Thanks. Sandeep Murthy s.mur...@mykolab.com
> On 12 Feb 2015, at 23:42, Alexander Konovalov <al...@mcs.st-andrews.ac.uk> > wrote: > > Hi Sandeep, > > As it was already noted here, the cause of the problem is that one of > these two groups is a permutation group and the other - pc group. The > GAP manual has a section "Saving a Pc Group" which may help you: > > http://www.gap-system.org/Manuals/doc/ref/chap46.html#X85696AB9791DF047 > > - see GapInputPcGroup there. > > Also, for pc groups you may use the pair of functions CodePcGroup and > PcGroupCode, see them here: > > http://www.gap-system.org/Manuals/doc/ref/chap46.html#X8041C2D88721EEA9 > > These were invented to store large libraries of small groups, and for > really huge groups, they will may work slow. However, GapInputPcGroup > performs quite well - I've found the log file for a group of order 3^728 > which I was saving several years ago. The group was saved in 9 seconds > and restored in 12 seconds, and the file size was "only" 6.5 MB (gzipped > - 1.5 MB): > > gap> PrintTo( "save", GapInputPcGroup( V, "V729_13" ) ); > gap> time; > 9217 > gap> Read("save"); > #I A group of order > 2209395351413957253683909547381599161963288912918954731542644224734870827044293093746906\ > 7135836134418530028589701635375804525993982486739360716170312948236428294558462634156750\ > 2928525358477130679078983517688062896651637532904132693253013488158239242149787728540685\ > 561563573806847600207803782218928387605966850445847423444996735145737566710612948961 > has been defined. > #I It is called V729_13 > gap> time; > 12154 > gap> > > Hope this helps, > Alexander > > > > On 11 Feb 2015, at 14:05, Sandeep Murthy <s.mur...@mykolab.com> wrote: > >> Hi >> >> I am trying to use the IO_PickleToString() method from the SCSCP package >> to test out how GAP serialises group objects. This does not appear to be >> working as expected on the isomorphic groups Sym(3) and D_6 (dihedral group). >> >> gap> IO_PickleToString( SymmetricGroup( 3 ) ); >> "PRMGILIS\>2PERM\>7(1,2,3)PERM\>5(1,2)INTG\>16FAIL” >> >> This looks OK but for D_6 it fails: >> >> gap> IO_PickleToString( DihedralGroup( 6 ) ); >> Error, no method found! For debugging hints type ?Recovery from NoMethodFound >> Error, no 1st choice method found for `IO_Pickle' on 2 arguments called from >> IO_Pickle( s, obj ); called from >> <function "IO_PickleToString">( <arguments> ) >> called from read-eval loop at line 20 of *stdin* >> you can 'quit;' to quit to outer loop, or >> you can 'return;' to continue >> brk> >> >> Why is this? Both should return OpenMath strings. >> >> Sandeep >> _______________________________________________ >> Forum mailing list >> Forum@mail.gap-system.org >> http://mail.gap-system.org/mailman/listinfo/forum >
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