Dear Forum please I need your response.. thanks FAWAD ALI On Fri, Jun 24, 2016 at 2:05 PM, <forum-requ...@gap-system.org> wrote:
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FAWAD ALI M.Phil (Pure Mathematics) 3rd semester scholar From > Pakistan, (Fawad Hayat) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Wed, 15 Jun 2016 22:21:52 -0700 > From: fatemeh moftakhar <f.k.moftak...@gmail.com> > To: fo...@gap-system.org > Subject: [GAP Forum] PartitionsSet > Message-ID: > < > caoekhnl7a2wftzvgifvu+4fcgpm-bgbeuy1urbtp_auaqee...@mail.gmail.com> > Content-Type: text/plain; charset=UTF-8 > > Dear GAP forum > > I need all partitions of {2,..,21}. I mean, I want to run > PartitionsSet([2..21]). I have servers with 512 gigabyte ram and my > computer stopped after two days, because it needs more ram. I don't have > better computer. Is there a faster algorithm? I need these partitions for > computing supercharacter theories of Janko group J2. > > > > Best regards > Fatemeh Moftakhar > > > > -- > Regards; > Miss Fatemeh Moftakhar > PhD Candidate, > Department of Pure Mathematics, > Faculty of Mathematical Sciences, > University of Kashan, Kashan, Iran > > > ------------------------------ > > Message: 2 > Date: Thu, 16 Jun 2016 09:19:01 +0200 > From: Thomas Breuer <s...@math.rwth-aachen.de> > To: fatemeh moftakhar <f.k.moftak...@gmail.com>, fo...@gap-system.org > Subject: Re: [GAP Forum] PartitionsSet > Message-ID: <20160616071900.ga15...@gemma.math.rwth-aachen.de> > Content-Type: text/plain; charset=us-ascii > > Dear GAP Forum, > > Fatemeh Moftakhar wrote > > > I need all partitions of {2,..,21}. I mean, I want to run > > PartitionsSet([2..21]). I have servers with 512 gigabyte ram and my > > computer stopped after two days, because it needs more ram. I don't have > > better computer. Is there a faster algorithm? I need these partitions for > > computing supercharacter theories of Janko group J2. > > If you really have to run over all these partitions then > this will take a lot of time. > Let us assume that you can process a million of them in a second, > which would be quite fast. > In one year (356 days with 24 hours) you can then process > the following number of partitions. > > gap> 10^6 * 3600 * 24 * 356; > 30758400000000 > gap> NrPartitionsSet( [ 2 .. 21 ] ); > 51724158235372 > > I would suggest to find criteria that allow you to exclude most of the > candidates without looking at them. > > All the best, > Thomas > > P.S.: > Even if you really have to look at each element from a large set > then keeping all of them in memory at the same time is probably > not necessary. > For such purposes, one can think about developing a so-called iterator > for the set. > This is essentially a function that knows which was the last element > you have looked at, and can can be called in order to give you the > next element. > Such functionality exists already in GAP for several kinds of sets, > for example for the set of partitions of a given number. > I am not aware of iterator functionality for the set of partitions > of a set, > but the above numbers show that this approach would not be suitable > in your situation. > > > > > ------------------------------ > > Message: 3 > Date: Thu, 16 Jun 2016 00:33:21 -0700 > From: fatemeh moftakhar <f.k.moftak...@gmail.com> > To: fo...@gap-system.org > Subject: [GAP Forum] ReadLine > Message-ID: > <CAOEkHN+9kuySFYmOBPDp5GHR+GhGNJ= > qw2pawjdhs9nud47...@mail.gmail.com> > Content-Type: text/plain; charset=UTF-8 > > Dear GAP forum > > Is there any way to read just a special line of a large file (that has too > much data). Would you please explain with a sample code? > > Best regards > Fatemeh Moftakhar > > -- > Regards; > Miss Fatemeh Moftakhar > PhD Candidate, > Department of Pure Mathematics, > Faculty of Mathematical Sciences, > University of Kashan, Kashan, Iran > > > ------------------------------ > > Message: 4 > Date: Fri, 17 Jun 2016 00:14:07 +0100 (BST) > From: "Stefan Kohl" <ste...@mcs.st-and.ac.uk> > To: "R.N. Tsai" <r_n_t...@yahoo.com> > Cc: GAP Forum <fo...@gap-system.org> > Subject: Re: [GAP Forum] saving variables to a file > Message-ID: <submission.1bdguc-0005l1...@mail-gap.mcs.st-and.ac.uk> > Content-Type: text/plain;charset=iso-8859-1 > > On Thu, June 16, 2016 12:35 am, R.N. Tsai wrote: > > This is actually perfect for GF(2) matrices (which is all I need for > now).Interestingly > > enough if I convert the GF(2) matrix to 1 and 0's (using "Int") the > bitmapfile is 24x > > larger... > > Yes -- if you take an integer matrix, you get a 24-bit color picture, > where the > entries of the matrix are read as 256^2 * red value + 256 * green value + > blue value. > > Stefan > > > From: Stefan Kohl <ste...@mcs.st-and.ac.uk> > > To: R.N. Tsai <r_n_t...@yahoo.com> > > Cc: Max Horn <m...@quendi.de>; GAP Forum <fo...