similar to: glm step() fkt

I have a data.table with dimensions 100 by 10^7. When I do trainIndex <- caret::createDataPartition( df$status, p = .9, list = FALSE, times = 1 ) outerTrain <- df[trainIndex] outerTest <- df[-trainIndex] Subsetting the rows of df takes over 20 minutes. What is the best way to efficiently subset this? Thanks! [[alternative

Hello at all, working with a dataset I try to optimize a non-linear function with constraint. test<-read.csv2("C:/Users/Herb/Desktop/Opti/NORM.csv") fkt<- function(x){ a<-c(0) s<-c(0) #Minimizing square error for(j in 1:107){ s<-(test[j,2] - (x[1] * test[j,3]) - (x[2] * test[j,4]) - (x[3]*test[j,5]) - (x[4]*test[j,6]) - (x[5]*test[j,7]))^2 a<- a+s} a<-as.double(a)

Hi, I am having trouble using constrOptim. My target is to do a portfolio optimization and there some constraints have to be fulfilled. 1) The weight of each share of the portfolio has to be greater than 0 2) The sum of these weights has to be 1 I am able to fulfill either the first or the second constraint but not both. One simple way would be to fulfill the first constraint by using optim as

I am having a problem with ruby''s sort_by function. I want to sort a list of parent model objects based on the children of the parent models. Normally you might say sortedList = modelList.sort_by { |model| model[''someAttribute''] } What I am tring to do is sortedList = modelList.sort_by{ |model| model.children.find(:first, order=>"price desc" ).price}

Oh, there are ways, but the constraining issue here is moving data (memory bandwidth), and data table is probably already the fastest mechanism for doing that. If you have a computer with four or more real cores you can try setting up a subset of the columns in each task and cbind the results afterward, but it will be hard to accomplish without making extra copies of the data. You are already

Dear Sir, I got a problem with my program. I would like to classify my data using bagging support vector machine ensemble. I split my data into training data and test data. For a given data sets TR(X), K replicated training data sets are first randomly generated by bootstrapping technique with replacement. Next, Support Vector Mechine (SVM) is applied for each bootstrap data sets. Finally, the

Hello, in marketing-science field i do some clusteranalysis and get the experience that the scale cause the results dramatic! What recommendation can somebody give me, when i use nominal-variables(recode to 0/1 variables) with 6 point ordinal-variables. Is it better toDo a z-transformation with the ordinal variables , or should i recode this values in 0/1 binaries, too! P.S. Which is a good

Hi volks, i want to ask if the "fs_acl_xattr" and "vfs_acl_tdb" in samba 3.3 are now "stable" or if its planned to be stable in 3.4 What is the experience with this vfs modules in 3.3 ? Bye, Andy

On Wed, 5 Feb 2020, Phil Pennock wrote: > On 2020-02-06 at 10:29 +1100, Damien Miller wrote: > > * sshd(8): allow the UpdateHostKeys feature to function when > > multiple known_hosts files are in use. When updating host keys, > > ssh will now search subsequent known_hosts files, but will add > > updated host keys to the first specified file only. bz2738 >

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EASTMEDIA GROUP TO OFFER RUBY ON RAILS TRAINING COURSES IN NEW YORK CITY AND LONDON EastMedia Group, New York City?s premier Rails shop, is now offering two separate training courses on Ruby and Ruby and Rails. On April 29, EastMedia will offer a one-day training course in New York, to be taught by Francis Hwang and Matt Pelletier. On May 5 through 7, Smartlab/Volks Lab and EastMedia

Hi folks, i have some problems with my evaluation. We have collect tons of data from 23 testpersons for our new road study. I have now a time series for each person and all the logs when he accelerates or hits the break trying to solve five different tasks. The dataset lools like: # Unixtime time accelerate break UserID task #10372 1312358742