intersect

问题 When I have 2 List<string> objects, then I can use Intersect and Except on them directly to get an output IEnumerable<string> . That's simple enough, but what if I want the intersection/disjuction on something more complex? Example, trying to get a collection of ClassA objects which is the result of the intersect on ClassA object's AStr1 and ClassB object's BStr ; : public class ClassA { public string AStr1 { get; set; } public string AStr2 { get; set; } public int AInt { get; set; } } public

问题 while looking at this question C# Similarities of two arrays it was noted that the initial linq call was significantly slower than subsequent calls. What is being cached that is making such a difference? I am interested in when we can expect to achieve this type of behavior (perhaps here it is simply because the same lists are used over and over). static void Main(string[] args) { var a = new List<int>() { 7, 17, 21, 29, 30, 33, 40, 42, 51, 53, 60, 63, 66, 68, 70, 84, 85, 91, 101, 102, 104,

问题 This question already has an answer here : Extracting common characters from multiple vectors of different lengths (1 answer) Closed 5 years ago . I have the following data as an example: basketball = c("MISS W. Johnson 18' Pullup Jump Shot", "MISS Barnes 12' Pullup Jump Shot", "MISS Carter 19' Pullup Jump Shot") How do I find the most common words or 'intersect' them so that I will only have "MISS Pullup Jump Shot" as the result? 回答1: This works, but I'm not sure how robust it is given your

问题 This question already has an answer here : Extracting common characters from multiple vectors of different lengths (1 answer) Closed 5 years ago . I have the following data as an example: basketball = c("MISS W. Johnson 18' Pullup Jump Shot", "MISS Barnes 12' Pullup Jump Shot", "MISS Carter 19' Pullup Jump Shot") How do I find the most common words or 'intersect' them so that I will only have "MISS Pullup Jump Shot" as the result? 回答1: This works, but I'm not sure how robust it is given your

问题 Intersect can be used to find matches between two collections, like so: // Assign two arrays. int[] array1 = { 1, 2, 3 }; int[] array2 = { 2, 3, 4 }; // Call Intersect extension method. var intersect = array1.Intersect(array2); // Write intersection to screen. foreach (int value in intersect) { Console.WriteLine(value); // Output: 2, 3 } However what I'd like to achieve is the opposite, I'd like to list items from one collection that are missing from the other : // Assign two arrays. int[]

问题 I have two lines that intersect at a point. I know the endpoints of the two lines. How do I compute the intersection point in Python? # Given these endpoints #line 1 A = [X, Y] B = [X, Y] #line 2 C = [X, Y] D = [X, Y] # Compute this: point_of_intersection = [X, Y] 回答1: Unlike other suggestions, this is short and doesn't use external libraries like numpy . (Not that using other libraries is bad...it's nice not need to, especially for such a simple problem.) def line_intersection(line1, line2):

问题 I have a code written in Matlab that uses 'intersect' to find the vectors (and their indices) that intersect in two large matrices. I found that 'intersect' is the slowest line (by a large difference) in my code. Unfortunately I couldn't find a faster alternative so far. As an example running the code below takes approx 5 seconds on my pc: profile on for i = 1 : 500 a = rand(10000,5); b = rand(10000,5); [intersectVectors, ind_a, ind_b] = intersect(a,b,'rows'); end profile viewer I was

问题 I have a two tables. TableA has two columns and TableB has one column. TableA ID | TERM_A TableB TERM_B TERM_A and TERM_B column contain terms . I want to take intersect terms from TERM_A column of TableA and TERM_B column of TableB with sql on Oracle 10. My result table should be like that : Result_Table ID | INTERSECT_TERMS How can I do that? 回答1: The INTERSECT operator returns a resultset containing the matching values from the two queries. select * from tableA where term_a in ( select

问题 I'm having some problems with INTERSECT command . Hope someone could help me. I want to get the the movieid that appears in the first and second SELECT . After that I want to use these data (that could be in a LIMIT of 10) to receive the titles of the movie in another table. Something like this, but I'm not doing right: SELECT movieid FROM ratings WHERE votes > 0 INTERSECT SELECT movieid FROM genres WHERE genre = '$_SESSION[genero]' In this case I should get the movied that appear both on

问题 So I understand that I'm not coding this the best way possible at the moment; this is a sort of test run. What I'm trying to do is wall collisions using rectangles and the intersects property (sorry if I'm not using the correct terminology). So far I have 2 rectangles on screen. 1 the player controls and the other which the play is colliding with. When they collide the player stops moving. The problem is that if the player is trying to move into the rectangle while they are already colliding