similar to: reduce the size of list

say I have a matrix and lists like x <- matrix(c(12.1, 3.44, 0.1, 3, 12, 33.1, 1.1, 23), nrow=2) x.list <- lapply(seq_len(nrow(x)), function(i) x[i,]) if I want a column of the matrix x, I write x[, 2] for example. But how can I do something similar for a set of lists, x.list, above? > x.list [[1]] [1] 12.1 0.1 12.0 1.1 [[2]] [1] 3.44 3.00 33.10 23.00 unlist(x.list)[,2] does

Has anyone plotted or is it possible to plot CIE *xy* chromaticity diagram http://en.wikipedia.org/wiki/File:CIE1931xy_blank.svg I need this plot in color. ishida [[alternative HTML version deleted]]

I need to develop a simple list manipulation. Although it seems easier to do it in matrix form, but I need it in list form. I have a matrix x <- matrix(c(12.1, 3.44, 0.1, 3, 12, 33.1, 1.1, 23), nrow=2) for list form example, the conversion is x.list <- lapply(seq_len(nrow(x)), function(i) x[i,]) ### list version calcnorm=function(a, b){ diff <- mapply("-", a, b)

I am not sure if I should ask this question in this list. But I'll try. Currently I am trying to analyze images using EBImage and biOps. One of the features that I need to extract from various images is the color spectrum, namely, which colors each image consists of. So, each image hopefully can be converted into some sort of color histogram so that color ingredients are easily comparable

R-64 latest Hi. I am trying to plot a set of csv data, which looks like > head(interval) date inteval 1 2012-07-01 00:57:54 +0900 156 2 2012-07-01 01:07:41 +0900 587 3 2012-07-01 01:09:31 +0900 110 4 2012-07-01 01:18:42 +0900 551 5 2012-07-01 01:39:01 +0900 1219 6 2012-07-01 01:40:40 +0900 99 as you can see, more than one event happens each day,

Rails 3.1.3 Hi. I''m a little confused with Devise and ActionMailer. It seems that Devise has its own way of sending mails through ActionMailer. Does it generate Mailer class when "rails g devise..." command is executed? Or do I need to do some special command in order to generate Mailer? I have certainly set up a devise User table but there is no Mailer class for it,

rails 3.2.11 My app has User model, its one of the fields is entrepreneur:boolean. So users have two types; one is normal users, the other is professional users. For normal users, only emails and usernames are required and other fields are optional. For professional users, in addition to above, addresses and real names are required. Is there any Ruby way to set the requirement depending on the

Rails 3.1.3 rspec-rails (2.11.4) rspec 2.11.1 I am new to rspec. I don''t quite understand tests for POST create part. I have generated scaffold, and simultaneously it generated controller_spec.rb as well. it "assigns a newly created plan as @plan" do post :create, {:plan => valid_attributes}, valid_session assigns(:plan).should be_a(Plan)

Rails 3.1.3 After watching http://railscasts.com/episodes/258-token-fields?autoplay=true I have installed the similar functionality to my app. However, def index @cities = City.all ... does in fact give the list of all cities in the text field, but def index @cities = City.where("name like ?", "%#{params[:q]}%") ... does NOT

Rails 3.1.3 Hi. I have designed the database used for my travel plan application. You should be able to look at the diagram in the link below, hopefully. https://cacoo.com/diagrams/biDSyxh8yzk2kIeg ("belongs_to" is omitted since it''s obvious) Basically, the application can list the destinations from a choice of the departure. Not mention that the departure_id (integer) and

Rails 3.1.3 I have tables, Video and Script having association, Video 1 --- n Script So, every Script needs the parent id, in this case, video_id. If I simply create a new Script instance, the view renders as follows. <%= render :partial => "new_script", :locals => { :script => Script.new(:video_id => @video.id)} %> which works fine. Now I would like to

Rails 3.1.3 I believe this is a very very fundamental question, but since I am new to Rails, it''s more productive to ask someone to point out what I need to do. Say, I have a search method that generates a list of youtube videos. I have completed this part. And also, I have set up a database, Video, whose fields are video_title and URL. I need to place a button to each of these video

Rails3.1.3 I have db type, startp:integer I need to change it to float. More specifically, 1.2, 45.1, 143.8 ... I have two questions: 1. Is removing and adding the field through migration the only way? in other words, is there a single command to change the type? 2. Is there anyway to limit the decimal place to only one? 56.3, 34.2... are acceptable, but 23.112, 77.34, ... are

ruby 1.9.3p194 (2012-04-20 revision 35410) [i686-linux] rails 3.1.3 Ubuntu 10.04 LTS I have another environment with MacOSX Snow Leopard, and am sharing the Rails project files through Dropbox. When I chose to develop a project further in this Ubuntu machine, I have executed ''bundle install'' which gave an error #--------- Gem::Installer::ExtensionBuildError: ERROR: Failed to

Rails 3.2.11 Sidekiq latest My app continues background jobs that generate texts as the output. class ProcessText include Sidekiq::Worker def perform(name, count) puts "executing..." @feed = Feed.first @feed.process # here it returns String results! end end What I want is basically how to send (or push?) the result texts to a particular web

Rails 3.1.3 I have a model ''Airline'', whose STRING column is ''company'' only. Also, another model ''Plan'' has an INTEGER column ''airline_id''. I would like to show the ''company'' name (string) in a template like <% @plans.each do |plan| %> Airline: <%=

platform x86_64-apple-darwin9.8.0 arch x86_64 os darwin9.8.0 system x86_64, darwin9.8.0 version.string R version 2.13.1 (2011-07-08) I am trying to write a function that takes a few objects as input. test <- function(directory, num = 1:100) { > } the argument, "num", has the default value. But when the function is called, it can take an array

Rails 3.1.3 I have changed a regular scaffold action a bit so that it can save using ajax. All I needed to do was adding ":remote => true" in <div id="script_new"> <%= form_for script, :remote => true do |f| %> <!-- HERE!!! --> <%= f.hidden_field :video_id %> <%= f.text_field :text %> <%= f.submit "save" %>

Rails 3.1.3 Globalize3 latest I am not sure if I can ask this question here in general Rails forum. But I''ll try. Currently I am using a gem, Globalize3, which is useful for model I18n. https://github.com/svenfuchs/globalize3 Say, I have a model City, having only one column, name. City names appear differently depending on the language, so perhaps this particular gem is useful.

version.string R version 2.15.2 (2012-10-26) I am trying to install biOps on MacOS X 10.8.2 First, I have tiff, fftw-3, jpeg and set paths like cd /usr/include sudo ln -s /usr/local/include/fftw3.h for x in /usr/local/include/j*.h; do sudo ln -s $x; done for x in /usr/local/include/tiff*.h; do sudo ln -s $x; done cd /usr/lib for x in /usr/local/lib/libfftw3.*; do sudo ln -s $x; done for x in