intersection

Intersecting two dictionaries in Python

由 爷，独闯天下 提交于 2019-11-26 22:26:27
I am working on a search program over an inverted index. The index itself is a dictionary whose keys are terms and whose values are themselves dictionaries of short documents, with ID numbers as keys and their text content as values. To perform an 'AND' search for two terms, I thus need to intersect their postings lists (dictionaries). What is a clear (not necessarily overly clever) way to do this in Python? I started out by trying it the long way with iter : p1 = index[term1] p2 = index[term2] i1 = iter(p1) i2 = iter(p2) while ... # not sure of the 'iter != end 'syntax in this case ... You

Finding Intersection of NSMutableArrays

由 余生长醉 提交于 2019-11-26 22:20:50
I have three NSMutableArray containing names that are added to the lists according to different criterieas. Here are my arrays pseudocode: NSMutableArray *array1 = [@"Jack", @"John", @"Daniel", @"Lisa"]; NSMutableArray *array2 = [@"Jack", @"Bryan", @"Barney", @"Lisa",@"Penelope",@"Angelica"]; NSMutableArray *array3 = [@"Jack", @"Jerome", @"Dan", @"Lindsay", @"Lisa"]; I want to find a fourth array which includes the intersection of those three arrays. In this case for example it will be: NSMutableArray *array4 = [@"Jack",@"Lisa"]; Because all the three array have jack and lisa as an element. Is

MongoDb use filter to match a list

由 痞子三分冷 提交于 2019-11-26 22:11:37
问题 I have a list of BsonDocument : var list = db.GetCollection<BsonDocument>(collectionName); var myIds = list.Find(_ => true) .Project(Builders<BsonDocument>.Projection.Include("_id")) .ToList(); that contains: myIds = "{ { "_id" : "cc9d9282-c9d2-4cba-a776-ffddsds274d5" }, { "_id" : "2c1ddd82-c9d2-4dda-afr6-d79ff1274d56" }, { "_id" : "ss969281-c9d2-4cba-a776-d79ffds274d5" } }" And want to query like this: var deleted =list.DeleteMany(Builders<MessageExchange>.Filter.In("_id", myIds)); I also

Line intersection with AABB Rectangle?

由 左心房为你撑大大i 提交于 2019-11-26 22:01:16
Preferably without using any kind of loop, as this'll be used in a game. I wish to intersect a line with a rectangle, of arbitrary size. But I also wish for the intersection point[s] to be returned. It's possible, I've done a little googling, but still have not worked it out. The line is defined using (x1,y1,x2,y2). The rectangle has these two points too. I would recommend simply doing a line-segment-line-segment intersection check on each line segment (edge) that makes up the rectangle. Here is a line segment intersection detection algorithm I wrote ages ago, dredged up from one of my old XNA

Find sets of disjoint sets from a list of tuples or sets in python

由 和自甴很熟 提交于 2019-11-26 21:58:36
问题 here is the problem: I have a list of tuples (could be sets as well if needed). For instance: a = [(1, 5), (4, 2), (4, 3), (5, 4), (6, 3), (7, 6)] What I want to find is a list r = [(1, 5, 4, 2, 3, 6, 7)] because the intersection is not empty once all the sets are put together. For the example a = [(1, 5), (4, 2), (4, 3), (5, 4), (6, 3), (7, 6), (8, 9)] the result should be r = [(1, 5, 4, 2, 3, 6, 7), (8, 9)] Hope the problem is clear. So what is the most elegant way to do this in python, if

What's the algorithm of 'set.intersection()' in python?

由 泪湿孤枕 提交于 2019-11-26 21:56:00
问题 First of all, my purpose is to randomly get only one element in both known sets. So my original method is firstly intersect two sets. And then randomly pick up a element from the intersected set. But this is foolish, because that I only need a elements but a intersected set. So I need to find the algorithm of set.intersection(). I compare the cost time between the methods of 'set.intersection()' and 'for{for{}}'. Set.intersection() is more faster than other one(100 times). So using 'for{for{}

Intersection of multiple arrays in PostgreSQL

由 此生再无相见时 提交于 2019-11-26 21:23:47
问题 I have a view defined as: CREATE VIEW View1 AS SELECT Field1, Field2, array_agg(Field3) AS AggField FROM Table1 GROUP BY Field1, Field2; What I would like to do is get the intersection of the arrays in AggField with something like: SELECT intersection(AggField) FROM View1 WHERE Field2 = 'SomeValue'; Is this at all possible, or is there a better way to achieve what I want? 回答1: The closest thing to an array intersection that I can think of is this: select array_agg(e) from ( select unnest(a1)

Efficiently finding the intersection of a variable number of sets of strings

由 不羁的心 提交于 2019-11-26 20:46:15
I have a variable number of ArrayList's that I need to find the intersection of. A realistic cap on the number of sets of strings is probably around 35 but could be more. I don't want any code, just ideas on what could be efficient. I have an implementation that I'm about to start coding but want to hear some other ideas. Currently, just thinking about my solution, it looks like I should have an asymptotic run-time of Θ(n 2 ). Thanks for any help! tshred Edit: To clarify, I really just want to know is there a faster way to do it. Faster than Θ(n 2 ). Set.retainAll() is how you find the

Java 8 Lambda - Intersection of Two Lists

由 生来就可爱ヽ(ⅴ＜●) 提交于 2019-11-26 19:57:03
问题 I am trying to find intersection of two lists based on some condition and doing some steps. Couldn't find a way to do it (in learning stage) :) Double totalAmount = 0.00d; Double discount = 0.00d; List<OrderLineEntry> orderLineEntryList = orderEntry.getOrderReleases().stream() .flatMap(orderReleaseEntry -> orderReleaseEntry.getOrderLines().stream()) .filter(orderLineEntry -> orderLineEntry.getStatus().equals("PP") || orderLineEntry.getStatus().equals("PD")) .collect(Collectors.toList()); for

Test if two lines intersect - JavaScript function

由 末鹿安然 提交于 2019-11-26 19:09:58
问题 I've tried searching for a javascript function that will detect if two lines intersect each other. The function will take the x,y values of both the start end points for each line (we'll call them line A and line B). Is to return true if they intersect, otherwise false. Example of the function. I'm happy if the answer uses a vector object instead. Function isIntersect (lineAp1x, lineAp1y, lineAp2x, lineAp2y, lineBp1x, lineBp1y, lineBp2x, lineBp2y) { // JavaScript line intersecting test here.
订阅 intersection