Where communities thrive


  • Join over 1.5M+ people
  • Join over 100K+ communities
  • Free without limits
  • Create your own community
People
Repo info
Activity
    Aly
    @adeines
    Hi. This is pretty cool.
    William Stein
    @williamstein
    Hi,
    Wow, this thing works. I can edit the past :-)
    Aly
    @adeines
    Indeed!
    William Stein
    @williamstein
    Not well enough: $x^3$
    Aly
    @adeines
    oh. nope.
    Aly
    @adeines
    I think it looks good.
    Thanks for showing me, I can use this as set up to my talk.
    Aly
    @adeines
    Is this your talk #1 or #2?
    William Stein
    @williamstein
    Talk #1
    William Stein
    @williamstein
    hey!
    where's your slides?
    William Stein
    @williamstein
    Here's what I was going to talk about at 2pm. But canceled now. https://cloud.sagemath.com/projects/f156fc0b-950d-4e09-b9fb-1f5ab0cc888c/files/wstein/fgp.sagews
    Aly
    @adeines
    This is nice.
    William Stein
    @williamstein
    adeines -- it's a good thing you wrapped nfhnf. I was stumped for a while about how to even try that function in pari...
    it's all links to sage stuff.
    the actual online pari docs don't define their "two matrices" format but link to a broken reference, which I can't find online.
    Aly
    @adeines
    Yep. :P
    Aly
    @adeines
    My talk is now in my folder: /adeines
    William Stein
    @williamstein
    ugh
    Marc
    @mmasdeu
    Hi, does anyone know where the list of functionality from John's blackboards was copied?
    William Stein
    @williamstein
    I don't know if it is online. I only saw somebody using a pencil and paper...
    And of course I have a picture.
    I just sent you my picture... should get it in a miute.
    Marc
    @mmasdeu
    thanks!
    michaelneururer
    @michaelneururer
    I also have it written down if anybody is interested
    Marc
    @mmasdeu
    It's now in the cloud...
    William Stein
    @williamstein
    mmasdeu -- look at sage: a.__invert__?? where a is a matrix over ZZ. Then all is clear.
    it seems like the sign got switched?
    Marc
    @mmasdeu
    ok
    oh the invert method returns a denominator, which i should multiply (i was hoping it would always be positive)
    William Stein
    @williamstein
    also, if you look at a.__invert__?? you'll see how it works -- it makes the matrix over a field, then inverts that. (A big waste of memory actually)
    ah
    Marc
    @mmasdeu
    you mean that it should be changed?
    flint's invert allows aliasing
    (disregard last line --although it's true)
    William Stein
    @williamstein
    It would save memory (not much time) to not construct a copy of a over QQ just to invert and make yet another matrix. But I don't think you should do that as part of this ticket -- it's something for another ticket.
    Marc
    @mmasdeu
    Inversion works now (i fixed the sign issue)
    William Stein
    @williamstein
    ok, checking now.
    this still fails: ./sage -t src/sage/matrix/matrix_integer_dense.pyx
    Marc
    @mmasdeu
    oops i changed the sign of the "denominator", not that of the matrix, apparently
    William Stein
    @williamstein
    I'm back in Seattle, I just filled out my reimbursement request form, and I woke up 9am Copenhagen time (i.e., midnight Seattle time) ready to go. total jetlag.
    Harald Schilly
    @haraldschilly
    being the first time tired while the others wake up at around 8 is my usual experience. good luck getting in sync again ;-)