@gap-system.org> > > Sent: Wednesday, June 15, 2016 1:51 PM > > Subject: Re: [GAP Forum] saving variables to a file > > > > On Tue, June 14, 2016 5:20 pm, R.N. Tsai wrote: > >> Thanks for the response Max,The matrices are over GF(2), so hopefully > they can be > >> managed more efficiently than generic matrices.R.N > > > > One thing you could do specifically for matrices over GF(2) is to save > them > > as monochrome bitmap pictures -- this uses just one bit per entry (plus > a tiny > > overhead for the description block for the picture): > > > > gap> M := NullMat(10000,10000,GF(2));; # just some GF(2) matrix, could > be any > > gap> file := Filename(DirectoryTemporary(),"matrix.bmp"); # pick a file > name > > "/tmp/tmIthaXA/matrix.bmp" > > gap> SaveAsBitmapPicture(M,file); # save the matrix to the file, 12.5 MB > in this case > > gap> time; > > 18392 > > gap> N := LoadBitmapPicture(file);; # read it in again > > gap> time; > > 8320 > > gap> N = M; > > true > > > > Hope this helps, > > > > ?? ?? Stefan > > > > > > > > > > > > > > > ------------------------------ > > Message: 5 > Date: Tue, 21 Jun 2016 08:38:55 +0000 > From: Leonard Soicher <l.h.soic...@qmul.ac.uk> > To: "fo...@gap-system.org" <fo...@gap-system.org> > Subject: [GAP Forum] Announcing the SLA package > Message-ID: > < > vi1pr07mb084605159c07db25a4faad388e...@vi1pr07mb0846.eurprd07.prod.outlook.com > > > > Content-Type: text/plain; charset="iso-8859-1" > > > Dear Forum Members, > > It is my pleasure to announce formally the official acceptance > of the SLA package. The officially accepted version 1.1 of SLA has > been publicly available in GAP starting with GAP version 4.8.2, > and I apologise for the lateness of this announcement. > > SLA provides functions for computing with various aspects of > the theory of simple Lie algebras in characteristic zero. > > The SLA package is authored by Willem de Graaf (University of Trento), > and on behalf of the GAP Council, I thank him for this contribution to GAP. > > Leonard Soicher > (Chair of the GAP Council) > > > > ------------------------------ > > Message: 6 > Date: Tue, 21 Jun 2016 09:25:56 +0000 > From: Leonard Soicher <l.h.soic...@qmul.ac.uk> > To: "fo...@gap-system.org" <fo...@gap-system.org> > Subject: [GAP Forum] Announcing the AutomGrp package > Message-ID: > < > vi1pr07mb0846f9df39864ebf0031d7498e...@vi1pr07mb0846.eurprd07.prod.outlook.com > > > > Content-Type: text/plain; charset="iso-8859-1" > > > Dear Forum Members, > > It is my pleasure to announce formally the official acceptance > of the AutomGrp package. The officially accepted version 1.3 of AutomGrp > is now available in the newly released GAP version 4.8.4. > > AutomGrp provides methods for computations with groups and semigroups > generated by finite automata or given by wreath recursion, as well as with > their > finitely generated subgroups and elements. > > The AutomGroup package is authored by Yevgen Muntyan (Tableau Software) > and Dmytro Savchuk (University of South Florida), and on behalf of the GAP > Council, > I thank them for this contribution to GAP. > > Leonard Soicher > (Chair of the GAP Council) > > > > > ------------------------------ > > Message: 7 > Date: Fri, 24 Jun 2016 05:05:38 -0400 > From: Fawad Hayat <fawadhaya...@gmail.com> > To: fo...@gap-system.org > Subject: [GAP Forum] FAWAD ALI M.Phil (Pure Mathematics) 3rd semester > scholar From Pakistan, > Message-ID: > <CAPf56+XPam8ZVUyXwNdsvDbLQgqWhYuL= > 2lyd21qwkmvsyw...@mail.gmail.com> > Content-Type: text/plain; charset=UTF-8 > > Hello sir, > sir I have a problem that how to write a command in GAP the automorphism > group of finite abelian group and their fixed points. > Let Z_pXZ_q be cyclic group where p & q are distinct primes, > Let suppose p=2 & q=3 > => G:=Z_2XZ_3= {(0,0),(0,1),(0,2),(1,0),(1,1),(1,2)} > be a cyclic group, and 'd' is the divisor of the order of a group G i.e ( > d/IGI =>d=1,2,3,6) > how to list all the automorphisms of a group Aut(G), and how to find > explicitly all those automorphisms fixing 'd' elements, where fix means > f(x)=x ; for some x belongs to G & for f belongs to Aut(G). > f(e)=e : by homomorphism property, > > i.e For d=1, > A={set of all those automorphisms of Aut(G) fixing d=1 element only ( > Identity element)} > For d=2, > B={set of all those automorphisms of Aut(G) fixing d=2 element} > For d=3 > C={set of all those automorphisms of Aut(G) fixing d=3 element} > For d=6 > D={ I : because identity is the only auto fixing all the elements of a > group G } > > Sir, I need The command which gives me the complete calculation from GAP > Thanks Sir, > Regards FAWAD ALI From pakistan > > > ------------------------------ > > _______________________________________________ > Forum mailing list > Forum@mail.gap-system.org > http://mail.gap-system.org/mailman/listinfo/forum > > > End of Forum Digest, Vol 151, Issue 3 > ************************************* > _______________________________________________ Forum mailing list Forum@mail.gap-system.org http://mail.gap-system.org/mailman/listinfo/forum
