2:25 PM
Mike May: Checking to see if you are ready to enter the chat
Lynne Doty has joined this chat.
Russell Blyth: hi
Parviz Khalili: hello
Michael Siddoway has joined this chat.
Steve Prothero has joined this chat.
Steve Prothero: Steve here
David Huckaby has joined this chat.
Leah Wrenn Berman: Are you expecting there to be audio on the 
quicktime?
Daniel Shown has joined this chat.
Russell Blyth: yes - we are checking here
Hugh Sanders: No audio
Russell Blyth: audio was solved - not sure what is up
Dorothy Zeiser has left this chat.
Russell Blyth: sound is back
2:30 PM
Daniel Shown: qt:rtsp://165.134.240.35/LA050628pm1.sdp
Mike May: Any Questions?
Regina Souza: is the sound supposed to be working?
Mike May: There is a third homework up
Mike May: Sound is suppoded to be working
Leah Wrenn Berman: try restarting your QT stream, if you haven't 
already
Mike May: Worksheets for tomorrow morning are out and on the web
Lynne Doty: I have my volume settings maxed; can you increase yours at all?
David Huckaby: No audio here, either. (I restarted the stream and still no 
sound.)
John Boncek has joined this chat.
Mike May: Russell is going over the latest homework
Mike May: Any questions based on that?
2:35 PM
John Boncek: Thanks -- I tried to run it, but it was an .hqx file (for the mac?)
Mike May: We will come back to your homework later today.
Mike May: Is anyone still having audio problems?
John Boncek: no audio yet here
Steve Prothero: I've got audio, but I've had to crank the volume to the max.
David Huckaby: No audio here. Daniele is working on it.
John Boncek: very low volume
Hugh Sanders: My volume is OK.
Steve Prothero: Maybe just move the mike closer...
Steve Prothero: That's much better
Lynne Doty: yes much better
Hugh Sanders: OK that is louder.
Regina Souza: I really would like to be able to past something that is typed on 
the worksheet in text and past it as Maple input - is it a bug that this is not 
possible?
2:40 PM
Joyce Quella: head phones improve the sound a lot
Leah Wrenn Berman: or, alternately, would it make sense to define 
the matrices A and B in the exercise as 2-D input so Maple knows 
about them?
Regina Souza: What does 2-D input mean? (Leah)
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Leah Wrenn Berman: Regina, it's an input method where your input 
looks like the way Maple outputs stuff
2:45 PM
Leah Wrenn Berman: E.g., if you enter a matrix in 2D Input you get 
a matrix with boxes to fill in
Dorothy Zeiser has joined this chat.
David Huckaby has joined this chat.
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Regina Souza: Thanks, Leah - I will try
Michael Siddoway has joined this chat.
Leah Wrenn Berman: there's a toggle in the upper left to go between 
maple input and 2d input
2:50 PM
Mike May: video down briefly
Mike May: pm2
Mike May: up
Christian Hellings: You can't predict what the variables will be, can we?
Mike May: We can always use Leah's idea of naming the variables in advance
Leah Wrenn Berman: e.g., LinearSolve(MatOfVec,B, free=`t`)
Christian Hellings: Thanks. That's nice.
3:00 PM
Dorothy Zeiser has left this chat.
Harry Mills: Showing exp(x), sinh(x), and cosh(x) are dependent reminds me 
of the fact that if you have two colors of socks...
Harry Mills: The minimum number of socks you pick in order to guarantee a 
match is 3.
Dorothy Zeiser has joined this chat.
John Boncek: Encourage them to take Numerical Analysis. 
3:05 PM
Leah Wrenn Berman: Works pretty well to just set the range instead 
of plotting y=x, also
Mike May: right
Regina Souza: wouldn't be easier to give then the formulas for sinh x and 
cosh x?
Mike May: Sure, if they have forgotten the definitions, that explains the 
dependence after they have seen it graphically
John Boncek: regina: my students would've seen those formulas in Calc II, but 
I'd guess only one or two would remember them.
