similar to: question: ragged array

Hi All, I'm wanting to convert a ragged list of values into a structured matrix for further analysis later on, i have a solution to this problem (below) but i'm dealing with datasets upto 1GB in size, (i have 24GB of memory so can load it) but it takes a LONG time to run the code on a large dataset. I was wondering if anyone had any tips or tricks that may make this run faster? Below is

How can I add an extra column containing the rank to a ragged array indexed by more than one grouping factors? E.g. with the barley dataset: How can I to add an additional column ``rank'' containing the rank of the ``yield'' of the different varieties in relation to the indices ``year'' and ``site'' to the barley dataframe? I achieved to calculate the ranks with:

Hi, I have a list made up of character strings with each item a different length (each item is between 1and 6 strings long). Is there a way to convert a "ragged" list to a matrix such that each item is its own row? Here is a simple example: a=list(); a[[1]] = c("a", "b", "c"); a[[2]] = c("d", "e"); a[[3]] = c("f",

I have a dataset that looks like: set.seed(144) sam<-sample(1000,100) dat<-data.frame(id=letters[1:10],value=rnorm(1000),day=c(rep(1,100),rep(2,100),rep(3,100),rep(4,100),rep(5,100))) I want to "normalise" it using the following function (unless you have a better idea...): adj.values<-function(dframe){ value_mean<-mean(dframe$value) value_sd<-sd(dframe$value)

Can anyone please suggest how I can print: a <- matrix(c( "Heading 1", "This is some info\nabout heading 1", "Heading 2", "This is some info\nabout heading 2", ), byrow=T, nrow=2) to look like: Heading 1 This is some info about heading 1 Heading 2 This is some info about heading 2 (if you're not using a fixed width

I wonder what's the right way in R to do the following -- placing objects of the same kind together in subarrays of varying length. Here's what I mean: > word <- c("a","b","c","d","e","f","g","h","i","j") > kind <- c(1,1,1,2,3,4,5,5,7,7) > d <-

Dear R users, I am currently writing a MCMC algorithm for spatial Poisson model. One problem which I need to solve is as follows: I have a vector X[1:J] which describes characteristics of cells of a rectangular grid. Further, for each cell I have a list of adjascent cells adj[] and the vector listing numbed of adjascent cells num[]. Thus if I want to list cells adjascent to cell i I write

Hi and thanks in advance, I am fairly new with R so I hope this problem isn't too amateur. I have a vector of count data which correspond to vectors of date (%m/%d/%Y) and time of day (%H:%M:%S). I am trying to compute various statistics (e.g. daily max) by lumping the data together by day. I have been able to utilize tapply() and group the counts together, but with the method I use I end

Hello, I'm running an algorithm for graph structural cohesion that requires a depth-first search of subgraphs of a rather large network. The algorithm will necessarily be redundant in the subgraphs it recurses to, so to speed up the process I implemented a check at each subgraph to see if it's been searched already. This algorithm is very slow, and takes days to complete on a

Hi, We''re trying to rewrite veeeery old Rails app that we successfully managed to move to 1.2.6 and now we''re trying with 2.1.0. One of the problems is caused by :include in AR.find. Rails 1.2.6 generates totally different SQL query than 2.1.0. Here''s Rails find query and generated SQL queries: Foo.find(:all, :include => :ticket, :conditions =>

I''m on the downhill side of a large project that requires an additional integer field to be added to the tag.rb in acts_as_taggable. I feel I have a good understanding of ActiveRecord and have performed the correct migrations. (As a short background for those following this thread) when one wants to add tags to a model they call the ''tag_with'' method that jumps into

I have been getting this error message on various pages, just wondering if anyone could explain whats going wrong, and the best way to correct it code that is cuasing the problem is below @project = Project.find(:first, :conditions => "id = " + @purchaseorder.project_id) -- Posted via http://www.ruby-forum.com/.

Dear list, In the app we are making we have a rout something like this: map.resources :projects do |projects| projects.resources :pages, :controller =>"Wiki::Pages", :path_prefix => "/projects/:project_id/ wiki", :name_prefix => "project_wiki_" end But I can''t get RSpec(I''m very new to it) to accept this. It keeps throwing errors:

on previous apps i hadn''t really worried much about adding foreign key indexes on my tables just because they''ve been fairly small and i didn''t really think i needed them. well, i''m working on something now that has the potential to have a lot more data, and a lot more foreign keys. so i have 3 tables... users, projects, and tasks.. should i be using add_index

I''m not quite sure how to get at this data using Actrive record.. I''m trying to get all the appointments made for a particular project. I''m using four models, Projects, Tasks, Resources and Appointments. The SQL gets me what I''m looking for but how do I do it using Active Record? Select a.* from appointments a join resources r on r.id = a.resource_id join

Hello All, I am new to ROR, and can''t seem to get HABTM to cooperate entirely... however I might be abusing it! Before I try a different strategy I thought I''d ask here and see if I''m missing something simple. So say Projects and Companies are related. Projects can have multiple Companies, and Companies can be on multiple Projects. But, the same Company can also

[rails 3.2.2] I perform an ajax call : ... $.ajax url: " /backoffice/expenses/rate" type: "GET" dataType: "json" data: project_id: $(''#project_id'').val() code: $(this).val() success: (result) -> alert result $(''#expense_price'').val(result) in

I have a master record called ''project'' and a child record called ''agycode''. Obviously, agycode has a project_id FK. I wish to make the "descr" field unique ONLY within the ''project_id'' ''scope''. Here are the key pieces of information Agycode fields (id, project_id, descr) Here''s the declaration in the

I''m trying to build a dashboard type page (similar in function to basecamp''s) where I can show the last 5 updated items from my 3 differing models, then grouped together by project. Solution ideas: (1) Is it best to create a log model where everytime I add or update another model (like messages, comments, lists etc) an enrty gets added to the log along with the project. I

I have a large dataset (~1 million rows) of three variables: ID (patient's name), DATE (of appointment) and DIAGNOSIS (given on that date). Patients may have been assigned more than one diagnosis at any one appointment - leading to two rows, same ID and DATE but different DIAGNOSIS. The diagnoses may change between appointments. I want to subset the data in two ways: - define groups