sorting

问题 I have an application where a user provides me with the name of a field, e.g name or costInCents , and I have to sort by that field. I have ways of guaranteeing that the field name will be correct. This application causes the complication that I simply cannot make my class Comparable and implement a specific compareTo() , since with a custom implementation of compareTo() I need to know which fields / methods to use at implementation time. So to achieve this goal, I am trying to use reflection

问题 This is an extension to my previous question: Consider below df : In [68]: df = pd.DataFrame({'A': ['a'] * 11, ...: 'B': ['b'] * 11, ...: 'C': ['C1', 'C1', 'C2','C1', 'C3', 'C3', 'C2', 'C3', 'C3', 'C2', 'C2'], ...: 'D': ['D1', 'D2', 'D1', 'D3', 'D3', 'D2', 'D4', 'D4', 'D1', 'D2', 'D3'], ...: 'E': [{'value': '4', 'percentage': None}, {'value': 5, 'percentage': None}, {'value': 12, 'percentage': None}, {'value': 9, 'percentage': None}, {'value': '12', 'percentage': None}, {'value': 'N/A',

问题 This is an extension to my previous question: Consider below df : In [68]: df = pd.DataFrame({'A': ['a'] * 11, ...: 'B': ['b'] * 11, ...: 'C': ['C1', 'C1', 'C2','C1', 'C3', 'C3', 'C2', 'C3', 'C3', 'C2', 'C2'], ...: 'D': ['D1', 'D2', 'D1', 'D3', 'D3', 'D2', 'D4', 'D4', 'D1', 'D2', 'D3'], ...: 'E': [{'value': '4', 'percentage': None}, {'value': 5, 'percentage': None}, {'value': 12, 'percentage': None}, {'value': 9, 'percentage': None}, {'value': '12', 'percentage': None}, {'value': 'N/A',

问题 I am doing a simple Data Frame that can read and write CSV, and includes sorting function to sort by column. How can I sort the correct column by inputting the Column Header, and exclude the Column Header row from the sorting? This is a sample data of the CSV file: Name,Age,Salary Lim,20,2000 Tan,20,3000 Mah,19,2500 Roger,10,4000 I have declared my 2D List, the data will looks like: List<List<String>> COLUMNDATA = new ArrayList(); COLUMNDATA = [[Name, Age, Salary], [Lim, 20, 2000], [Tan, 20,

问题 I am doing a simple Data Frame that can read and write CSV, and includes sorting function to sort by column. How can I sort the correct column by inputting the Column Header, and exclude the Column Header row from the sorting? This is a sample data of the CSV file: Name,Age,Salary Lim,20,2000 Tan,20,3000 Mah,19,2500 Roger,10,4000 I have declared my 2D List, the data will looks like: List<List<String>> COLUMNDATA = new ArrayList(); COLUMNDATA = [[Name, Age, Salary], [Lim, 20, 2000], [Tan, 20,

问题 Structure of input dataframe ds= structure(list(MSISDN = c(800, 800, 783, 975, 800)), .Names = "Number", row.names = c(NA, -5L), class = "data.frame") Need a simple output which looks like below (not able to add single break) Num Freq 800 3 975 1 783 1 回答1: Check out Tabyl function from janitor package. It does the task that you want plus a bit more library(janitor) ds <- structure(list(MSISDN = c(800, 800, 783,975, 800)), .Names = "Number", row.names = c(NA,-5L), class = "data.frame") tabyl

问题 Structure of input dataframe ds= structure(list(MSISDN = c(800, 800, 783, 975, 800)), .Names = "Number", row.names = c(NA, -5L), class = "data.frame") Need a simple output which looks like below (not able to add single break) Num Freq 800 3 975 1 783 1 回答1: Check out Tabyl function from janitor package. It does the task that you want plus a bit more library(janitor) ds <- structure(list(MSISDN = c(800, 800, 783,975, 800)), .Names = "Number", row.names = c(NA,-5L), class = "data.frame") tabyl

问题 I need to write a program that generates N random numbers and write them to binary file in descending order. It should be done without using any of sorting algorithms that use main memory. This is what I've done so far: #include <iostream> #include <fstream> #include <ctime> #include <cstdlib> using namespace std; int main () { srand(time(0)); rand(); int N; do{ cout << "Unesite N: "; cin >> N; } while(N<=0); ofstream br("broj.dat", ios::binary | ios::trunc); for(int i = 0; i<N; i++){ int a =

问题 I am a newbie on python, so I try to take the first 50 elements of a dictionary in python. I have a dictionary which is decreasing order sorted by value. k=0 l=0 for k in len(dict_d): l+=1 if l<51: print dict for a small example: dict_d={'m':'3','k':'4','g':'7','d':'9'} take the first 3 elements in a new dictionary: new_dict={'m':'3','k':'4','g':'7'} I could not find how to do that? 回答1: dict_d = {...} for key in sorted(dict_d)[:50]: print key, dict_d[key] 回答2: You can take 50 arbitrary

问题 I have a mixed array that I need to sort by number, alphabet and then by digit- ['A1', 'A10', 'A11', 'A12', 'A3A', 'A3B', 'A3', 'A4', 'B10', 'B2', 'F1', '1', '2', 'F3'] how do I sort it to be like: ['1', '2', 'A1', 'A2', 'A3', 'A3A', 'A3B', 'A4', 'A10', 'A11', 'A12', 'B2', 'B10', 'F1', 'F3'] Here is what I tried: var reA = /[^a-zA-Z]/g; var reN = /[^0-9]/g; function sortAlphaNum(a, b) { var AInt = parseInt(a.Field, 10); var BInt = parseInt(b.Field, 10); if (isNaN(AInt) && isNaN(BInt)) { var