
Mon Dec. 2, 2019  YS
As I mentioned in class this morning,
I will be away from Tuesday to the end of this week, to attend a conference.
So Tuesday's office hours is cancelled. The exam will be handled by Jack.
Sorry for any inconvenience this may cause.

Nov 28, 2019. YS
Regarding Exam~3: As a review on Monday I will go over
some of the question of the sample examples that are posted but not all. I am posting solutions in case you want
to use these for reviewing.

Nov 16, 2019. YS
Regarding HW5: I
am getting questions regarding Question~1 of HW5. Recall that
Householder gives you Projectors P1, P2, ... Pn such that A = P1
P2 ... Pn R. The matrices P1, P2, are not explicitly stored 
instead the script [A, bet]=HoQR(A) outputs a matrix that
contains the v_i's (below the main diagonal of output A) and the
beta_i's. You need the first n columns of P1 P2 ... Pn. You
obtain this by applying P1 P2 ... Pn to the matrix Z = eye(m,n)
= matrix of columns e1 e2 ... en. This will extract the first n
columns of P1 P2 .. Pn as needed. Note that you will have to
apply this in the order n, n1, ,,, 1 !! (for k=n:1:1 ...), so
Q = P1 (P2 ( ... (Pn Z))) and R = triu(A(1:n,1:n)). The only
thing left is to figure out how to apply Pj to a matrix (the
matrix Z)... Again do not explicitly compute Pi which is an mxm
matrix (this is computationally expensive). We saw in class how
to unpack the vector vk and then apply Pk = I  bet(k) vk vk' to
a vector. You can do the same thing for matrices..

Nov 13, 2019. YS
The following graph shows how everyone is doing so far in the class.
[every student is represented by a small circle.]

Nov 13, 2019. YS
Here are the stats for HW4:
mean 78.42 * mean without zeros 92.50
median 92.00 * median without zeros 94.00
max 100.00 * min without zeros 61.50
Number of As and As: 28

Nov 13, 2019. YS
Here are the stats for Exam~2:
mean 78.76 * mean without zeros 88.37
median 88.50 * median without zeros 90.00
max 102.00 * min without zeros 60.00

NovO4 31, 2019. YS
Clarifications for
HW4.
I have had a number of requests for clarifications for question
2.b. Specifically a few of you asked what is meant by
orthogonality conditions. As was explained in class  see
also the illustration in Page 78 (of set 7)  x* is solution
of min  b  Fx_2 if and only if b  F x* is orthogonal to
the span of F. This is what is meant by the orthogonality condition.
(The orthogonality condition leads to the normal equations.)
In this particular question the hint essentially gives out the
answer.. You just need to write that b  Ax is orthogonal to e and
get some equation on the component xi which you then substitute.
This will get rid of xi. ..

Oct 31, 2019. YS
PLEASE NOTE:
The data posted for
HW4 question 2 (called 'dat4QR') has been reposted  the previous one
will cause a problem with cholR.. [reposted Oct.31, at ~9:00am
and again
at ~3:00pm ]

Oct 23, 2019. YS
Change in office hours: Please note that I have to
push my Monday hour up to 2:30pm (from 1:00pm) due to a
department committee assignment.
The Tuesday office hour remains the same.
The new schedule is posted in the class website.

Oct 8, 2019. YS
The first exam (MT1) has been graded. Here are the stats (base is 100):
mean 80.28 * mean without zeros 87.93
median 90.00 * median without zeros 91.50
max 100.00 * min without zeros 58.00

Oct 8, 2019. YS
I have not yet posted
the stats for HW1 Here they are:
mean 79.09 * mean without zeros 90.95
median 92.00 * median without zeros 94.00
max 100.00 * min without zeros 72.00

Oct 2, 2019. YS
Please note: Question 6 of HW2 has been postponed to HW3. It was replaced by a smaller problem left over from last time on nuclear norms.

Sep. 30, 2019. YS
HW2 has been posted. Please note: For those who typeset their work with latex (or other word processors), you have the
option of submitting your Homework by uploading it to Canvas. [PDF format please]

Sep. 19, 2019. YS
There were questions on how to submit the homeworks. Please submit them in class.
[beginning of class. Please do not interrupt lecture!]
Handwritten ones are fine  as long as they are readable.

Sep. 18, 2019. YS
As I did not get to cover the Schatten norms in my last lecture,
please ignore question 9c of the Homework. I will have the same question
(or a similar one) in HW2.

Sep. 11, 2019. YS
Due to popular demand,
I am starting to post solutions to the some of the
exercises listed in the lecture notes. Look for
``Supplement ..." in the lectures notes pages.
These may sometimes contain additional material such as
clarifications, proofs, etc.

Sep. 9, 2019. YS
I will be away Wednesday next week and so Jack (the TA)
will be substituting for me for my lecture
of Wednesday 18th. I will miss
both office hours of next week. In order to make up for part of
these, I will hold an extra office hour at the end of this week  namely Friday
at 1:00pm [Need to leave at 2:00pm sharp.] Sorry if this causes any issues. I will also
be available for a short while after lecture on Monday (16th)  feel free to drop by
my office if you have any questions.

Aug. 15, 2019. YS
Welcome to csci5304.
Please note:
 All material related to the class will be posted in the
cse instructional webpage except for legally protected items
[essentially grades] which will be under canvas.
 Streaming video archives of class meetings are available to
students registered in the oncampus section of this course on a
TENDAY delay for the length of the semester. This tenday delay is
lifted one week prior scheduled exams. Access these videos through
the UNITE Media Portal with your University of Minnesota Internet
I.D. and password (this is what you use to access your University of
Minnesota email account, OneStop, etc.). DO NOT ask the instructor or
teaching assistants for technical or troubleshooting assistance with
these streaming video archives use the UNITE Troubleshooting FAQ
or `Submit a Trouble Report to UNITE' link found on all pages within
the UNITE Media Portal. Technical FAQ:
http://www.unite.umn.edu/streamingvideopodcasts/faq.html UNITE Media
Portal: https://www.unite.umn.edu.