counting

问题 Given a multidimensional array like this: var arr = [ "apple", ["banana", "strawberry","dsffsd", "apple"], "banana", ["sdfdsf","apple",["apple",["nonapple", "apple",["apple"]]]] ,"apple"]; the challenge was to write a function that keeps the array and an item as arguments and return how many times that item appears in the array. My first solution did the trick: function countItems(arr, item, sumarr = []) { // sumarr = array to store items matched for (let i = 0; i < arr.length; i++ ){ //

问题 I already found out how to count cases based on two conditions: sum(dat2$happy > 7 & dat2$induction == 1) But do you know how I can include a range of values as a criterion? One out of many codes I tried: sum(dat2[dat2$happy > 4 & dat2$happy < 8] & dat2$induction == 2) Tank you so much! 来源： https://stackoverflow.com/questions/65923147/counting-cases-two-conditions-range-of-values

问题 I've written a piece of java code that when given an array (arrayX), works out the prefix averages of that array and outputs them in another array (arrayA). I am supposed to count the primitive operations and calculate the Big-O notation (which i'm guessing is the overall number of calculations). I have included the java code and what I believe to be the number of primitive operations next to each line, but I am unsure whether I have counted them correctly. Thanks in advance and sorry for my

问题 I would like to thank for all the help already in advance, as the help until now has allowed me go get new ideas/hypotheses on how my data could be analysed. Data structure(list(record_id = c(110101, 110101, 110101, 110101, 110101, 110101, 110101, 110101, 110101, 110101, 110101, 110101, 110101, 110101, 110101, 110101, 110101, 110101, 110101, 110101, 110101, 110101, 110101, 110101, 110101, 110101, 110101, 110101, 110101, 110101, 110101, 110101, 110101, 110101, 110101, 110101, 110101, 110101,

问题 I am fairly new to python, but I haven't been able to find a solution to my problem anywhere. I want to count the occurrences of a string inside a list of tuples. Here is the list of tuples: list1 = [ ('12392', 'some string', 'some other string'), ('12392', 'some new string', 'some other string'), ('7862', None, 'some other string') ] I've tried this but it just prints 0 for entry in list1: print list1.count(entry[0]) As the same ID occurs twice in the list, this should return: 2 1 I also

问题 I am fairly new to python, but I haven't been able to find a solution to my problem anywhere. I want to count the occurrences of a string inside a list of tuples. Here is the list of tuples: list1 = [ ('12392', 'some string', 'some other string'), ('12392', 'some new string', 'some other string'), ('7862', None, 'some other string') ] I've tried this but it just prints 0 for entry in list1: print list1.count(entry[0]) As the same ID occurs twice in the list, this should return: 2 1 I also

问题 I'm trying to make a program that counts all the vowels and all the consonants in a text file. However, if the file has a word such as cat it says that there are 3 consonants and 1 vowel when there should be 2 consonants and 1 vowel. #include <string> #include <cassert> #include <cstdio> using namespace std; int main(void) { int i, j; string inputFileName; ifstream fileIn; char ch; cout<<"Enter the name of the file of characters: "; cin>>inputFileName; fileIn.open(inputFileName.data());

问题 I'm trying to make a program that counts all the vowels and all the consonants in a text file. However, if the file has a word such as cat it says that there are 3 consonants and 1 vowel when there should be 2 consonants and 1 vowel. #include <string> #include <cassert> #include <cstdio> using namespace std; int main(void) { int i, j; string inputFileName; ifstream fileIn; char ch; cout<<"Enter the name of the file of characters: "; cin>>inputFileName; fileIn.open(inputFileName.data());

问题 I've just started to learn python. I'm curious about what are the efficient ways to count the occurrence of a specific word in a CSV file, other than simply use for loop to go through line by line and read. To be more specific, let's say I have a CSV file contain two columns, "Name" and "Grade", with millions of records. How would one count the occurrence of "A" under "Grade"? Python code samples would be greatly appreciated! 回答1: Basic example, with using csv and collections.Counter (Python

问题 How do I count the letters in Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch? print(len('Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch')) Says 58 Well if it was that easy I wouldn't be asking you, now would I?! Wikipedia says (https://en.wikipedia.org/wiki/Llanfairpwllgwyngyll#Placename_and_toponymy) The long form of the name is the longest place name in the United Kingdom and one of the longest in the world at 58 characters (51 "letters" since "ch" and "ll" are