similar to: Non linear programming optimization (which package to use?)

Dear R-experts, this is not a direct R-problem but I hope you can help me anyway. I would like to minimize || PG-I || over P, where P is a p x p permutation matrix (obtained by permuting the rows and/or columns of the identity matrix), G is a given p x p matrix with full rank and I the identity matrix. ||.|| is the frobenius norm. Does anyone know an algorithm to solve such a problem? And if

Hi, I have a complex-valued vector X in C^n. Given another complex-valued vector Y in C^n, I want to find a permutation of Y, say, Y*, that minimizes ||X - Y*||, the distance between X and Y*. Note that this problem can be trivially solved for "Real" vectors, since real numbers possess the ordering property. Complex numbers, however, do not possess this property. Hence the

For an application in image processing -- using R for statistical purposes -- I need to solve the following task: Given n (e.g. n = 100 or 200) points in the unit square, more or less randomly distributed. Find a rectangle of maximal area within the square that does not contain any of these points in its interior. If a, b are height and width of the rectangel, other constraints may have to be

Hello I was trying to estimate the weibull model using nls after putting OLS values as the initial inputs to NLS. I tried multiple times but still i m getting the same error of Error in nlsModel(formula, mf, start, wts) : singular gradient matrix at initial parameter estimates. The Program is as below > vel <- c(1,2,3,4,5,6,7,8,9,10,11,12,13,14) > df <- data.frame(conc, vel) >

I checked by Alpha this morning after it's been running fine for a while and saw this on the terminal (hand transposed): Jun 14 08:54:55 erwin getty[2087] : getty : retreiving gettytab entry 'default': Device not configured Jun 14 08:54:55 erwin getty[2087] : getty : retreiving gettytab entry 'Pc': Device not configured Jun 14 08:54:55 erwin getty[2087] : getty : retreiving

Hi all, Having a bit of a problem with portupgrade on a -STABLE machine: [root@erwin]/root: portupgrade -aRn ---> Session started at: Tue, 27 May 2003 22:54:00 +1000 closed stream ---> Session ended at: Tue, 27 May 2003 22:54:01 +1000 (consumed 00:00:01) [root@erwin]/root: pkgdb -F does the same thing. Any clues? cheers, Rob [root@erwin]/root: uname -a FreeBSD erwin.number6

Dear Philipp, I've compiled it from source on my raspberry pi, and replaced the binary from the synaptic package manager with the compiled one. Everyting is working fine now, it seems that there is indeed a "faulty" package in the repository. I don't know who I should contact to get this fixed? Anyway, it works, but while using ogg as output stream from mopidy, I get a delay of

I tried require ''url_writer'' but this is not the trick what should be required/included to test the routes urls ? thanks erwin -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this

Erwin: We found it''s not worth the time to do this. It won''t work reliably. You''re in for a world of hurt. We''ve given up on the idea after several months of trying (and some great feedback from this list). There are some on this list who claim to have gotten it to work, but that might just be luck. We''re now using Apache on a higher port, and using

Hi all I have a small issue I ma trying to solve (at least to understand..) I am testing an app on my remote_server (w Apache/Passenger) in a sub_URI, without any problem (I tested also the same app, locally w Apache too) in my environment.rb , I have initialized config.action_controller.relative_url_root = "/my_subURI" config.action_controller.asset_host =

Dear Wizards - Thank you so much for your help. That was exactly what I was looking for. Now, I have been working on conditional selection of columns in a data frame. My goal is to calculate the total revenue per sales representative per status in a table. I have come to a complete stop: Let's say, we have a data.frame called df with several columns and a number of rows: df <-

The linux builds are not using SSE right now, but the vector data is 16-byte aligned on all platforms. So if you port this SSE code to another platform (Linux, Altivec, NEON), you could contribute it back to Bullet? The most interesting SSE part is the innerloop of the constraint solver: http://tinyurl.com/ydoapct Some developers replaced some linear algebra functions (in Bullet/LinearMath) with

given an Arra tags[] I need to produce a resulting Hash as following .. { "$in" => [tags[0]], "$in" =>[tags[1], ...} in which the key should be always the same and the value being an Array I tried this : myHash = {} tags.each do |tag| h = {"$in" => [tag]} myHash.merge!(h) end but the merge! is only

Dear Philipp, Thanks for this fast answer. I'm using "Icecast 2.3.3-kh7-20130425090916", installed on a Raspberry Pi 3 using the cononical "sudo apt-get install". The output was copied from the log file in /var/log/icecast2/error.log. Kind regards, Erwin 2017-08-28 10:06 GMT+02:00 Philipp Schafft <lion at lion.leolix.org>: > Good morning, > > On Mon,

>library(RODBC) >ch<- odbcConnect("durga") > sqlQuery(ch, paste("SELECT * from emp")) >sqlQuery(ch, ("SELECT * from xyz")) store revenue year_y 1 bigbazar 787875 2008 2 more 87876 2008 plot(revenue ~ year_y, data=xyz, pch=16) can i get any diffrent types of graphs like pie charts, bar

sample report data that i want to forecast quarter quarter_index Revenue 2007 Q1 1 $3,856,799 2007 Q2 2 $4,243,328 2007 Q3 3 $4,930,369 2007 Q4 4 $5,443,579 2008 Q1 5 $5,164,830 2008 Q2 6 $5,104,413 2008 Q3 7

Hi All, I think I know the answer. However, I would like to confirm my understanding. Does openssh support the usage of ecc keys? Any plan for supporting ecc keys? Thanks, Erwin

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ============================================================================= FreeBSD-SA-04:10.cvs Security Advisory The FreeBSD Project Topic: CVS pserver protocol parser errors Category: contrib Module: contrib_cvs Announced:

Dear R Helpers, I have a list that contains a number of objects, each of them financial statement data from quantmod (although I don't think that knowledge of quantmod is necessary to help with this problem). > str(listfinobj) chr [1:4815] "A.f" "AA.f" "AACC.f" "AAME.f" "AAN.f" "AAON.f" "AAP.f" "AAPL.f"

I a using delayed_job, and I am raising an exception this way : config/initializers/custom_exceptions.rb class RemoteLockerException < StandardError; end class RemoteLockerDenied < StandardError; end lib/instruction_request_job.rb class InstructionRequestJob < Struct.new(:style, :request_id) def perform .... > connector =