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Mathematica SIG (Northern Virginia and Washington DC)
The Washington D.C. area Mathematica Special Interest Group will meet Friday, 4 May, at the SAIC Enterprise Center building in Tysons Corner (see directions below). Early risers meet before 7:00 in the morning for admission at the front desk, then we have a Dutch treat breakfast downstairs. By about 7:30 we have moved to one of the projector rooms. Meetings consist of a prepared talk, informal discussion about Mathematica programming and applications, general questions, and new business. We'll end around 9:00. Harry Bishop will present "Adaptive Rejection Sampling": Abstract. Using the basic technique of sampling from an envelope distribution covering a more general type distribution, a random sample can be drawn from the general distribution. The problem becomes one of finding a suitable envelope distribution. This procedure demonstrates construction of piecewise exponential distributions to form an envelope over a log concave distribution with envelope and inverse envelope pure functions. If a sample point is rejected during the sampling process then it is added to the interval list resulting in a new envelope distribution. Ref: Gilks, W.R, Richardson, S., Spiegelhalter, D.J., Markov Chain Monte Carlo In Practice, Chapman & Hall, 1996, p. 82-86. Previous talks include World Line Construction and Analysis; Von Neumann Arithmetic Demonstration; Gibbs Sampling with Mathematica; Personal Knowledge Databases; Efficient Evaluation of a Double Integral With a Rapidly Oscillating Integrand; Calculating with Divergent Series; Animation of Simulation Results; and Probability Distributions via Polynomial-like Expansion. Our forthcoming website will post agendas, minutes, talks, and code fragments. To inquire about attending, e-mail Dan Martinez (dmartinez at sprintmail.com) or Bruce Colletti (bcolletti at compuserve.com). In your e-mail subject line, please include 'Mathematica SIG.' DIRECTIONS to 8301 Greensboro Drive, McLean VA (tall, boxy and white SAIC Enterprise Building at the corner of Westpark Drive and Greensboro Drive): From the Beltway, go northwest on Route 7 (Leesburg Pike) and proceed past Route 123 (Chain Bridge Road). Turn right onto Westpark Drive (Gosnell Road in the other direction). Turn right at the next light onto Greensboro Drive and then right into the parking lot. Visitor's Parking is adjacent to Westpark Drive. A SIG representative will meet you in the lobby. Please arrive no later than ten minutes to seven if you wish to join us for breakfast, and no later than twenty after seven to attend the meeting only. The desk officer will ask for a driver's license before issuing a visitor's badge.