Tutorial by Examples: ti

Depending on your target machine, you need to choose a supported ROS Version (or vice-versa). Although ROS installation is well documented in the ROS wiki, It might be confusing to find them. So, here's a table of the ROS Version, target platforms & architecture and the links for the appropriate...

After enabling and creating migrations there might be a need to initially fill or migrate data in your database. There are several possibilities but for simple migrations you can use the method 'Seed()' in the file Configuration created after calling enable-migrations. The Seed() function retrieves...

When run with no arguments, this program starts a TCP socket server that listens for connections to 127.0.0.1 on port 5000. The server handles each connection in a separate thread. When run with the -c argument, this program connects to the server, reads the client list, and prints it out. The clie...

Find f(n): nth Fibonacci number. The problem is quite easy when n is relatively small. We can use simple recursion, f(n) = f(n-1) + f(n-2), or we can use dynamic programming approach to avoid the calculation of same function over and over again. But what will you do if the problem says, Given 0 <...

Consider the following Java classes: class Foo { private Bar bar; public void foo() { bar.baz(); } } As can be seen, the class Foo needs to call the method baz on an instance of another class Bar for its method foo to work successfully. Bar is said to be a dependency for Foo sin...

The same examples as shown above with XML configuration can be re-written with Java configuration as follows. Constructor injection @Configuration class AppConfig { @Bean public Bar bar() { return new Bar(); } @Bean public Foo foo() { return new Foo(bar()); } } Property in...

Dependencies can be autowired when using the component scan feature of the Spring framework. For autowiring to work, the following XML configuration must be made: <context:annotation-config/> <context:component-scan base-package="[base package]"/> where, base-package is th...

Constructor injection through Java configuration can also utilize autowiring, such as: @Configuration class AppConfig { @Bean public Bar bar() { return new Bar(); } @Bean public Foo foo(Bar bar) { return new Foo(bar); } }

Objective-C Import the following to your ViewController #import <CoreImage/CoreImage.h> #import <CoreImage/CoreImage.h> #import <QuartzCore/QuartzCore.h> Call the function [self faceDetector]; Function definition: -(void)faceDetector { // Load the picture for face...

Data Visualization is an art of presenting the data in a manner that even a non-analyst can understand it. A perfect blend of aesthetic elements like colors, dimensions, labels can create visual masterpieces, hence revealing surprising business insights which in turn helps businesses to make informe...

POST https://analyticsreporting.googleapis.com/v4/reports:batchGet?access_token={Access token from auth request} { "reportRequests":[ { "viewId":"XXXX", "dateRanges":[ { "startDate":"2015-06-15", &q...

You can do a multiline doctest by using '...>' for the lines following the first iex> Foo.Bar.somethingConditional("baz") ...> |> case do ...> {:ok, _} -> true ...> {:error, _} -> false ...> end true

Instances have a lot of metadata that gets returned from a call to describe-instances, but often times you just want to see the basics. You can use a JMESPath query combined with table output to show concise instance information in an easily readable way. aws ec2 describe-instances --output table -...

Advanced functions behave the in the same way as cmdlets. The PowerShell ISE includes two skeletons of advanced functions. Access these via the menu, edit, code snippets, or by Ctrl+J. (As of PS 3.0, later versions may differ) Key things that advanced functions include are, built-in, customiz...

For example: You are going to migrate an existing column from non-required to required. In this case you might need to fill some default values in your migration for rows where the altered fields are actually NULL. In case the default value is simple (e.g. "0") you might use a default or d...

Pigeonhole Sort is a sorting algorithm that is suitable for sorting lists of elements where the number of elements (n) and the number of possible key values (N) are approximately the same. It requires O(n + Range) time where n is number of elements in input array and ‘Range’ is number of possible va...

Radix Sort is lower bound comparison based algorithm. It is a non-comparative integer sorting algorithm that sorts data with integer keys by grouping keys by individual digits which share some significant position and value. Radix sort is a linear time sorting algorithm that sort in O(n+k) time whe...

If you're creating an image, decoding an image, or resizing an image to fit the large notification image area, you can get the correct pixel dimensions like so: Resources resources = context.getResources(); int width = resources.getDimensionPixelSize(android.R.dimen.notification_large_icon_width)...

DBCC commands enable user to validate state of database. ALTER TABLE Table1 WITH NOCHECK ADD CONSTRAINT chkTab1 CHECK (Col1 > 100); GO DBCC CHECKCONSTRAINTS(Table1); --OR DBCC CHECKCONSTRAINTS ('Table1.chkTable1'); Check constraint is added with nocheck options, so it will not be ...

DBCC commands can show information about database objects. DBCC PROCCACHE Displays information in a table format about the procedure cache. DBCC OUTPUTBUFFER ( session_id [ , request_id ]) Returns the current output buffer in hexadecimal and ASCII format for the specified session_id (and o...