Is there a “Group Box” equivalent in Java Swing?
Create a JPanel, and add your radiobuttons to it. Don’t forget to set the layout of the JPanel to something appropriate. Then call panel.setBorder(BorderFactory.createTitledBorder(name));
grouping
Group rows in an associative array of associative arrays by column value and preserve the original first level keys
$arr = array(); foreach ($old_arr as $key => $item) { $arr[$item[‘id’]][$key] = $item; } ksort($arr, SORT_NUMERIC);
Group list by values [duplicate]
values = set(map(lambda x:x[1], mylist)) newlist = [[y[0] for y in mylist if y[1]==x] for x in values]
Add separator to string at every N characters?
Regex.Replace(myString, “.{8}”, “$0,”); If you want an array of eight-character strings, then the following is probably easier: Regex.Split(myString, “(?<=^(.{8})+)”); which will split the string only at points where a multiple of eight characters precede it.
How to select the first row for each group in MySQL?
I based my answer on the title of your post only, as I don’t know C# and didn’t understand the given query. But in MySQL I suggest you try subselects. First get a set of primary keys of interesting columns then select data from those rows: SELECT somecolumn, anothercolumn FROM sometable WHERE id IN ( … Read more
Spark difference between reduceByKey vs. groupByKey vs. aggregateByKey vs. combineByKey
groupByKey: Syntax: sparkContext.textFile(“hdfs://”) .flatMap(line => line.split(” “) ) .map(word => (word,1)) .groupByKey() .map((x,y) => (x,sum(y))) groupByKey can cause out of disk problems as data is sent over the network and collected on the reduced workers. reduceByKey: Syntax: sparkContext.textFile(“hdfs://”) .flatMap(line => line.split(” “)) .map(word => (word,1)) .reduceByKey((x,y)=> (x+y)) Data are combined at each partition, with only … Read more
How to group subarrays by a column value?
There is no native one, just use a loop. $result = array(); foreach ($data as $element) { $result[$element[‘id’]][] = $element; }
How can I group data with an Angular filter?
You can use groupBy of angular.filter module. so you can do something like this: JS: $scope.players = [ {name: ‘Gene’, team: ‘alpha’}, {name: ‘George’, team: ‘beta’}, {name: ‘Steve’, team: ‘gamma’}, {name: ‘Paula’, team: ‘beta’}, {name: ‘Scruath’, team: ‘gamma’} ]; HTML: <ul ng-repeat=”(key, value) in players | groupBy: ‘team'”> Group name: {{ key }} <li ng-repeat=”player … Read more
using lodash .groupBy. how to add your own keys for grouped output?
You can do it like this in both Underscore and Lodash (3.x and 4.x). var data = [{ “name”: “jim”, “color”: “blue”, “age”: “22” }, { “name”: “Sam”, “color”: “blue”, “age”: “33” }, { “name”: “eddie”, “color”: “green”, “age”: “77” }]; console.log( _.chain(data) // Group the elements of Array based on `color` property .groupBy(“color”) // … Read more
Group a list of objects by an attribute
In Java 8: Map<String, List<Student>> studlistGrouped = studlist.stream().collect(Collectors.groupingBy(w -> w.stud_location));