Tutorial by Examples: i

This is a sample HTTP client based on Ev extension. Ev extension implements a simple yet powerful general purpose event loop. It doesn't provide network-specific watchers, but its I/O watcher can be used for asynchronous processing of sockets. The following code shows how HTTP requests can be sche...

//integer (not really needed unless you need to round numbers, Excel with use default cell properties) worksheet.Cells["A1:A25"].Style.Numberformat.Format = "0"; //integer without displaying the number 0 in the cell worksheet.Cells["A1:A25"].Style.Numberformat.Form...

Detailed instructions on getting javafx-8 set up or installed.

//default DateTime patterns worksheet.Cells["A1:A25"].Style.Numberformat.Format = DateTimeFormatInfo.CurrentInfo.ShortDatePattern; //custom DateTime patters worksheet.Cells["A1:A25"].Style.Numberformat.Format = "dd-MM-yyyy HH:mm"; //or overwrite the patterns in ...

The ApplicationData.Current.LocalFolder api allows us to get access to the application cache : var file = await ApplicationData.Current.LocalFolder.CreateFileAsync("myFile.dat", CreationCollisionOption.ReplaceExisting); The FileIO class contains a set of utility methods to easily add d...

Anonymous pipes, or simply pipes, are kernel-managed objects exposed to processes as a pair of file descriptors, one for the read terminus and one for the write terminus. They are created via the pipe(2) function: int pipefds[2]; int result; result = pipe(pipefds); On success, pipe() record...

File descriptors and FILE objects are per-process resources that cannot themselves be exchanged between processes via ordinary I/O. Therefore, in order for two distinct processes to communicate via an anonymous pipe, one or both participating processes must inherit an open pipe end from the process...

Connecting two child processes via a pipe is performed by connecting each of two children to the parent via different ends of the same pipe. Usually, the parent will not be party to the conversation between the children, so it closes its copies of both pipe ends. int demo() { int pipefds[2]; ...

A shell-style pipeline consists of two or more processes, each one with its standard output connected to the standard input of the next. The output-to-input connections are built on pipes. To establish a pipeline-like set of processes, one creates pipe-connected child processes as described in ano...

cURL can keep cookies received in responses for use with subsequent requests. For simple session cookie handling in memory, this is achieved with a single line of code: curl_setopt($ch, CURLOPT_COOKIEFILE, ""); In cases where you are required to keep cookies after the cURL handle is de...

Example of creating an empty HashTable: $hashTable = @{} Example of creating a HashTable with data: $hashTable = @{ Name1 = 'Value' Name2 = 'Value' Name3 = 'Value3' }

$hashTable = @{ Key1 = 'Value1' Key2 = 'Value2' } foreach($key in $hashTable.Keys) { $value = $hashTable.$key Write-Output "$key : $value" } #Output Key1 : Value1 Key2 : Value2

An example, to add a "Key2" key with a value of "Value2" to the hash table, using the addition operator: $hashTable = @{ Key1 = 'Value1' } $hashTable += @{Key2 = 'Value2'} $hashTable #Output Name Value ---- -----...

The cluster library contains the ruspini data - a standard set of data for illustrating cluster analysis. library(cluster) ## to get the ruspini data plot(ruspini, asp=1, pch=20) ## take a look at the data hclust expects a distance matrix, not the original data. We ...

With hierarchical clustering, outliers often show up as one-point clusters. Generate three Gaussian distributions to illustrate the effect of outliers. set.seed(656) x = c(rnorm(150, 0, 1), rnorm(150,9,1), rnorm(150,4.5,1)) y = c(rnorm(150, 0, 1), rnorm(150,0,1), rnorm(150,5,1)) ...

Intervention Image is an open source PHP image handling and manipulation library. It provides an easier and expressive way to create, edit, and compose images and supports currently the two most common image processing libraries GD Library and Imagick. Read more about this here

Arrow functions will throw a TypeError when used with the new keyword. const foo = function () { return 'foo'; } const a = new foo(); const bar = () => { return 'bar'; } const b = new bar(); // -> Uncaught TypeError: bar is not a constructor...

Let df = pd.DataFrame({'col_1':['A','B','A','B','C'], 'col_2':[3,4,3,5,6]}) df # Output: # col_1 col_2 # 0 A 3 # 1 B 4 # 2 A 3 # 3 B 5 # 4 C 6 To get the distinct values in col_1 you can use Series.unique() df['col_1'].unique() # Output: ...

Parallel extensions have been introduced along with the Task Parallel Library to achieve data Parallelism. Data parallelism refers to scenarios in which the same operation is performed concurrently (that is, in parallel) on elements in a source collection or array. The .NET provides new constructs t...

When you execute scala in a terminal without additional parameters it opens up a REPL (Read-Eval-Print Loop) interpreter: nford:~ $ scala Welcome to Scala 2.11.8 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_66). Type in expressions for evaluation. Or try :help. scala> The REPL allows ...