Tutorial by Examples: d

Extract fasta sequences from a nucl blastdb

You can extract fasta sequence from a blastdb constructed from a fasta file using blastdbcmd which should be installed when you install makeblastdb. blastdbcmd -entry all -db <database label> -out <outfile> If you had a database called my_database which contained the files my_databas...

bioinformatics • BLAST

[[maybe_unused]]

The [[maybe_unused]] attribute is created for indicating in code that certain logic might not be used. This if often linked to preprocessor conditions where this might be used or might not be used. As compilers can give warnings on unused variables, this is a way of suppressing them by indicating in...

C++ • Attributes

Install local development version of a package

While working on the development of an R package it is often necessary to install the latest version of the package. This can be achieved by first building a source distribution of the package (on the command line) R CMD build my_package and then installing it in R. Any running R sessions with p...

R Language • Installing packages

ROLAP aggregation (Data Mining)

Description The SQL standard provides two additional aggregate operators. These use the polymorphic value "ALL" to denote the set of all values that an attribute can take. The two operators are: with data cube that it provides all possible combinations than the argument attributes o...

SQL • GROUP BY

Character code

The method charCodeAt retrieves the Unicode character code of a single character: var charCode = "µ".charCodeAt(); // The character code of the letter µ is 181 To get the character code of a character in a string, the 0-based position of the character is passed as a parameter to charCo...

JavaScript • Strings

Background images

Full width table cell background images <html xmlns:v="urn:schemas-microsoft-com:vml"> <head> <style> v:* { behavior: url(#default#VML); display: inline-block; } </style> </head> <body> <center> <...

email • HTML email composition and Outlook intricacies

Create and Update Patches

Create new patches with hg qnew patch-name and then update them with new changes with hg qrefresh: hg qnew myFirstPatch // Creates a new patch called "myFirstPatch" ... // Edit some files hg qrefresh // Updates "myFirstPatch" with changes hg qnew ...

mercurial • Mercurial Queues

Push and Pop Patches

Pushing a patch applies the patch to the repository while poping a patch unapplies the patch from the repository. Pop the current patch off the queue with hg qpop and push it back onto the queue with hg qpush: hg qpop hg qpush Pop all patches: hg qpop -a PUsh all patches: hg qpush -a ...

mercurial • Mercurial Queues

Fold/Combine Patches

To fold (combine) two patches: hg qnew firstPatch // Create first patch hg qnew secondPatch // Create second patch hg qpop // Pop secondPatch hg qfold secondPatch // Fold secondPatch with firstPatch

mercurial • Mercurial Queues

Commands

qnew: create a new patch qpop: pop the current patch off the stack qpush: push the next patch onto the stack qrefresh: update the current patch qapplied: print the patches already applied qseries: print the entire series file qfinish: move applied patches into repository history qdelete: re...

mercurial • Mercurial Queues

Extending Behat with Mink

Mink provides an interface for web drivers (like Goutte and Selenium) as well as a MinkContext which, when extended, provides additional web language for our steps. To install Mink (and the default Goutte driver): $ composer require --dev behat/mink-extension="^2.0" $ composer require -...

behat • Getting started with behat

Testing JavaScript with Mink and Selenium

If we want to test JavaScript on a website, we'll need to use something a bit more powerful than Goutte (which is just cURL via Guzzle). There are a couple of options such as ZombieJS, Selenium and Sahi. For this example I'll use Selenium. First you'll need to install the drivers for Mink: $ compo...

behat • Getting started with behat

Pass data through the middleware chain

From documentation: The HttpContext.Items collection is the best location to store data that is only needed while processing a given request. Its contents are discarded after each request. It is best used as a means of communicating between components or middleware that operate at different poi...

asp.net-core • Middleware

Wheel Collider

The wheel collider inside unity is built upon Nvidia's PhysX wheel collider, and therefore shares many similar properties. Technically unity is a "unitless" program, but to make everything make sense, some standard units are required. Basic Properties Mass - the weight of the wheel in ...

unity3d • Collision

Understanding Django 1.10 middleware's new style

Django 1.10 introduced a new middleware style where process_request and process_response are merged together. In this new style, a middleware is a callable that returns another callable. Well, actually the former is a middleware factory and the latter is the actual middleware. The middleware facto...

Django • Middleware

DateTimeField

DateTimeField is used to store date time values. class MyModel(models.Model): start_time = models.DateFimeField(null=True, blank=True) created_on = models.DateTimeField(auto_now_add=True) updated_on = models.DateTimeField(auto_now=True) A DateTimeField has two optional parameters:...

Django • Model Field Reference

Evaluating Regular Expressions with a Predicate Function

The predicate function matches can be used to evaluate strings on the fly without use of any object declarations. IF matches( val = 'Not a hex string' regex = '[0-9a-f]*' ). cl_demo_output=>display( 'This will not display' ). ELSEIF matches( val = '6c6f7665' reg...

ABAP • Regular Expressions

Pitfall - Catching InterruptedException

As already pointed out in other pitfalls, catching all exceptions by using try { // Some code } catch (Exception) { // Some error handling } Comes with a lot of different problems. But one perticular problem is that it can lead to deadlocks as it breaks the interrupt system when writ...

Java Language • Java Pitfalls - Exception usage

Pitfall - Leaving out braces: the "dangling if" and "dangling else" problems

The latest version of the Oracle Java style guide mandates that the "then" and "else" statements in an if statement should always be enclosed in "braces" or "curly brackets". Similar rules apply to the bodies of various loop statements. if (a) { //...

Java Language • Java Pitfalls - Language syntax

Introduction

Solr is a standalone enterprise search server with a REST-like API. You put documents in it (called "indexing") via JSON, XML, CSV or binary over HTTP. You query it via HTTP GET and receive JSON, XML, CSV or binary results. Solr uses the Lucene search library and extends it. Here are som...

solr • Getting started with solr