AMPL: A Modeling Language for Mathematical Programming by Fourer R., Gay D.M., Kernighan B.W. PDF

By Fourer R., Gay D.M., Kernighan B.W.

ISBN-10: 0534388094

ISBN-13: 9780534388096

AMPL is a language for large-scale optimization and mathematical programming difficulties in construction, distribution, mixing, scheduling, and plenty of different purposes. Combining general algebraic notation and a strong interactive command setting, AMPL makes it effortless to create versions, use a wide selection of solvers, and look at ideas. even though versatile and handy for speedy prototyping and improvement of versions, AMPL additionally deals the rate and generality wanted for repeated large-scale construction runs. This publication, written via the creators of AMPL, is an entire consultant for modelers in any respect degrees of expertise. It starts off with an educational on generic linear programming versions, and provides all of AMPL's beneficial properties for linear programming with large examples. extra chapters disguise community, nonlinear, piecewise-linear, and integer programming; database and spreadsheet interactions; and command scripts. so much chapters contain workouts. obtain loose types of AMPL and a number of other solvers from www.ampl.com for experimentation, assessment, and schooling. the website additionally lists proprietors of the industrial model of AMPL and diverse solvers.

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What makes Ruby stand out is that the language provides more than one way to do something, even important things like calling methods. When you’re reading someone else’s Ruby code, it’s helpful to know that Ruby provides various ways to accomplish common tasks. Consider the most common operation you can do in Ruby: calling methods. There are a few ways you can do this. Objective-C and Ruby: what you need to know 19 Suppose you have a string, and you want to reverse the characters in it. You can use the String#reverse method to accomplish this.

9 Ordered and unordered hashes/sets In previous versions of Ruby, a hash is unordered. This means that you can’t count on your hash returning its objects in the order in which they were added. 9, a hash has an order attached to its behavior. For example, if you add items A, C and B to a hash in that order, they’ll remain in that order when you retrieve the keys from that hash. 9, but in MacRuby, hashes are unordered. MacRuby hashes are implemented on top of the Objective-C class NSMutableDictionary, which doesn’t support ordered sets.

HotCocoa provides a set of mappings that wrap the standard Objective-C Cocoa API in a more Ruby-friendly and easy-to-configure set of methods. HotCocoa is available as a Macgem and can be installed by running the following from your terminal: sudo macgem install hotcocoa You’ll learn HotCocoa in-depth in chapter 9. For now, let’s see what it would take to create the same window in the previous MacRuby example: win = window :frame => [300,500,400,200] Much easier, isn’t it? Now, let’s take a look at one more option for user interface development: Interface Builder.

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AMPL: A Modeling Language for Mathematical Programming by Fourer R., Gay D.M., Kernighan B.W.


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