apply

问题 I have a data frame Indices containing various names which correspond to data frames ( i.e. a name "Index 1" has a corresponding data frame Index 1 ). Now I want to run my custom function calcScores over all data frames and add several columns to that data frame. Since I'm not in the global environment I return that "new" data frame and want to assign it back to the original variable Index 1 , so Index 1 now has the new data frame with the added columns. Here's my code (no chance I can make

问题 I am stuck :). I have two-level hierarchy, each level has child nodes. The goal is to use this structure to populate gui tree. I am trying to access child nodes of variant members in a generic manner. Following code does not compile, using vs2013. I'll appreciate the helping hand and/or advise on the design changes. #include "stdafx.h" #include <memory> #include <string> #include <vector> #include <boost/variant.hpp> class base {}; class A : public base { public: std::vector<std::shared_ptr

问题 I have a table: X1 X2 X3 Y1 10 12 15 Y2 45 5 23 Y3 12 47 56 How can I for each row calculate the sum and write the percentage of that sum near each value. For example: X1 percent X2 percent X3 percent Y1 10 27% 12 32% 15 40.5% Y2 45 .. 5 .. 23.. Y3 12 .. 47 .. 56.. 回答1: You could either use. If dat is the dataset ( dat is data.frame in this example) v1 <- paste0(round(prop.table(as.matrix(dat),margin=1),2)*100,"%") #suggested by @Ananda Mahto or v2 <- matrix(paste0(100*round(as.matrix(dat)

问题 I've got an R code that works and does what I want but It takes a huge time to run. Here is an explanation of what the code does and the code itself. I've got a vector of 200000 line containing street adresses (String) : data. Example : > data[150000,] address "15 rue andre lalande residence marguerite yourcenar 91000 evry france" And I have a matrix of 131x2 string elements which are 5grams (part of word) and the ids of the bags of NGrams (example of a 5Grams bag : ["stack", "tacko", "ackov"

问题 I hope this question is clear and feasible. I have many csv files labelled with a simple numeric ID (e.g., 1.csv, 2.csv, 3.csv, etc.). Another csv file contains the actual data like below ID Site Location Block 1 L1 1 a 2 L2 2 b 3 etc My question is how to link the ID in the data file to rename the csv files. The output I would ideally like to have is L11a.csv, L22b.csv, etc. I think I need to concatenate each row observation's Site, Location, and Block into another column and then use that

问题 Forgive me if this is a blatantly obvious question, I am a beginner R user eager to learn. I have a data frame of 4 columns with roughly 1.5 million rows containing coordinate information where each individual row represents a specific location. What I would like to do is run these data into a function that holds a series of if else statements that determine the area of the specific location within a larger box. For example, a point can be in the center, along the edge of the box within 1.5

问题 I am working with the Open Food Facts dataset which is very messy. There is a column called quantity in which in information about the quantity of respective food. the entries look like: 365 g (314 ml) 992 g 2.46 kg 0,33 litre 15.87oz 250 ml 1 L 33 cl ... and so on (very messy!!!) I want to create a new column called is_liquid . My idea is that if the quantity string contains an l or L the is_liquid field in this row should get a 1 and if not 0. Here is what I've tried: I wrote this function:

问题 Background I have a sample df with a Text column containing 0,1, or >1 ABC 's import pandas as pd df = pd.DataFrame({'Text' : ['Jon J Mmith ABC: 1111111 is this here', 'ABC: 1234567 Mary Lisa Rider found here', 'Jane A Doe is also here', 'ABC: 2222222 Tom T Tucker is here ABC: 2222222 too'], 'P_ID': [1,2,3,4], 'N_ID' : ['A1', 'A2', 'A3', 'A4'] }) #rearrange columns df = df[['Text','N_ID', 'P_ID']] df Text N_ID P_ID 0 Jon J Mmith ABC: 1111111 is this here A1 1 1 ABC: 1234567 Mary Lisa Rider

问题 I'm working with some Date columns and trying to cleanse for obviously incorrect dates. I've written a function using the safe.ifelse function mentioned here. Here's my toy data set: df1 <- data.frame(id = 1:25 , month1 = seq(as.Date('2012-01-01'), as.Date('2014-01-01'), by = 'month' ) , month2 = seq(as.Date('2012-01-01'), as.Date('2014-01-01'), by = 'month' ) , month3 = seq(as.Date('2012-01-01'), as.Date('2014-01-01'), by = 'month' ) , letter1 = letters[1:25] ) This works fine for a single

问题 I am trying to pass some vectors containing a list of nodes in to a function in clojure the function works if i was to type the variables in but i am not sure how to pass a single variable from each vector in at a time. (def ItemPickUp [:a1 :Mail]) (def ItemDestinations [:Storage :a1]) (def Robot {[ItemPickUp] [ItemDestinations]}) (defn shortestPath [g start dest] (let [not-destination? (fn [[vertex _]] (not= vertex dest))] (-> (shortest-paths g start) (->> (drop-while not-destination?))