MacResearch

About the Author

Kevin Theisen is the President of iChemLabs, which funds, develops and hosts the open source ChemDoodle Web Components.

WebGL, the HTML5 technology for native 3D graphics in browsers (without Java or other plugins), has arrived. This 3D ability allows scientists to create more interactive scientific and educational tools, cheaply and easily distributed through the web.

This tutorial discusses how to compile, run, and debug openmpi-enabled C++ programs in XCode. This is a work in progress and although I have some things working, I'd be happy to have suggestions for how to improve the process. I will assume that you have a working knowledge of what mpi is (the message passage interface for parallel programming) and just work through a simple project.

Author: Drew McCormack

At NSConference 2010 I delivered a presentation on developing the iPhone game Sumo Master using the Core Animation framework. It covered the usual bag of tips and tricks, but also the process of development, from twinkle-in-the-eye to App-Store reality.

I personally find articles and talks about the evolution of a concept particularly interesting, so I thought I would write up a similar experience I had building an advanced custom control for the study app Mental Case. The control was used in the iPad version of the app, but could just as easily be found on the Mac. (The iPhone screen would be too small.)

KNIME, the Konstanz Information Miner, is a visual platform for graphically building and editing workflows and data analysis pipelines from defined components called nodes. KNIME is developed in Prof. Michael Berthold's group at the University of Konstanz, Germany. It can be downloaded for free from www.knime.org.

英語チュートリアルの作成日：２００６年１０月１７日
著者：Drew McCormack
翻訳：Ignacio Enriquez
Japanese Version of Drew's Tutorial.

By Drew McCormack

There has been quite a bit of discussion the last few days about the momentum-based scrolling that Apple uses on the iPhone. The discussion has largely been fanned by John Gruber’s Daring Fireball blog. He has been arguing for some time that one of the reasons web apps feel inferior on the iPhone to native Cocoa apps is that the WebKit-based scrolling doesn’t behave the same. A recent post pointed to a JavaScript framework that Apple is apparently using internally, and which does produce a comparable scrolling experience.

This got me wondering how difficult it would be to reproduce Apple’s momentum scrolling on your own in JavaScript. Is the reason no web developers mimic native scrolling that it is too difficult, or is it just laziness or the expectation that it is very difficult that stops them? Or is JavaScript just not up to the task? To find out, I decided to try. About 3 hours and 100 lines of JavaScript later, I have my answer. Now it’s your turn.

The following tutorial was produced for MacResearch by VVI.

This tutorial shows how to make an iPhone application that graphs your data. It also provides the fundamentals for incorporating many 2D and 3D graph types in your iPhone applications.

By Drew McCormack

Snow Leopard brought with it blocks (closures) for the C and Objective-C languages. Blocks at first seem to be nothing more than anonymous, inline functions, but that is only partially true, because they are also a lot like objects, carrying about their context data with them. Once you start playing with blocks, a whole new style of programming opens up to you, and you find uses for blocks in places where you may not have expected them.

This is my list of ten different applications of blocks in C/Objective-C.

In this episode we'll go over an example of real-world code that has been parallelized by porting to the GPU. The use of shared memory to improve performance is covered as well as a discussion of synchronization points for coordinated work within a work-group. Source code is provided.

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Episode 6 - Shared Memory Kernel Optimization (Desktop/iPhone/iPod touch)
Episode 6 - Shared Memory Kernel Optimization (PDF)
Source code for Episode 6