Sage Days 15 is next weekend!!

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William Stein

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May 13, 2009, 2:45:10 AM5/13/09

to 480-uw09, 583-uw09, cwitty, Robert Miller, Tom Boothby, Dan Shumow, Elliott Brossard, William Cauchois, Kari Christianson, Matthew Fix, Brett Nakashima, Trismi, Igor Tolkov, Alyson Deines, Joshua Kantor, Anusha Sekar, Craig Citro, Stephanie Vance, James Allen Morrow, Rekha Thomas, Jacob Lewis, Wenhan Wang, Sara Billey, Chris Swierczewski

Hello,

We'd like to invite you to participate in Sage Days 15, which will
take place May 16 - 22, 2009 at the University of Washington. Sage is
a free and open-source software package for symbolic, exact and
numerical mathematics. It aims to be a viable alternative to Maple,
Mathematica, Matlab, and Magma, and is not constrained by the
licenses used for similar commercial software. Sage development is
centered at the University of Washington, but includes developers and
volunteers from around the world.

The first day of the conference will include several introductory
talks, aimed at a wide audience. In particular, the talks in the
morning session will be aimed at teachers looking to use Sage in their
courses, as well as advanced undergraduates looking to learn more
about what Sage can do. There will also be several talks on May 17,
but oriented more towards Sage development and applications in
research areas. In particular, the focus during Sage Days 15 will be
on algebraic topology and number theory.

The atmosphere at Sage Days workshops is generally quite friendly and
open, and you are welcome to only attend the talks that interest you.
A full schedule is available at http://wiki.sagemath.org/days15. We
hope to see you there!

--
William Stein
Associate Professor of Mathematics
University of Washington
http://wstein.org

William Stein

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May 13, 2009, 9:06:32 PM5/13/09

to Matthew E Rutherford, 480-uw09

On Wed, May 13, 2009 at 5:35 PM, Matthew E Rutherford
<mer...@u.washington.edu> wrote:
> Professor Stein,
>
> I had a question regarding hw 6 for math 480. On problem 3 part 4 where it
> asks you: "Now imagine a "sliding window", i.e., the price series Pt ,Pt+1,
> ..., Pt+100 for each t. This is 100 trading days of IBM's stock. For each
> value of t, compute the mean and standard deviation of the 100 log
> differences. Does the mean and standard deviation stay fairly constant
> over time, or does it change a lot?"
>
> Does this mean that you want us to start on some day "t" relative to Jan 1,
> 1990 and plot the mean and standard deviation for the log differences for
> 100 days starting at day "t"?
>

Yes, excatly. But I want you to do this for many different choices of
t as well.