intersection

问题 I have an input set of date ranges that may overlap. Instead of combining these overlapping date ranges, I want to create new date ranges with adjusted dates, e.g.: |---------------------–| |-----| |--------------–| should end up in: |-------|---|-|--------|----| Is there an efficient way to solve this with Java? Thanks in advance! UPDATE: I didn't mention my own approach in my first question, so here it is: I'd simply take the start and the end date of an interval and add it to a sorted set.

问题 I have a bitmap where two large blocks of colors intersect, and I would like to find the intersection of these two blocks. Note that I do not know the actual geometry of the two shapes, because this is all just raw pixel data. Is there any algorithm I could use to do this? 回答1: If you have all the pixel data in memory (which I'd assume you do, but this is a major sticking point) and there are only two distinct colours, all you should need to do is run a horizontal scanline to find the point

问题 I'm working on determining relationships (boundary/interior intersections) between two 3D objects (triangular faces) and stumbled on Shapely, which I am interested in using instead of implementing my own point/segment/ray/triangle intersection functions. However, I'm running into the following problem: >>> from shapely.geometry import Polygon >>> poly = Polygon([(0,1,1),(1,-1,1),(-1,-1,1)]) >>> poly2 = Polygon([(0,1,0),(1,-1,0),(-1,-1,0)]) >>> poly.intersects(poly2) True >>> poly.equals(poly2

问题 Lets say you have a language L and you want to determine if it is context free. Context free languages intersected with regular languages are context free. Is that enough to prove that L is context free? Meaning, L intersect P = T Where P is a regular language and T is context free. Does this imply that L is context free? 回答1: No, your statement is not true. Consider the following counter-example: L = {0 n 1 n 2 n | n > 0}, P = T = Ø . Clearly we have L ∩ P = L ∩ Ø = Ø = T , and Ø is both

问题 I have been trying to get the intersection point of some 3D lines. The lines are represented in the form Line: s + t*r. The lines doesn't really intersect, so I would like to get the point in 3D that the distance from that point to all lines is minimum I found solutions for finding the intersection between two lines, but in my case, it is a set of lines, like 5 or more. I found a solution that represents the distance between the point a to line l: p+t*r (p is the start point, and r is the

问题 How can i do intersection in nhibernate? is select enterprise.Id from Enterprises intersect select enterpiseID from vEnterprise 回答1: http://www.hibernate.org/117.html#A21 It doesn't currently support union or intersect. _ You could use a named sql-query and do the union in raw SQL. NHibernate will be able to populate entity instances from the sql-query and return those as the query result. See here and here. 来源： https://stackoverflow.com/questions/3803325/nhibernate-intersection

问题 I am trying to see if an imagebox interacts with an e graphics line. my current code: e.Graphics.DrawLine(SystemPens.ButtonShadow, a, b); if (pictureBox1.Bounds.IntersectsWith(e.GraphicsLine.Bounds)) { dead(); } I am unsure how to do this. 回答1: To test for intersection of a rectangle and a line you can either use one of the many methods from the Wikipedia article or use a GDI+ trick involving GraphicsPaths and Regions ..: using System.Drawing.Drawing2D; .. bool Intersects(Point a, Point b,

问题 How to write in javascript(w/wth JQuery) to find values that intersect between arrays? It should be like var a = [1,2,3] var b = [2,4,5] var c = [2,3,6] and the intersect function should returns array with value {2}. If possible it could applicable for any number of arrays. Thanks 回答1: There are many ways to achieve this. Since you are using jQuery I will suggest use grep function to filter the value that are present in all three array. var a = [1, 2, 3] var b = [2, 4, 5] var c = [2, 3, 6]

问题 I am implementing hierarchical clustering using Jaccard distance. The transactions for which I am trying to find Jaccard are represented in binary. For eg.: t1=['0','1','1','0','1'] t2=['1','0','1','0','0'] . I looked at this SO question, which is very similar to what I want, but I am not getting the right answer. Basically this is what I am looking for: 1. find intersection and union for the above 2 lists. I have tried the below apart from looking at numerous other online resources: 1. s1

问题 I have a problem. I would like to intersect a quad with a quad. int main(){ typedef boost::geometry::model::point_xy<double> TBoostPoint; typedef boost::geometry::model::polygon<TBoostPoint> TBoostPoly; TBoostPoint point; TBoostPoly firstPoly, secondPoly; boost::geometry::read_wkt("POLYGON( (1.504477611940313, 3.761194029850755), (1.504477611940305, 3.573134328358203), (1.316417910447765, 3.573134328358206), (1.316417910447769, 3.761194029850752))", firstPoly); boost::geometry::read_wkt(