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Energy Resource Dynamics with the New System Dynamics Library for SystemModeler

Explore the contents of this article with a free Wolfram SystemModeler trial. Wolfram SystemModeler ships with model libraries for a large selection of domains such as electronics, mechanics, and biochemistry. Now I am pleased to present a new library in the family, the SystemDynamics library by François E. Cellier and Stefan Fabricius. System dynamics, a methodology developed by Jay Forrester in the '60s and '70s, is well suited for understanding the dynamics of large-scale systems with diverse components. It has been famously applied by the Club of Rome to investigate the limits of human growth; other applications include production management, life sciences, and economics (some showcases of the methodology can be found here).
Mikael Forsgren, Senior Applications Engineer, SystemModeler
Announcements & Events

There Was a Time before Mathematica…

In a few weeks it’ll be 25 years ago: June 23, 1988—the day Mathematica was launched. Late the night before we were still duplicating floppy disks and stuffing product boxes. But at noon on June 23 there I was at a conference center in Santa Clara starting up Mathematica in public for the first time:

Stephen Wolfram
Education & Academic

Centennial of Markov Chains

On January 23, 1913 of the Julian calendar, Andrey A. Markov presented for the Royal Academy of Sciences in St. Petersburg his analysis of Pushkin's Eugene Onegin. He found that the sequence of consonants and vowels in the text could be well described as a random sequence, where the likely category of a letter depended only on the category of the previous or previous two letters. At the time, the Russian Empire was using the Julian calendar. The 100th anniversary of the celebrated presentation is actually February 5, 2013, in the now used Gregorian calendar. To perform his analysis, Markov invented what are now known as "Markov chains," which can be represented as probabilistic state diagrams where the transitions between states are labeled with the probabilities of their occurrences.
Oleksandr Pavlyk, Senior Kernel Developer, Algorithms R&D
Announcements & Events

Winners of Wolfram’s First Demonstrations School Coding Competition Announced

Wolfram Research today announced the winner of its first Demonstrations competition as Michael Lawson from Ermysted's Grammar School, North Yorkshire, with runners-up Patrick Stevens, Woodbridge School, Suffolk and David Harris, St. Dunstan's College, London. Michael's Demonstration, "Recursive Dungeon Generator," was a particularly good showcase for applications of programming---in this instance, for game design. "I was working on creating my own Rogue-like game, and I was experimenting with different ways to generate rooms. This was one of my own algorithm ideas," said Michael, who, although he has been programming for four years, only started using Mathematica recently. "I actually only learned how to use Mathematica for the purpose of the competition. I started creating my demo after having only watched a few of the videos recommended for entrants, and then finished about four days later!" All three of the winning entries are published on the Wolfram Demonstrations Project site alongside 8,000 other user-created programs. "Recursive Dungeon Generation” "Semitones In Pythagorean Tuning and 12 Tone Equal Temperament” "Sorting Algorithms” The idea of the competition was to promote the application of programming in schools and support the UK government initiative to bring programming into schools.
Wolfram Blog Team
Announcements & Events

Announcing Wolfram SystemModeler

Explore the contents of this article with a free Wolfram SystemModeler trial. Today I’m excited to be able to announce that our company is moving into yet another new area: large-scale system modeling. Last year, I wrote about our plans to initiate a new generation of large-scale system modeling. Now we are taking a major […]

Stephen Wolfram
Announcements & Events

The Background and Vision of Mathematica

Opening keynote of the Wolfram Mathematica Virtual Conference 2011, September 26–27. Hi. I’m pleased to be with you. I’ve been asked to talk a bit about the background and vision of Mathematica. You know, this month it’s exactly 25 years since I started building Mathematica. It’s been really exciting seeing Mathematica grow and prosper over […]

Stephen Wolfram
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Mathematica Q&A Series: Generating Random Numbers

Got questions about Mathematica? The Wolfram Blog has answers! We'll regularly answer selected questions from users around the web. You can submit your question directly to the Q&A Team. This week's question comes from Peter, a secondary school teacher: How can I generate random integers between -10 and 10, but excluding 0? Read below or watch this screencast for the answer (we recommend viewing it in full-screen mode):
Andrew Moylan, Technical Content Specialist, Technical Communication and Strategy Group
Best of Blog

Building a Microscopy Application in Mathematica

As a change from my usual recreational content, today I thought I would describe a real Mathematica application that I wrote. The project came from my most important Mathematica user—not because she spends a lot of money with Wolfram Research, but because I am married to her! Her company, Particle Therapeutics, works on needle-free injection devices that fire powdered drug particles into the skin on a supersonic gas shock wave. She was trying to analyze the penetration characteristics on a test medium by photographing thin slices of a target under a microscope and measuring the locations of the particles. The problem was that her expensive image processing software was doing a poor job of identifying overlapping particles and gave her no manual override for its mistakes. Faced with the alternative of holding rulers up to her screen and recording each value by hand, I promised that I could do better in Mathematica, with the added advantage that now her image processing tool would be integrated into her analysis code to go from image file to report document in a single workflow.
Jon McLoone, Director, Technical Communication & Strategy
Education & Academic

Exploring America’s Debt Problem

It has been a roller coaster ride for the stock market lately. On August 1, the United States government avoided a default by a last minute deal to raise the debt limit. A few days later, we witnessed the first ever downgrade of U.S. credit by Standard & Poor's. Using Mathematica's TradingChart command, we can witness the stock market's immediate negative reaction to the downgrade. Note: Mouse over the chart to see the daily open, high, low, and closing price of the S&P 500 index.
Samuel Chen, Product Manager, Technical Communication & Strategy Michael Kelly, Senior Wolfram Technology Consultant, Wolfram Technology Group
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