Tutorial by Examples: r

Writing a gzipped file To write a gzipped file, use the module IO::Compress::Gzip and create a filehandle by creating a new instance of IO::Compress::Gzip for the desired output file: use strict; use warnings; use open qw( :encoding(UTF-8) :std ); # Make UTF-8 default encoding use IO::Compres...

HTML DOM is Expensive Each web page is represented internally as a tree of objects. This representation is called Document Object Model. Moreover, it is a language-neutral interface that allows programming languages (such as JavaScript) to access the HTML elements. In other words The HTML DOM...

Generating the minimum number of operations to transform one tree into another have a complexity in the order of O(n^3) where n is the number of nodes in the tree. React relies on two assumptions to solve this problem in a linear time - O(n) Two components of the same class will generate sim...

When two nodes are not of the same type, React doesn't try to match them - it just removes the first node from the DOM and inserts the second one. This is why the first tip says If you see yourself alternating between two components classes with very similar output, you may want to make it the sa...

Recommended way to install Slim framework is by using composer. Create an empty directory This directory will contain all required files for our Slim application to run. We call this directory root directory so we can address all other application files and directories relative to root directo...

ContactManager contactManager = Factory.CreateObject("tracking/contactManager", true) as ContactManager; Contact contact = contactManager.LoadContactReadOnly(userName); return contact;

Sometimes, it's better to have only three options style="@android:style/TextAppearance.Small" style="@android:style/TextAppearance.Medium" style="@android:style/TextAppearance.Large" Use small and large to differentiate from normal screen size. <TextView ...

url: /api/data/v8.0/quotedetails json: { "[email protected]": "/products(11c0dbad-91df-e311-b8e5-6c3be5a8b200)", "[email protected]" : "/quotes(69b5e1ae-037f-e611-80ed-fc15b428dcdc)", "[email protected]" : "/uoms(73a5daea-6dd...

When you use GROUP BY clause, SQL Server query optimizer (QO) can choose different types of grouping operators: HASH Aggregate that creates hash-map for grouping entries Stream Aggregate that works well with pre-ordered inputs You can explicitly require that QO picks one or another aggregate ...

Specifies that the query is optimized for fast retrieval of the first number_rows. This is a nonnegative integer. After the first number_rows are returned, the query continues execution and produces its full result set. select OrderID, AVG(Quantity) from Sales.OrderLines group by OrderID OPTION ...

By using the method GET_SUBMATCH of class CL_ABAP_MATCHER, we can get the data in the groups/subgroups. Goal: get the token to the right of the keyword 'Type'. DATA: lv_pattern TYPE string VALUE 'type\s+(\w+)', lv_test TYPE string VALUE 'data lwa type mara'. CREATE OBJECT ref_regex EX...

JSON_MODIFY has 'append' mode that appends value into array. declare @json nvarchar(4000) = N'{"Id":1,"Name":"Toy Car","Tags":["toy","game"]}' set @json = JSON_MODIFY(@json, 'append $.Tags', 'sales') print @json -- Output: {"Id&quot...

JSON_MODIFY function enables you to insert JSON objects into JSON text: declare @json nvarchar(4000) = N'{"Id":1,"Name":"Toy Car"}' set @json = JSON_MODIFY(@json, '$.Price', JSON_QUERY('{"Min":34.99,"Recommended":45.49}'))...

You can generate JSON object using standard SELECT query with FOR JSON clause and insert it into JSON text as third parameter: declare @json nvarchar(4000) = N'{"Id":17,"Name":"WWI"}' set @json = JSON_MODIFY(@json, '$.tables', (select name fr...

You can generate JSON object using standard SELECT query with FOR JSON clause and WITHOUT_ARRAY_WRAPPER option, and insert it into JSON text as a third parameter: declare @json nvarchar(4000) = N'{"Id":17,"Name":"WWI"}' set @json = JSON_MODIFY(@json, '$.table', ...

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1. Bagged Decision Trees Bagging performs best with algorithms that have high variance. A popular example are decision trees, often constructed without pruning. In the example below see an example of using the BaggingClassifier with the Classification and Regression Trees algorithm (DecisionTreeCl...

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