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问题 This question already has answers here : CMD or Powershell command to combine (merge) corresponding lines from two files (6 answers) Closed 2 years ago . I have 2 csv files, I want to add a new column from file A to file B to a new file. Atm, It doesn't take the values from A. File A.csv ID Name 1 Peter 2 Dalas File B.CSV Class Math Physic New file will be: ID Name Class 1 Peter Math 2 Dalas Physics Both files have the same number of rows. As the following the code I'm using, I would like to

问题 New to Ruby. Receiving error: undefined method `+' for nil:NilClass (NoMethodError) I do not understand why I am receiving an error for such a simple task of incrementing a value. However, perhaps the error is caused by something else. What is the cause? class LinkedList class Node attr_accessor :data, :nextNode def initialize(data = nil, nextNode = nil) @data = data @nextNode = nextNode end end #member variables @head = nil @size = 0 def initialize @head = Node.new() end def add(val) curr =

问题 Hi i am trying to show two item in list view.i know we can do this with the following. ArrayList<Map<String, String>> but i need to show one image along with this two item. Here is a image which I want. I create xml file with one imageview and two text view.i don't understand how to do this. 回答1: You should implement the class ArrayAdapter and create your own ListAdapter . See: http://www.vogella.com/articles/AndroidListView/article.html 回答2: You need to create a Layout file with your cell

问题 I have a dataframe like this: V1 V2 V3 1 1 3423086 3423685 2 1 3467184 3467723 3 1 4115236 4115672 4 1 5202437 5203057 5 2 7132558 7133089 6 2 7448688 7449283 I want to change the V1 column and add chr before the number. Just like this: V1 V2 V3 1 chr1 3423086 3423685 2 chr1 3467184 3467723 3 chr1 4115236 4115672 4 chr1 5202437 5203057 5 chr2 7132558 7133089 6 chr2 7448688 7449283 Is there a way to do this in R? 回答1: The regex pattern "^" (outside any character-class brackets) represents the

问题 prefs.java Intent resultValue = new Intent(); resultValue.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId); setResult(RESULT_OK, resultValue); Context context = getApplicationContext(); RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.main); Intent configIntent = new Intent(context, Prefs.class); configIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId); PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, configIntent,

问题 I found very useful function reduce() , and I'm using it, but I'm not sure if I understand it properly. Can any one help me to understand this function? Example: var arr = [1,2,3,4,5,6]; arr.reduce(function(p,n){ return p+n; },0); // Output 21 This is my understanding: Reduce() loop through every element of the array and returning previous + current value . Ex. 0+1, 1+2 etc. In this case this function will return [0] - return 1; [1] - return 3; [2] - return 5, [3] - return 7, [4] - return 9,

问题 I have the following issue: when trying to add to a sum of BigIntegers the outcome remains 0. Here is the code: public void NumberOfOutcomes(int x, int y){ BigInteger first = BigInteger.valueOf(0); BigInteger second = BigInteger.valueOf(0); for(int i = 0; i <= (x / 2); i++){ first.add( fac(x - i).divide((fac(x - 2*i).multiply(fac(i)))) ); System.out.println("First " + first.add( fac(x - i).divide((fac(x - 2*i).multiply(fac(i)))) )); } for(int i = 0; i <= (y / 2); i++){ second.add( fac(y - i)

问题 I have 4 csv files named PV.csv, Dwel.csv, Sess.csv, and Elap.csv. I have 15 columns and arouind 2000 rows in each file. At first I would like to add a new column named Var in each file and fill up the cells of the new column with the same file name. Therefore, new column 'Var' in PV.csv file will filled up by PV. Same is for other 3 files. After that I would like to manipulate the all the files as follows. Finally I would like to merge / join these 4 files based on the A_ID and B_ID and

问题 I have created a shopping cart page using PHP. Now the problem I encountered was that, when I add a product to the cart from the product list, what happens is that only the 1st product on the list is added. When I add another product (since every product on the list has it's own Add to Cart button), the 1st product is added again. Doesn't matter what item I choose, it still end up with the 1st product being added. Am I missing something? Here's my code: Product List: <?php do { ?> <tr> <td

问题 I'm developing an App that needs Localization. I've followed these steps: I've created the es.lproj, it.lproj, en.lproj folders in the root of the project with finder. I've created the Localizable.strings file in each folder with the key pair values corresponding to the target language. I've imported with Add Files To option from Xcode. When I test the App in the iphone simulator all works fine. I configure the iphone to any localizaed language and the app is translated properly. But when I