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2019 Aug 13
0
behaviour and documentation of qr.solve
...r.solve on the underdetermined system Ax=b with
b <- c(3,5,7)
and
A <- rbind(
c(1,1,1,1,1),
c(1,2,2,2,2),
c(1,2,3,3,3)
)
The system has infinitely many solutions. The minimal norm solution is x=c(1,0,2/3,2/3,2/3).
But qr.solve(A,b) yielded the solution x=(1,0,2,0,0) which is destinguished only by being sparse and I do not think qr.solve
tries to compute the sparsest solution. So what does qr.solve do in case of an underdetermined system?
It is not documented.
Then I tried to figure out what qr.coef, qr.resid, and qr.fitted do. I had to do actual experiments to figure out that it s...
2007 Aug 27
2
Is it possible to register without sending the password
Dear Philipp;
Kindly find the part of the configuration as below:
[general]
allow=all
disallow is comment by ( ; ).
[bilal_sip]
type=friend
context=internal
host=dynamic
canreinvite=no
dtmfmode=rfc2833
So where is the problem? The endpoint does not
register and nothing appear on trace level 3. And the
amazing thing that if the endpoint send wrong username
(for example: bilal_sip100) then it
2003 Dec 01
0
No subject
\\Pettit
Connect As:
Password:
On the server side, I didn't get far because the domain name come up NULL so
it failed on that test.
Below are two logs log98.txt and log2000.txt that show full debug info.
I might just have a stupid configuration or installation mistakes. I am sure
that my basic configuration must work since it is a very typical setup.
Any help will be highly appreciated