*Z(3), Z(3)^0, 0*Z(3) ], [ 0*Z(3),
0*Z(3), 0*Z(3), Z(3)^0 ] ] )

but 
sage:
libgap.InvariantQuadraticForm(libgap.GeneralOrthogonalGroup(1,4,9)).matrix()
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call
last)
<ipython-input-38-e2bfcf88a5fc> in <module>()
----> 1
libgap.InvariantQuadraticForm(libgap.GeneralOrthogonalGroup(Integer(1),Integer(4),Integer(9))).matrix()

/usr/local/src/sage/mav/sage/local/lib/python2.7/site-packages/sage/libs/gap/element.so
in sage.libs.gap.element.GapElement.matrix
(sage/libs/gap/element.c:8887)()

ValueError: not a GAP matrix
sage: 

Thanks,
Dima


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