Tutorial by Examples: o

Compute and Verify Digital Signatures

To compute a signature: final PrivateKey privateKey = keyPair.getPrivate(); final byte[] data = "FOO BAR".getBytes(); final Signature signer = Signature.getInstance("SHA1withRSA"); signer.initSign(privateKey); signer.update(data); final byte[] signature = signer.sign();...

Java Language • Security & Cryptography

Kubectl in command line

After you have a running cluster you can manage it with the kubectl command. Most of the commands you can get with the kubectl --help command, but I show you the most common commands, for manage and getting info about your cluster, nodes, pods, services and labels. For getting information about t...

kubernetes • Getting started with kubernetes

Examining assoc arrays

All needed usage shown with this snippet: #!/usr/bin/env bash declare -A assoc_array=([key_string]=value \ [one]="something" \ [two]="another thing" ...

Bash • Associative arrays

Longest Increasing Subsequence Basic Information

The Longest Increasing Subsequence problem is to find subsequence from the give input sequence in which subsequence's elements are sorted in lowest to highest order. All subsequence are not contiguous or unique. Application of Longest Increasing Subsequence: Algorithms like Longest Increasing Subs...

algorithm • Longest Increasing Subsequence

C# Implementation

public class LongestIncreasingSubsequence { private static int Lis(int[] input, int n) { int[] lis = new int[n]; int max = 0; for(int i = 0; i < n; i++) { lis[i] = 1; } for (int i = 1; i < n; i++) { ...

algorithm • Longest Increasing Subsequence

"Loading section/notification" during AJAX request

Blog.html <div data-bind="visible: isLoading()"> Loading... </div> <div data-bind="visible: !isLoading(), foreach: blogs"> <br /> <span data-bind="text: entryPostedDate"></span> <br /> <h3> ...

knockout.js • AJAX requests and binding

Pan, zoom, and rotate with QGraphicsView

QGraphics can be used to organize complicated scenes of visual objects into a framework that makes them easier to handle. There are three major types of objects used in this framework QGraphicsView, QGraphicsScene, and QGraphicsItems. QGraphicsItems are the basic visual items that exist in the scen...

Qt • QGraphics

2. String Manipulation Basics

'Base string Dim exStr : exStr = " <Head>data</Head> " 'Left Dim res: res = Left(exStr,6) 'res now equals " <Head" 'Right Dim res: res = Right(exStr,6) 'res now equals "Head> " 'Mid Dim res: res = Mid(exStr,8,4) 'res now equals "data&quot...

vbscript • Strings

5. Populating array with specific text from string via start and end characters.

'Note: I use this method to extract non-html data in extracted GET telnet results 'This example effectively grabs every other vehicle that have start and finish 'characters, which in this case is "/". 'Resulting in an array like this: 'extractedData(0) = "/Jeep" 'extractedD...

vbscript • Strings

4. Chaining string manipulation methods together.

Dim exStr : exStr = " <Head>data</Head> " Dim res res = Ucase(Replace(Mid(exStr, instr(exStr, ">")+1,4), "ata", "ark")) 'res now equals DARK 'instr(exStr, ">") returns 7 'Mid(" <Head>data</Head> ", 7+1,...

vbscript • Strings

3. Arrays - Multi-Dimensional

Dim mdArray(2,3) mdArray(0, 0) = "test1" mdArray(0, 1) = "test2" mdArray(0, 2) = "test3" mdArray(0, 3) = "test4" mdArray(1, 0) = "test5" mdArray(1, 1) = "test6" mdArray(1, 2) = "test7" mdArray(1, 3) = "test8" md...

vbscript • Arrays and Loops

4. Arrays - Multi-Dimensional - Dynamic

Dim mddArray() ReDim mddArray(0) Dim ti, testinc: testinc = "test": ti = 1 For i = 0 To 4 Dim tmpArray(): ReDim tmpArray(0) For j = 0 To 3 tmpArray(UBound(tmpArray)) = testinc & ti ti = ti + 1 ReDim Preserve tmpArray(UBound(tmpArray) + 1) Ne...

vbscript • Arrays and Loops

createDissolvedGDB to create a file gdb on the workspace

def createDissolvedGDB(workspace, gdbName): gdb_name = workspace + "/" + gdbName + ".gdb" if(arcpy.Exists(gdb_name): arcpy.Delete_management(gdb_name) arcpy.CreateFileGDB_management(workspace, gdbName, "") else: arcpy.CreateFi...

Python Language • ArcPy

Configure Macros in a Project

In the build.sbt file (or where the project is defined if it is in another location), add the following setting: scalacOptions += "-language:experimental.macros" For instance, a project might be defined like this: lazy val main = project.in(file(".")) // root project .se...

sbt • Projects

Using the PROMPT_COMMAND envrionment variable

When the last command in an interactive bash instance is done, the evaluated PS1 variable is displayes. Before actually displaying PS1 bash looks whether the PROMPT_COMMAND is set. This value of this var must be a callable program or script. If this var is set this program/script is called BEFORE th...

Bash • Handling the system prompt

Hello World (getting site title)

2013 SharePoint 2013 and newer versions are 64-bit only and so the assembly/program needs to be also built for 64-bit processor. Right after your project is created it is necessary to swich the Platform target from Any CPU to x64 otherwise error will occure. using System; using Microsoft.Share...

sharepoint • Working with Managed Server Side Object Model (full-trust)

Async Initialization

Using async initialization is a recommended way for application development. It uses the OpenCV Manager to access OpenCV libraries externally installed in the target system. Code snippet implementing the async initialization: public class MainActivity extends Activity implements CvCameraViewListen...

opencv • OpenCV initialization in Android

Static Initialization

According to this approach all OpenCV binaries are included into your application package. It is designed mostly for development and debugging purposes. This approach is deprecated for the production code, async initialization is recommended. If your application project doesn’t have a JNI part, jus...

opencv • OpenCV initialization in Android

Advanced features of Exceptions

This example covers some advanced features and use-cases for Exceptions. Examining the callstack programmatically Java SE 1.4 The primary use of exception stacktraces is to provide information about an application error and its context so that the programmer can diagnose and fix the problem. Som...

Java Language • Exceptions and exception handling

Using BigDecimal instead of float

Due to way that the float type is represented in computer memory, results of operations using this type can be inaccurate - some values are stored as approximations. Good examples of this are monetary calculations. If high precision is necessary, other types should be used. e.g. Java 7 provides Big...

Java Language • BigDecimal