intersect

I am working with shapefiles in R , one is point.shp the other is a polygon.shp. Now, I would like to intersect the points with the polygon, meaning that all the values from the polygon should be attached to the table of the point.shp. I tried overlay() and spRbind in package sp, but nothing did what I expected them to do. Could anyone give me a hint? Spacedman If you do overlay(pts, polys) where pts is a SpatialPointsDataFrame object and polys is a SpatialPolygonsDataFrame object then you get back a vector the same length as the points giving the row of the polygons data frame. So all you

I have two Ruby arrays, and I need to see if they have any values in common. I could just loop through each of the values in one array and do include?() on the other, but I'm sure there's a better way. What is it? (The arrays both hold strings.) Thanks. Mark Byers Set intersect them: a1 & a2 Here's an example: > a1 = [ 'foo', 'bar' ] > a2 = [ 'bar', 'baz' ] > a1 & a2 => ["bar"] > !(a1 & a2).empty? # Returns true if there are any elements in common => true Jean Any value in common ? you can use the intersection operator : & [ 1, 1, 3, 5 ] & [ 1, 2, 3 ] #=> [ 1, 3 ] If you are looking for a full

I've been searching for an answer for hours but have trouble finding anything on the topic. I have a question related to Objective-c. I'm making an application in which a UIView checks for touches from the user and if the user touches and moves his/her finger, a path using UIBezierPath is drawn. If the user draws so that the path intersects itself it should disappear from the screen. When the user is done drawing the pattern, a line from the last point in the path should connect with the first point in the path automatically (I'm using the method "closePath" for this), if this line intersects

Long story short: I have 2 collections of objects. One contains good values (Let's call it "Good"), the other default values (Mr. "Default"). I want the Intersect of the Union between Good and Default, and Default. In other words: Intersect(Union(Good, Default), Default). One might think it resolves as Default, but here is where it gets tricky : I use a custom IEqualityComparer. I got the following classes : class MyClass { public string MyString1; public string MyString2; public string MyString3; } class MyEqualityComparer : IEqualityComparer<MyClass> { public bool Equals(MyClass item1,

I've got a class: class ThisClass { private string a {get; set;} private string b {get; set;} } I would like to use the Intersect and Except methods of Linq, i.e.: private List<ThisClass> foo = new List<ThisClass>(); private List<ThisClass> bar = new List<ThisClass>(); Then I fill the two lists separately. I'd like to do, for example (and I know this isn't right, just pseudo code), the following: foo[a].Intersect(bar[a]); How would I do this? Maybe // returns list of intersecting property 'a' values foo.Select(f => f.a).Intersect(bar.Select(b => b.a)); BTW property a should be public. If you

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 the items that are missing when comparing two collections: // Assign two arrays. int[] array1 = { 1, 2, 3 }; int[] array2 = { 2, 3, 4 }; // Call Intersect extension method. var intersect =