ruby,file,csv,dir , Saying there are 0 arguments when I have 2? Trying to open a CSV file to write into

## Question:

Tag: ruby,file,csv,dir

I'm trying to read from a CSV file and codify people into groups using an equation. I append the name of their group they fall into to the end of the array that their row creates. Then I write it to a new file so I don't overwrite the original file in case something goes wrong.

Also, it loops through the directory and does this for multiple csv files.

However, when I try to open the new file to write into, it's saying this:

Segmenter.rb:12:in open': wrong number of arguments (0 for 1) (ArgumentError)
from Segmenter.rb:12:in foreach'
from Segmenter.rb:12:in <main>'


Here is the script with the coefficients removed. All the x's in the coefficients array are numbers in my script.

require 'csv'

coefficients = [
[x, x, x, x, x, x, x, x, x, "Utilitarians"],
[x, x, x, x, x, x, x, x, x, "Hometown School/Social"],
[x, x, x, x, x, x, x, x, x, "State Pride"],
[x, x, x, x, x, x, x, x, x, "Hard-Wired Advocates"],
[x, x, x, x, x, x, x, x, x, "Game Hunters"]
]

Dir.foreach do |current_file|

data_set.array.each do |row|
segment_value = 0
segment_name = ""
coefficients.each do |segment|
if (segment[0] *  row[1] + segment[1]*row[2] + segment[2]*row[3] + segment[3]*row[4] + segment[4]*row[5] + segment[5]*row[6] + segment[6]*row[7] + segment[7]*row[8]) > segment_value
segment_value = segment[0] *  row[1] + segment[1]*row[2] + segment[2]*row[3] + segment[3]*row[4] + segment[4]*row[5] + segment[5]*row[6] + segment[6]*row[7] + segment[7]*row[8]
segment_name = segment[8]
end
row << segment_name
end

CSV.open("#{current_file.basename} SEGMENTED.csv", "w") do |writer|
data_set.array.each do |data|
writer << data
end
end

end

end


I believe the problem is with Dir.foreach, not CSV.open.

You need to supply a directory to foreach as an argument. That's why you are getting the missing argument error.

Try:

Dir.foreach('/path/to_my/directory') do |current_file|

I think the open that is referenced in the error message is when Dir is trying to find the directory to open in order to get the file list for foreach`.

# Related:

## Rails shared controller actions

ruby-on-rails,ruby,ruby-on-rails-4
I am having trouble building a controller concern. I would like the concern to extend the classes available actions. Given I have the controller 'SamplesController' class SamplesController < ApplicationController include Searchable perform_search_on(Sample, handle: [ClothingType, Company, Collection, Color]) end I include the module 'Searchable' module Searchable extend ActiveSupport::Concern module ClassMethods def...

## is there an equivalent of the ruby any method in javascript?

javascript,arrays,ruby,iteration
Is there an equivalent of ruby's any method for arrays but in javascript? I'm looking for something like this: arr = ['foo','bar','fizz', 'buzz'] arr.any? { |w| w.include? 'z' } #=> true I can get a similar effect with javascript's forEach method but it requires iterating through the entire array rather...

## Loop until i get correct user

ruby,redis
I have users stored in Redis and want to be able to call only certain subsets from a set, if i don't get the correct user back i want to put it back in the set and then try again until i get one of the desired users @redis =...

## Ruby- get a xml node value

ruby,xml
can someone help me in extracting the node value for the element "Name". Type 1: I am able to extract the "name" value for the below xml by using the below code <Element> <Details> <ID>20367</ID> <Name>Ram</Name> <Name>Sam</Name> </Details> </Element> doc = Nokogiri::XML(response.body) values = doc.xpath('//Name').map{ |node| node.text}.join ',' puts values...

## Get the actual value of a boolean attribute

ruby,page-object-gem,rspec3,rspec-expectations
I have the span: <span disabled="disabled">Edit Member</span> When I try to get the value of the disabled attribute: page.in_iframe(:id => 'MembersAreaFrame') do |frame| expect(page.span_element(:xpath => "//span[text()='Edit Member']", :frame => frame).attribute('disabled')).to eq("disabled") end I get: expected: "disabled" got: "true" How do I get the value of specified attribute instead of a...

