concatenation

问题 I am fetching an array of data from SQL, and then concatenating them as strings for display. The function looks like this: function FetchTopStats( Conn, iLimit ) local sToReturn = "\tS.No. \t UserName \t Score\n\t" SQLQuery = assert( Conn:execute( string.format( [[SELECT username, totalcount FROM chatstat ORDER BY totalcount DESC LIMIT %d]], iLimit ) ) ) DataArray = SQLQuery:fetch ({}, "a") i = 1 while DataArray do sToReturn = sToReturn..tostring( i ).."\t"..DataArray.username.." \t ".

问题 I am trying to figure out how to create a single concatenated list using C#, originating from 3 separate lists. For example: List 1: Ugly, Pretty List 2: Dogs, Carts, Pigs List 3: Rock, Suck Output: Ugly Dogs Rock Ugly Dogs Suck Ugly Cats Rock Ugly Cats Suck Ugly Pigs Rock Ugly Pigs Suck Pretty Dogs Rock Pretty Dogs Suck Pretty Cats Rock Pretty Cats Suck Pretty Pigs Rock Pretty Pigs Suck I know it is just nested loops, but the part I cant figure out is how to use List-strings for each list.

问题 I have this code: def make_service(service_data, service_code): routes = () curr_route = () direct = () first = service_data[0] curr_dir = str(first[1]) for entry in service_data: direction = str(entry[1]) stop = entry[3] if direction == curr_dir: curr_route = curr_route + (stop, ) print((curr_route)) When I print((curr_route)), it gives me this result: ('43009',) ('43189', '43619') ('42319', '28109') ('42319', '28109', '28189') ('03239', '03211') ('E0599', '03531') How do I make it one tuple

问题 I am trying to concat 6 WebM video file same resolution and same codecs using this command ffmpeg -f concat -i mylist.txt -c copy finalvideo.webm but the resulted video freezes some part ,exactly where the each part concatenated and yes I am using the latest ffmpeg resulted video audio spectrum you easily see the video audio freezes https://i.stack.imgur.com/SX6WT.gif mylist.txt file '1.webm' file '2.webm' file '3.webm' file '4.webm' file '5.webm' file '6.webm' My log https://pastebin.com

问题 I would like to know a way to combine two files efficiently. I wanted to concatenate only even lines of FileB after even lines of FileA . I think it can be done easily with sed or awk. Any help is appreciated. FileA: A1 A2 A3 A4 A5 A6 . . FileB: B1 B2 B3 B4 B5 B6 . . Output: A1 A2 B2 A3 A4 B4 A5 . 回答1: Here is an approach that avoids storing one of the files in memory: awk -v f=FileB '{print} NR%2==0 {getline<f; getline<f; print}' FileA How it works: -v f=FileB This creates an awk variable f

问题 In some other programming languages I am used to, there was a way to dynamically create and call variables. How to do this in Python? For example let's suppose variables called test1; test2 etc. up to test9, and I want to call them like this: for n in range(1,10): print concatenate('test', n) Of course, the function concatenate is the one I am looking for. What is the command to combine strings, integers and regular expressions in this way? My example was a bad one, that made some of the

问题 I have a text file with text on each line. I would like to be able to put each line in one long line along with a space. So, if the text file has: Bob Jack Sam I want the result to be Bob Jack Sam Below are two methods that I am working on but I am stuck. Anything in brackets [] means that I know the syntax is completely wrong; I only put it there to show my thought process. The commented sections are just me experimenting and I have left them in case anyone wants to comment on what they

问题 I want to concatenate along the third dimension z = cat(3,A,B,C); Many many times. I if I was doing that along the second dimension then z = [A,B,C]; Would be faster than z = cat(2,A,B,C); Can a similar thing be done along the third dimension or is there any other way to speed this up? 回答1: There are some indexing options to get a slightly better performance than cat(3,...) . Both solutions use U(30,30,3)=0; instead of zeros(30,30,3) to preallocate, but it is unsave as it will result in a

问题 I need a formula/function to concatenate cell values from one column and multiple rows. The matching criteria is applied to a different column. Here is my example of what I have to do: Islington | "Bunhill" | EC2M Islington | "Bunhill" | EC2Y Islington | "Bunhill" | N1 Barnet | "Burnt Oak" | HA8 Barnet | "Burnt Oak" | NW7 Barnet | "Burnt Oak" | NW9 The end result needs to look like this: Islington | "Bunhill" | EC2M, EC2Y, N1 Barnet | "Burnt Oak" | HA8, NW7, NW9 Basically, I need to remove

问题 I want to concatenate a piece of text, for example "The answer is " with a signed integer, to give the output "The number is 42". I know how long the piece of text is (14 characters) but I don't know how many characters the string representation of the number will be. I assume the worst case scenario, the largest signed 16-bit integer has 5 digits, plus one extra in case it is negative, so is the following code the correct way to do it? #include <stdio.h> #include <stdlib.h> int main() { char