Tutorial by Examples: nd

NSE functions should be used in interactive programming. However, when developping new functions in a new package, it's better to use SE version. Load dplyr and lazyeval : library(dplyr) library(lazyeval) Filtering NSE version filter(mtcars, cyl == 8) filter(mtcars, cyl < 6) filter(mtca...

A simple way to catch unhandled errors (exceptions) in a VFP application is to use the ON ERROR command near the beginning of your main program. The following ON ERROR command calls a method in the current program called "errorHandler". The values returned by ERROR (the VFP Error Number),...

While the JCE secures cryptographic operations and key generation, it is up to the developer to actually manage their keys. More information needs to be provided here. One commonly-accepted best practice for handling keys at runtime is to store them only as byte arrays, and never as strings. This i...

Needs content For most applications, the java.utils.Random class is a perfectly fine source of "random" data. If you need to choose a random element from an array, or generate a random string, or create a temporary "unique" identifier, you should probably use Random. However, m...

More information needed. A cryptographic hash function is a member of a class of functions with three vital properties; consistency, uniqueness, and irreversibility. Consistency: Given the same data, a hash function will always return the same value. That is, if X = Y, f(x) will always equal f(y) ...

navigator.mediaDevices is the common method adapted in Chrome and FF to getUserMedia as of now. A promised based call back which returns local stream on success navigator.mediaDevices.getUserMedia({ audio: true, video: true }) .then(stream => { // attach this stream to window obje...

GTKWave is a fully feature graphical viewing package that supports several graphical data storage standards, but it also happens to support VCD, which is the format that vvp will output. So, to pick up GTKWave, you have a couple options Goto http://gtkwave.sourceforge.net/gtkwave.zip and downloa...

This example uses Icarus and GTKWave. Installation instructions for those tools on OSx are provided elsewhere on this page. Lets begin with the module design. This module is a BCD to 7 segment display. I have coded the design in an obtuse way simply to give us something that is easily broken and...

$data = array( array( 'id' => 'sku_123ABC', 'qty' => 1, 'price' => 39.95, 'name' => 'T-Shirt', 'options' => array('Size' => 'L', 'Color' => 'Red') ), array( 'id' =>...

This example is based on this post: TensorFlow - numpy-like tensor indexing. In Numpy you can use arrays to index into an array. E.g. in order to select the elements at (1, 2) and (3, 2) in a 2-dimensional array, you can do this: # data is [[0, 1, 2, 3, 4, 5], # [6, 7, 8, 9, 10, 11], # ...

Grab installer from http://scons.org/pages/download.html Or try pip installation tool that comes with Python: pip install scons If scons still can't be found after that, make sure that Python Scripts/ folder is added to PATH for your Python installation.

func sampleWithCompletion(completion:@escaping (()-> ())){ let delayInSeconds = 1.0 DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + delayInSeconds) { completion() } } //Call the function sampleWithCompletion { print("after on...

enum ReadResult{ case Successful case Failed case Pending } struct OutpuData { var data = Data() var result: ReadResult var error: Error? } func readData(from url: String, completion: @escaping (OutpuData) -> Void) { var _data = OutpuData(data: Data(), ...

This shows you how to use Microsoft.Extensions.DependencyInjection nuget package without the use of the WebHostBuilder from kestrel (e.g. when you want to build something else then a webApp): internal class Program { public static void Main(string[] args) { var services = new Se...

IServiceCollection To start building an IOC container with Microsoft's DI nuget package you start with creating an IServiceCollection. You can use the already provided Collection: ServiceCollection: var services = new ServiceCollection(); This IServiceCollection is nothing more than an implemen...

class MainMenuListView; class MainWindow : public QMainWindow { Q_OBJECT public: MainWindow(QWidget* parent = 0); ~MainWindow(); private: MainMenuListView* menuA; MainMenuListView* menuB; MainMenuListView* menuC; };

tf.gather_nd is an extension of tf.gather in the sense that it allows you to not only access the 1st dimension of a tensor, but potentially all of them. Arguments: params: a Tensor of rank P representing the tensor we want to index into indices: a Tensor of rank Q representing the indices into ...

Eclipse can generate basic getters and setters for you. Right click in you class file and go to Source - Generate Getters and Setters (ALT+SHIFT+S). This will open a dialog where you can choose which fields you would like to have getters and setters generated for.

QtCreator is, at the moment, the best tool to create a Qt application. In this example, we will see how to create a simple Qt application which manage a button and write text. To create a new application click on File->New File or Project: Then choose the Projects->Application->Qt Widge...

Commands: expdp <bkpadmin>/<bkp123> parfile=<exp.par> *Please replace the data in <> with appropriate values as per your environment. You can add/modify parameters as per your requirements. In the above example all the remaining parameters are added in parameter files as...