{"id":20222,"date":"2022-11-09T02:16:45","date_gmt":"2022-11-08T20:46:45","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-c-optimize-logic-closed\/"},"modified":"2022-11-09T02:16:45","modified_gmt":"2022-11-08T20:46:45","slug":"solved-c-optimize-logic-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-c-optimize-logic-closed\/","title":{"rendered":"[Solved] C# – optimize logic [closed]"},"content":{"rendered":"

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Your question is not well-phrased. If your elem1<\/code> or elem2<\/code> is a single item you want to compare against, this is pretty easy. Just do a LINQ Where<\/code> to find the items that match the criteria.<\/p>\n

Coordinates it = new Coordinates { lat = 5, lon = 5 };\nvar picked = list.Where(x => Math.Abs(x.lat - it.lat) < Delta && Math.Abs(x.lon - it.lon) < Delta);\n<\/code><\/pre>\n
If, on the other hand, your two elements are any two elements in the list, then you run into a problem where you need to clarify things. As I mentioned in my comment, if your have elem1<\/code>, elem2<\/code>, and elem3<\/code>, and if the first two don’t match the criteria but if elem2<\/code> and elem3<\/code> do match the criteria, then are both of those elements (2 and 3) ‘hits’? Assuming they are, the solution below will work. I wrote a simple Comparer to help make things easy as well.<\/p>\n
public class CoordinateComparer : IEqualityComparer<Coordinates>\n{\n    public bool Equals(Coordinates x, Coordinates y)\n    {\n        return (x.lat == y.lat && x.lon == y.lon);\n    }\n\n    public int GetHashCode(Coordinates obj)\n    {\n        unchecked\n        {\n            int hash = 17;\n            if (obj != null)\n            {\n                hash = hash * 23 + obj.lat.GetHashCode();\n                hash = hash * 23 + obj.lon.GetHashCode();\n            }\n            return hash;\n        }\n    }\n}\n\npublic class Coordinates\n{\n    public int lat { get; set; }\n    public int lon { get; set; }\n}\n\nclass MainClass\n{\n    public static void Main(string[] args)\n    {\n        List<Coordinates> list = new List<Coordinates>();\n        list.Add(new Coordinates { lat = 5, lon = 4 }); \n        list.Add(new Coordinates { lat = 4, lon = 5 });\n        list.Add(new Coordinates { lat = 7, lon = 4 });\n        list.Add(new Coordinates { lat = 6, lon = 3 });\n        list.Add(new Coordinates { lat = 8, lon = 2 });\n\n        double Delta = 1.1;\n\n        List<Coordinates> results = new List<Coordinates>();\n        foreach(Coordinates item in list)\n        {\n            \/\/ Find items that match the condition\n            var matches = list.Where(x => Math.Abs(x.lat - item.lat) < Delta && Math.Abs(x.lon - item.lon) < Delta);\n            \/\/ The 'item' will always match the condition with itself, which is undesirable, so remove it\n            matches = matches.Except(new List<Coordinates> { item }, new CoordinateComparer());\n            \/\/ Add the items that are not already in it to the results list\n            results.AddRange(matches.Where(x => !results.Contains(x, new CoordinateComparer())));\n        }\n\n        foreach (Coordinates item in results)\n            Console.WriteLine(\"Lat : {0}, Lon : {1}\", item.lat, item.lon);\n\n        Console.ReadLine();\n    }   \n}\n<\/code><\/pre>\n
Bear in mind that if your latitude and longitude coordinates are either double<\/code> or float<\/code>, which they probably are, you might run into problems when comparing. But that’s an altogether different question.<\/p>\n<\/p><\/div>\n
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            5<\/span> <\/p><\/div>\n<\/div>\n
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solved C# – optimize logic [closed] <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] Your question is not well-phrased. If your elem1 or elem2 is a single item you want to compare against, this is pretty easy. Just do a LINQ Where to find the items that match the criteria. Coordinates it = new Coordinates { lat = 5, lon = 5 }; var picked = list.Where(x => … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[352,324,578,540],"class_list":["post-20222","post","type-post","status-publish","format-standard","hentry","category-solved","tag-net","tag-c","tag-linq","tag-list"],"yoast_head":"\n[Solved] C# - optimize logic [closed] - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-c-optimize-logic-closed\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] C# - optimize logic [closed] - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Your question is not well-phrased. If your elem1 or elem2 is a single item you want to compare against, this is pretty easy. Just do a LINQ Where to find the items that match the criteria. Coordinates it = new Coordinates { lat = 5, lon = 5 }; var picked = list.Where(x => ... 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