Java Design Patterns

Today i had the pleasure to present a session at the monthly Java User Group Malta meeting ... its always a pleasure to meet other Java Developers in our community and aspiring students. Click on the post tile to link to the presentation ...

Regards and good luck guys ... hope to meet again for other sessions.

Comments

Kenneth said…

Well done for the talk, Vince. Until the next!

June 28, 2008 at 2:16 PM

Interfacing C# .Net and R - Integrating the best of both worlds

In specific software areas like in quantitative finance or else in other mathematical domains, data centric programming typically requires a good balance between three requirements - (1) a solid platform with rich mathematical/statistical functionality (2) having an easy to use, contemporary, programming environment which permits easy and flexible front end code development and (3) an easy to use interface between the two environments. In this artcile I am going to explain how such a balance can be attained by using two of the best products in their specific worlds - using the rich R library as the mathematical/statistical component but then interfacing with C# for the front end application design. As an interfacing option I banked on using R (D)COM which provides an easy to use interfacing method which keeps you away from spending hours identifying interfacing problems. The software required for this tutorial is the following: 1. R software ( download from here ) 2. R (D)COM In...

Interfacing C# .Net and R - Integrating the best of both worlds (Part 2)

This post is a continuation from the previous post ( Part I ) focusing on interfacing C# with R using the R (D)COM. In this post I am going to enhance my previous exercise by creating a Facade .Net Class which facilitates access to specific functions in R. Creating the R Facade Class Creating a Facade Class (or a set of .Net classes) which acts as a .Net wrapper to R functions greatly facilitate the use of R functions and their integration within the .Net programming environment. Below I am showing an excerpt from the class RFacade that I have created in this example. using System; using System.Collections.Generic; using System.Linq; using System.Text; using StatConnectorCommonLib; using STATCONNECTORSRVLib; using System.Runtime.InteropServices; namespace R { class RFacade : IDisposable { private StatConnector rconn; private bool disposed = false; public RFacade() ...

Interfacing C# .Net and R - Integrating the best of both worlds (Part 3) - Trader Desk Example

In this third and final part of the series ( Part 1 , Part 2 ), I am going to continue shaping the examples in the previous posts by quickly building a small application - a simple Trading Desk application. In the example I will use the same C# and R interface method together with a specific Quantitative Financial Modelling R library called Quantmod . Example Objective In the example the objective is to build a C# Web Form which acts as the main application controller that captures various user option parameters with the main functions being: 1. To automatically kick off an R routine to download data from Yahoo Finance. 2. To select specific dates of interest 3. To add or udpate different charts 4. To add different chart indicators 5. To calculate Period Return Statistics Most of these functions are provided through the set of R functions exposed by the Quantmod R library. Additions under the hood Below I am showing some of the salient additions done to the code over and abov...

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