Re: [sage-support] Echelon Form
2011/7/19 Santanu Sarkar : > Size of the matrix is (30,16). Entries are at least 3000 bit integer. Try using pastebin.com. -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] Re: Lattice Reduction of two matrix
Some matrix procedures also have an option which gives you the transformation matrix. sage: M=MatrixSpace(ZZ,4,4) sage: A=M.random_element() sage: A.echelon_form(transformation=True) ( [ 101 3032] [ 85 31 4847] [ 011 2176] [ 61 22 3475] [ 002 5636] [ 158 57 899 13] [ 000 9095], [ 255 92 1452 21] ) So an efficient way would be just to multiply with that matrix. Currently there is sadly enough no such option for LLL reduction so you have to find an explicit base change yourself. -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
Re: [sage-support] How Maxima is called from Python ?
Thanks a lot for this informations. Christophe. -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
Re: [sage-support] Echelon Form
Size of the matrix is (30,16). Entries are at least 3000 bit integer. On 17 July 2011 19:21, William Stein wrote: > On Thu, Jul 14, 2011 at 11:26 PM, Santanu Sarkar > wrote: > > I want to find Echelon Form using following: > > E,U=M3.echelon_form(transformation=True) > > > > But it terminates with the following message: > > > > *** the PARI stack overflows ! > > current stack size: 1600 (15.259 Mbytes) > > [hint] you can increase GP stack with allocatemem() > > > > Traceback (click to the left of this block for traceback) > > ... > > RuntimeError. > > > > > > Similar problem for Hermite Normal Form > > Post the *exact* input that replicates this problem. > > William > > > > > > > > > -- > > To post to this group, send email to sage-support@googlegroups.com > > To unsubscribe from this group, send email to > > sage-support+unsubscr...@googlegroups.com > > For more options, visit this group at > > http://groups.google.com/group/sage-support > > URL: http://www.sagemath.org > > > > > > -- > William Stein > Professor of Mathematics > University of Washington > http://wstein.org > > -- > To post to this group, send email to sage-support@googlegroups.com > To unsubscribe from this group, send email to > sage-support+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/sage-support > URL: http://www.sagemath.org > -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
Re: [sage-support] How Maxima is called from Python ?
On Tue, Jul 19, 2011 at 8:00 AM, Christophe BAL wrote: > Hello, > I would like to know how Sage calls Maxima from Python ? Which files have I > to look for in the source ? Sage (as of 4.7) uses pexpect to communicate with Maxima. The main places you'll want to look are in $SAGE_ROOT/devel/sage/sage/interfaces/maxima.py and $SAGE_ROOT/devel/sage/sage/interfaces/expect.py . In an 4.7.1, Sage will use ECL to use Maxima as "library" for it's internal use of Maxima. See http://trac.sagemath.org/sage_trac/ticket/7377 for more information on this. --Mike -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] How Maxima is called from Python ?
Hello, I would like to know how Sage calls Maxima from Python ? Which files have I to look for in the source ? Best regards. Christophe -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
Re: [sage-support] Re: How to calculate the affine coordinats of a point
that sounds comprehensibly. explains some more errormessages i got a few times (like 'bool has no attribute len' when using solve) greatz Am 18.07.2011 16:54, schrieb luisfe: > For me it looks like: > > In solve, when writting a == b you assume that a and b are expressions > involving several variables. If a and b are expressions, then a == b > is also an expression. > > However, p and x*p1+y*p2 are NOT expressions, but vectors. And > equality of vectors is not the same as equality of expressions > > sage: x == y > x == y > sage: type(_) > > sage: vector([x]) == vector([y]) > False > sage: type(_) > > > So, in fact, you are passing the following command: > > sage: [x * p1 + y * p2 == p] > [False] > > sage: solve([False],x,y) > > Which has no solution. It is subtle, but I would not consider it a > bug. If you really want to use solve, you may try the following: > > sage: solve(x * p1 + y * p2 - p,x,y) > [[x == (1/4), y == (3/4)]] > > In this case, the input is a vector, that is an iterable, so solve > extracts its components and equals them to zero. > > Being said that, I recommend you to use the linear algebra > interpretation that I suggested, since it will probably be much more > efficient. > -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