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Parviz Khalili has joined this chat.
Regina Souza: I like the idea of `seeing' if first graphically - but I would feel 
better to give them the formula after the `experimental stage'
Parviz Khalili: I have lost both VNC and QT
Mike May: yes
Mike May: PK - restart both - you may have had a network blip
Regina Souza: I like the way you are doing it!
Parviz Khalili: I am fine
3:10 PM
Regina Souza: perfect!
3:15 PM
Mike May: video out
Mike May: it will be pm3 on my mark
Mike May: we're up
Regina Souza: Can you `factor out' the variables automatically and display the 
null space as the span of the basis of the null space?
Regina Souza: That's the way I do it "by hand"
Regina Souza: I guess we could cheat at this stage
Mike May: 
Regina Souza: and display the linear combination
3:25 PM
Leah Wrenn Berman: the command Inverse seems actually to be 
broken!
Leah Wrenn Berman: that's kind of frustrating...
Regina Souza: do you introduce right then the problem of existence of 
inverses?
Mike May: Try MatrixInverse
Leah Wrenn Berman: yep, that works---thinks
Leah Wrenn Berman: thanks
3:30 PM
Mike May: any questions?
Leah Wrenn Berman: Do you know how the RandomMatrix function 
works? Because I got the same random matrix you guys did...
Leah Wrenn Berman: which seems a little weird
Leah Wrenn Berman: Won't this mean that all the students will get 
the same random matrix, though?
Leah Wrenn Berman: thanks
3:35 PM
Harry Mills: Dumb question: Why's my Maple input always italicized?
Leah Wrenn Berman: are you using 2d input instead of maple input?
Harry Mills: The 2D input seems to be the default. I can always fish for the 
correct format. Just wanted to know if there were a quick default.
Leah Wrenn Berman: you can change that (globally, if you wish!) in 
the preferences
3:40 PM
Mike May: video off, going to pm4
Russell Blyth: we're back
Russell Blyth: all OK?
Leah Wrenn Berman: you're back, but sound's cutting in and out...
Leah Wrenn Berman: but maybe it'll fix itself
Lynne Doty: try closing QT and restarting it--that's worked for me
Mike May: Time for people to suggest things they want to see in worksheets.
Mike May: We are getting ready to break you into small groups and start group 
projects.
Regina Souza: visualization of linear dependence, linear independence, span
Leah Wrenn Berman: maybe markov chains?
Leah Wrenn Berman: or determinants?
Christian Hellings: I like the Markov Chain idea. I use that application in 
class.
Leah Wrenn Berman: yes, two separate topics
Harry Mills: We talked about adding harpoon originals to the display of linear 
combos.
Lynne Doty: Markov chains--as in visualizing movement to a stable state?
Hugh Sanders: This fall I am teaching Calculus III and the first chapter is 
vectors in 3-space. I would like to make a worksheet for work in this chapter.
Regina Souza: Least squares
Regina Souza: Gram-Schmidt
3:45 PM
Parviz Khalili: I like the least square too.
Michael Siddoway: Matrix manipulation of 2D or 3D objects
Marius Buliga: tutorial on lu decomposition.(make a procedure that shows all 
the steps in the LU decomposition).
Christian Hellings: I attempted a maple worksheet two semesters ago 
concerning generating fractal images by randomly choosing one of three linear 
transformations iteratively, but I never completed it.
Harry Mills: Re: Gram-Schmidt - To display the orthogonal projections of 
succeeding vectors.
Steve Prothero: I want to create a worksheet to demonstrate the sensitivity to 
small changes in coef in the solution
David Huckaby: A vector in the domain has a component in null(A) and a 
component in Row(A). All vectors with equal Row(A) components are sent by A 
to the same vector.
Harry Mills: Color-matching points to their images under a linear operator.
Derrick Head: I may prepare a notebook about linear algebra topics for my 
ODE class. for instance, I may introduce matrix exponentials, fundamental 
matrices, and systems of first order linear systems via a Maple lab worksheet.
