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Washington DC Area Mathematica Special Interest Group

  • To: mathgroup at smc.vnet.net
  • Subject: [mg118219] Washington DC Area Mathematica Special Interest Group
  • From: "Bruce Colletti" <bwcolletti at verizon.net>
  • Date: Sun, 17 Apr 2011 07:51:31 -0400 (EDT)

Mathematica SIG
(http://web.me.com/hrbishop.pmsi)

MEETING

22 April 2011, 7:30 am

Science Applications International Corporation (SAIC)
8301 Greensboro Drive
McLean VA
Southern Corner of Westpark Drive and Greensboro Drive
Agenda


1.  Prepared Talks

"Solution of a Detection Problem", by Mel Friedman

ABSTRACT.  Hypothesis H1 is a probability density function that is a
function of X1 and X2.  Hypothesis H0 is a different probability density
function that is also a function of X1 and X2.  We are given a single
experimentally measured pair (X1,X2) and we assume P1, the probability of
H1, P0 the probability of H0 and CIJ are known.  Here CIJ is the cost of
picking hypothesis I when hypothesis J is true for I, J =0,1.  With the help
of detection theory and Mathematica, an algorithm is developed for choosing
a hypothesis in such a way as to minimize the risk (another name for the
expected cost of the decision).  Then using Mathematica and without
knowledge of P1, P2 or the costs, a receiver operating characteristic or ROC
 curve is constructed.  The ROC curve is a graph of probability of detection
versus probability of false alarm and these will be defined in the
presentation.  Finding the ROC curve required doing a double integral over a
region defined by a transcendental equation.  The talk will illustrate how
Mathematica facilitates the solution of this type of problem and also
illustrates how to do double integrals over a region defined by a
transcendental equation.  


"A Snapshot of Retail Gasoline Prices Since 1986", by Dan Martinez

ABSTRACT.  In this presentation, Dan will show a plot of the monthly price
range that he paid for gasoline from January 1986 to today. The plot
includes dynamic controls for lower and upper date range and an inflation
estimator. The plot also uses an application of ColorFunction with Filling.


"Making a Demonstration Project", by Harry Bishop

ABSTRACT.  Building a demonstration is more than just constructing a
Manipulate expression. Once the expression is developed and running, the
entire project needs to be in the form of a demonstration notebook. An
authors account and uploading the demonstration starts the Wolfram review
process. Further communication and revision may be required.  Reviews by
editors, technical performance and evaluation groups occur. If approved,
posting of the demo on the Wolfram Demonstration site is the last step.

 

2.  Mathematica Gems and Discoveries

- Sharing of Mathematica programming oddities
- Applications of Mathematica to some areas of science
- Something recently read and worth sharing

3.  Mathematica Questions, Possible Approaches and Discussion

4.  New Business.  Select next meeting presentation, time and place.


---------------------

Directions to 8301 Greensboro Drive, McLean VA (tall, boxy and white SAIC
Enterprise Building at south 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 6:50AM if you wish to join us for a dutch-treat
breakfast, and no later than 7:20AM to attend the meeting only. The desk
officer will ask for a driver's license before issuing a visitor's badge.




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