combinations

问题 Given an array and a length, I want to derive every possible combination of elements (non-repeating) at the specific length. So given an array of: arr = ['a','b','c','d'] and a length of 3, I'm after a function that outputs a 2-dimensional array as follows: result = [ ['a','b','c'], ['b','c','a'], ['c','a','b'], . . . etc. ] I've tried tackling this and have had a deal of difficulty. 回答1: The following code uses a brute-force approach. It generates every permutation of every combination of

问题 I have a dataframe that has 6 categorical/string values. I want to create a dataframe of all possible combination of these string values where order DOES NOT matter (i.e. a, b = b, a). I did the following but I see that the result is a permutation and not a combination i.e. it distinguishes (IL, IL-1) from (IL-1, IL). I have read through: http://pandas.pydata.org/pandas-docs/stable/merging.html#brief-primer-on-merge-methods-relational-algebra In mysql I can do this via: select r1.id, r2,id

问题 I have a string of numerical values separated with spaces: 70 58 81 909 70 215 70 1022 580 930 898 70 276 31 11 **920 898** 1503 195 770 573 508 1015 31 8 815 1478 31 1022 31 1506 31 **318 500 358 865** 358 991 518 58 450 420 487 31 1478 108 70 1022 31 215 318 500 61 31 655 1061 918 54 898 31 8 1011 9 8 459 346 770 751 31 346 770 880 1171 688 1680 31 1002 769 500 61 8 702 898 8 1206 31 709 565 8 138 58 215 81 1171 31 288 500 380 70 284 1500 565 31 601 55 1501 490 565 530 56 990 380 1061 770

问题 I am all new here and also a beginner. I am working on a personal project (developing an app for personal use). I am a bit stuck and yes, I did search around but couldn't find much. My aim is to find all possible combinations. Let's say I have a finite number of lists defined like: List<String> AList contains {"a1","a2","a3","a4"} List<String> BList contains {"b1","b2","b3"} List<String> CList contains {"c1","c2","c3","c4","c5"} List<String> DList contains {"d1","d2"} I would like to find all

问题 I hope it's Monday-itis kicking in at the moment, but something I feel should be quite easy - or at least elegant - is giving me a brain fart. The use case is this: Find all possible combinations of a specific word, where letters can be any case or replaced with letters. For instance: Word: 'Password' Combinations: 'PASSWORD', 'P@ssw0rd', 'p@55w0rD' ... I do not want to write 7 loops to find this out, even though it's a once off script we'll never ever use again. 回答1: import itertools places

问题 I have a table of values: +-----+-------+ | ID | STATE | +-----+-------+ | 1 | AL | | 1 | AZ | | 1 | MI | | 2 | TX | | 2 | TN | | 2 | MO | | 2 | ND | And many, many more... How do I write a query that generates all of the possible state combinations for each individual ID? So the results are like: +-----+-------------+ | ID | COMBINATION | +-----+-------------+ | 1 | AL, AZ | | 1 | AL, MI | | 1 | AZ, MI | | 1 | AL, AZ, MI | | 2 | TX, TN | | 2 | TX, MO | | 2 | TX, ND | | 2 | TN, MO | | 2 | TN,

问题 I have a file with several string (text) variables where each respondent has written a sentence or two for each variable. I want to be able to find the frequency of each combination of words (i.e. how often "capability" occurs with "performance"). My code so far goes: #Setting up the data file data.text <- scan("C:/temp/tester.csv", what="char", sep="\n") #Change everything to lower text data.text <- tolower(data.text) #Split the strings into separate words data.words.list <- strsplit(data

问题 How to implement combinations of permutation & combination in angular 2+. Eg. we have 5 nodes. Say a,b,c,d,e. And all are arrays. So the combination goes like - 5C2 = (5)! / (2)!*(3)! = 10. Now how to make the looping for - a->b a->c a->d a->e b ->c b->d b->e c->d c->e d->e where - a = [claimRequest, claimBody] b = [ claimBody, eventType] c= [ claimRequest ] d= [ headerRequest, claimRequest] e = [eventType] Now my query is where i have to input the two combinations are in place of value1 and

问题 I don't actually know how to describe what I wanted but I'll show you: For example: $data1 = "the color is"; $data2 = "red"; What should I do (or process) so $result is the combination of $data1 and $data2 ? Desired result: $result = "the color is red"; 回答1: $result = $data1 . $data2; This is called string concatenation. Your example lacks a space though, so for that specifically, you would need: $result = $data1 . ' ' . $data2; 回答2: There are several ways to concatenate two strings together.

问题 This question already has answers here : Permutations in JavaScript? (33 answers) Shuffle an array as many as possible (8 answers) Closed 5 years ago . I'm looking for a good way to make a program for this problem: First an array with string values is given: var array1 = ["a", "b", "c", "d"] Next I would like to store every possible combination(order) of the string values in new arrays ex: combo1 = ["a", "b", "d", "c"] combo2 = ["a", "c", "b", "d"] combo3 = [...etc.] The program needs to be