Harry Mills: Connecting points in pre-image to their images under a 
transformation, perhaps with line segments in 2- or 3-space.
Michael Siddoway: Cayley-Hamilton Theorem
Joyce Quella: I liked the exercises in the Lay book a lot. I will look through it 
tonight for some ideas of things to visualize.
Mike May: Which chat do you want to be brought into?
John Boncek: My audio is in-and-out: Least squares and/or Gram Schmidt 
sound would be fine with me
Hugh Sanders: R3
Michael Siddoway has left this chat.
Dennis Keeler: determinants
Christian Hellings: I'd like to be invited to the Markov Chain chat.
Joyce Quella: linear independence
Tepper Gill has joined this chat.
Tepper Gill: thanks
3:50 PM
Mike May: Let's start with least squares, who wants in?
Lynne Doty: could you abbrev the chat groups in the main chat--I can't see 
them on your screen VNC
Steve Prothero: Count me in on LS
Parviz Khalili: I like to be onthe least squrae
John Boncek: Least squares is good for me
Lynne Doty: that's good
Tepper Gill: what is the url
Hugh Sanders: I do have a course that I sometimes teach that involves least 
squares.
Leah Wrenn Berman: QT:rtsp://165.134.240.35:80/LA050628pm4.sdp
Steve Prothero: I got the invitation, but the name is just a number -- which 
one is it?
John Boncek: oops...need to be re-invited.
John Boncek: too many tabs to keep track of!
Derrick Head: David Thomas (det10013) has an office visitor and will 
probably not return before we end. I'll talk to him about a possible joint topic with 
him.
Leah Wrenn Berman: markov chains?
Dennis Keeler: determinants
Christian Hellings: i'm in for markov
Tepper Gill: I will go with least squares
Mike May: Who else for markov
Lynne Doty: I'd like Markov
Derrick Head: I'll join the chat for determinants for now
3:55 PM
Marius Buliga: i could go for gramm-scmidt.
Mike May: Any other gram schmidt?
Mike May: Who is not in a room yet?
John Boncek: <-- needs a re-invitation to LS
Tepper Gill: i can go to gs as i am not yet in ls
Joyce Quella: Icould do gram schmidt
Harry Mills: Perhaps it's more efficient to scan today's transcript for people's 
pref. I'm interested in new/modified visuals in R2 and R3
Regina Souza: could you help us organize the group and leave the chat to be 
initialized by each group?
4:00 PM
Russell Blyth: DK - are you in a chat?
Dennis Keeler: I closed that chat because Mike opened a new one with 
Derrick.
Dennis Keeler: Yes, I'm in a chat with Derrick.
Russell Blyth: OK
Dorothy Zeiser: I'd like to join R2 R3
David Thomas has left this chat.
Harry Mills: I'm chatting with Regina about $3
Harry Mills: R3
Harry Mills: Regina's got it all scoped.
Russell Blyth: hasgcsu
Regina Souza: i invited `dzizermath' for the conversation
Russell Blyth: dzeisermath
Regina Souza: thanks
Harry Mills: Hugh's handle?
Russell Blyth: hasgcsu
Mike May: Does anyone still need to invited into a chat?
John Boncek: Me
Hugh Sanders: That's correct
John Boncek: least squares
John Boncek: no, i inadvertently declined the request
Steve Prothero: Sound gone--leaving room
Steve Prothero has left this chat.
Russell Blyth: OK all - we will see you tomorrow - continue chatting as you 
wish
David Huckaby has left this chat.
Harry Mills: *bye*
4:05 PM
Dennis Keeler: thanks.
Hugh Sanders: Thanks
Russell Blyth: bye
Russell Blyth: vnc going
Hugh Sanders: Bye
Harry Mills: *bye*
Parviz Khalili has left this chat.
Derrick Head has left this chat.
Hugh Sanders has left this chat.
John Boncek: good afternoon, all. thanks russell and mike
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