## String#scan not capturing all occurences

ruby,regex
I'm facing a very strange behaviour with ruby String#scan method return. I have this code below and I can't find out why "scan" doesn't return 2 elements. str = "10011011001" regexp = "0110" p str.scan(/(#{regexp})/) ==> [["0110"]] String "str" clearly contains 2 occurences of pattern "0110". I want to fetch...

## Heroku RAM not increasing with upgraded dynos

ruby-on-rails,ruby,ruby-on-rails-3,memory,heroku
I have a massive function i have been calling manually through the heroku rails console. I have been receiving the error rapid fire in my logs: 2015-06-22T14:56:42.940517+00:00 heroku[run.9877]: Process running mem=575M(112.4%) 2015-06-22T14:56:42.940517+00:00 heroku[run.9877]: Error R14 (Memory quota exceeded) A 1X dyno is suppose to have 512 MB of RAM. I...

## IllegalStateException: Iterator already obtained [duplicate]

java,file,loops,path
This question already has an answer here: java.lang.IllegalStateException: Iterator already obtained 1 answer so I wrote a little Java program to test a little stack language I made vie various test file, but for some reason it won't work. Here is the code: import org.apache.commons.io.FilenameUtils; import java.io.IOException; import java.nio.file.*;...

## How to get rid of .ignore file in Git?

git,file,bitbucket,ignore
I have create an ignore file , the list included .jar files . I then merged my branch to a development branch and even though I had resolved all my conflicts , I still had a lot of errors. Most of them had something to do with support.v4 (the import...

## Seeding fails validation for nested tables (validates_presence_of)

ruby-on-rails,ruby,validation,ruby-on-rails-4,associations
An Organization model has a 1:many association with a User model. I have the following validation in my User model file: belongs_to :organization validates_presence_of :organization_id, :unless => 'usertype==1' If usertype is 1, it means the user will have no organization associated to it. For a different usertype the presence of...

## Ruby access words in string

ruby
I don't understand the best method to access a certain word by it's number in a string. I tried using [] to access a word but instead it returns letter. puts s # => I went for a walk puts s[3] # => w ...

## RSpec test for rake task

I have created a custom rake task that deletes all items that are >= 7 days old. I am trying to write a RSpec test for this new task but it seems like my task isn't really running in the test. I have tested the task manually and it works...

## Appending an element to a page in VoltRb

html,ruby,opalrb,voltrb
I'm trying to append an element to one of my pages in a Volt project, via opal-browser, like so: if RUBY_PLATFORM == 'opal' require 'browser' \$document.body << my_dom_element.to_n end # controller code below Unfortunately, I'm getting an error: [Error] TypeError: null is not an object (evaluating 'value.nodeType') (anonymous function) (main.js,...

## Ruby gsub group parameters do not work when preceded by escaped slashes

ruby,regex
I am trying to perform a trivial substitution, that in any other language I have come across, work as per the documentation. However, my substitution fails for some reason. The documentation examples list: "hello".gsub(/[aeiou]/, '*') #=> "h*ll*" "hello".gsub(/([aeiou])/, '<\1>') #=> "h<e>ll<o>" "hello".gsub(/./) {|s| s.ord.to_s + ' '} #=> "104 101...

## Split an array into slices, with groupings

arrays,ruby,enumerable
I've got some Ruby code here, that works, but I'm certain I'm not doing it as efficiently as I can. I have an Array of Objects, along this line: [ { name: "foo1", location: "new york" }, { name: "foo2", location: "new york" }, { name: "foo3", location: "new york"...

## regex to pull in number with decimal or comma

ruby,regex
This is my line of code: col_value = line_item[column].scan(/\d+./).join().to_i When I enter 30,000 into the textfield, col_value is 30. I want it to bring in any number: 30,000 30.5 30.55 30000 Any of these are valid... Is there a problem with the scan and or join which would cause it...

