Tutorial by Examples: o

from scipy.stats import rv_continuous import numpy class Neg_exp(rv_continuous): def _cdf(self, x, lamda): return 1-numpy.exp(-lamda*x) neg_exp = Neg_exp(name="Negative exponential", a=0) print (neg_exp.pdf(0,.5)) print (neg_exp.pdf(5,.5)) print (neg_exp.cdf(5...

There are many reasons a write operation may fail. A frequent one is because your security rules reject the operation, for example because you're not authenticated (by default a database can only be accessed by an authenticated user). You can see these security rule violations in the output of your...

SQL Server 2008 The ROW_NUMBER function can assign an incrementing number to each row in a result set. Combined with a Common Table Expression that uses a BETWEEN operator, it is possible to create 'pages' of result sets. For example: page one containing results 1-10, page two containing results 11...

SQL Server 2012 The OFFSET FETCH clause implements pagination in a more concise manner. With it, it's possible to skip N1 rows (specified in OFFSET) and return the next N2 rows (specified in FETCH): SELECT * FROM sys.objects ORDER BY object_id OFFSET 40 ROWS FETCH NEXT 10 ROWS ONLY The ORDER...

In earlier versions of SQL Server, developers had to use double sorting combined with the TOP keyword to return rows in a page: SELECT TOP 10 * FROM ( SELECT TOP 50 object_id, name, type, create_date FROM sys.objects ORDER BY name ASC ) AS data ...

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...

There are two equivalent ways to calculate the amount of time unit between two LocalTime: (1) through until(Temporal, TemporalUnit) method and through (2) TemporalUnit.between(Temporal, Temporal). import java.time.LocalTime; import java.time.temporal.ChronoUnit; public class AmountOfTime { ...

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;

This method doesn't require initialization of the tracker, which is handy if the state should be changed outside of the site context (for example in the shell). var stateManager = AutomationStateManager.Create(contact); automationStateManager.MoveToEngagementState(stateItem.ParentID, stateId); st...

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 ...

To handle a command, you must have a class that implements the CommandExecutor interface. The JavaPlugin class (your plugin's main class) already implements this. When implementing the CommandExecutor interface, the following method must be implemented: public boolean onCommand(CommandSender sende...

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 join two tables, SQL Server query optimizer (QO) can choose different types of joins that will be used in query: HASH join LOOP join MERGE join QO will explore plans and choose the optimal operator for joining tables. However, if you are sure that you know what would be the optimal ...

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 ...

When you use UNION operator on two query results, Query optimizer (QO) can use following operators to create a union of two result sets: Merge (Union) Concat (Union) Hash Match (Union) You can explicitly specify what operator should be used using OPTION() hint: select OrderID, OrderDate, Ex...

Specifies the max degree of parallelism for the query specifying this option. SELECT OrderID, AVG(Quantity) FROM Sales.OrderLines GROUP BY OrderID OPTION (MAXDOP 2); This option overrides the MAXDOP configuration option of sp_configure and Resource Governor. If MAXDOP is set to zero then...