## How to pivot array into another array in Ruby

arrays,ruby,csv
I have a multidimensional array like this one : myArray = [["Alaska","Rain","3"],["Alaska","Snow","4"],["Alabama","Snow","2"],["Alabama","Hail","1"]] I would like to end up with CSV output like this. State,Snow,Rain,Hail Alaska,4,3,nil Alabama,2,nil,1 I know that to get this outputted to CSV the way I want it I have to have output array like this: outputArray =[["State","Snow","Rain","Hail"],["Alaska",4,3,nil],["Alabama",2,nil,1]]...

## Strings vs binary for storing variables inside the file format

c++,file,hdf5,dataformat
We aim at using HDF5 for our data format. HDF5 has been selected because it is a hierarchical filesystem-like cross-platform data format and it supports large amounts of data. The file will contain arrays and some parameters. The question is about how to store the parameters (which are not made...

## Stack level too deep because recursion

I have a model named Tweet. The columns of the Tweet model are: -id -content -user_id -picture -group -original_tweet_id Every tweet can have one or multiple retweets. The relation happens with the help of original_tweet_id. All the tweets have original_tweet_id nil , whilst the retweets contain the id of the...

## On rendering from controller, current_page method does not seem to work

ruby-on-rails,ruby,ruby-on-rails-4,model-view-controller
I have a navigation bar included in application.html.erb. Because for some pages, such as the signup page, I need to place additional code inside the navigation bar, I have excluded those pages for showing the navigation bar through application.html.erb and instead included it in their respective view pages. See code...

## Can't map a range of dates in Ruby/Rails

ruby-on-rails,ruby
I'm trying to map a range of dates and pass them to my view as an array, as follows: from, to = Date.parse("2014-01-01"), Date.yesterday date_range = (from..to) @mapped_dates = date_range.map {|date| date.strftime("%b %e")} I reference them in some JS in my view as follows: dateLabels = <%= raw @mapped_dates.to_json %>;...

## In Ruby how to put multiple lines in one guard clause?

ruby-on-rails,ruby
I have the following line of code : if params[:"available_#{district.id}"] == 'true' @deliverycharge = @product.deliverycharges.create!(districtrate_id: district.id) delivery_custom_price(district) end Rubocop highlight it and asks me to use a guard clause for it. How can I do it? EDIT : Rubocop highlighted the first line and gave this message Use a guard...

## Map with accumulator on an array

ruby,inject
I'm looking to create a method for Enumerable that does map and inject at the same time. For example, calling it map_with_accumulator, [1,2,3,4].map_with_accumulator(:+) # => [1, 3, 6, 10] or for strings ['a','b','c','d'].map_with_accumulator {|acc,el| acc + '_' + el} # => ['a','a_b','a_b_c','a_b_c_d'] I fail to get a solution working. I...

## Storing columns on disk and reading rows

c++,file,matrix,io
So I have a C++ code that finds the inverse of a square matrix. The inverse is full and it would be bad to keep it all in memory because I am working with hundreds of thousands of columns. My code generates the columns one by one. After finding the...

## Iterating over EncryptedDataBagItem in Chef Recipe

ruby,json,chef,devops
I would like to decrypt a chef data bag item (named passwords) and store all of its attributes in a temporary JSON file which is read (and then deleted) by a node.js app. Is there a way to iterate over attributes of a data bag ITEM and get their values?...

## Allowing some enabled and disabled option on collection_select

ruby-on-rails,ruby
I am trying to populate a dropdown box on a view that has all the states. This works just fine: <%= f.collection_select :state_id, @states, :id, :name %> Now, I need to make the following: Some states are going to be disabled for choosing, but they still have to appear on...

## Delphi - Use a string variable's name in assignfile()

file,delphi,variables,assign
Is it possible to use a variable in the assignfile command? Eg. f : Textfile ; sFile : string ; {contains 'MyFile.txt' as content} ... cFileDir = 'C:\Users\User\Desktop\Data Engine\Data\Country' ; ... Assignfile(f, cFileDir + '\' + sFile) ; ... I appreciate your help very much. if it's unclear I'll edit...