Get Network Performance Analysis: Using the J Programming PDF

By Alan Holt

ISBN-10: 1846288223

ISBN-13: 9781846288227

ISBN-10: 1846288231

ISBN-13: 9781846288234

The goal of community functionality research is to enquire how traffic-management mechanisms deployed within the community impact the allocation of assets among its clients and the functionality they event. This subject may be studied by means of the development of versions of site visitors administration mechanisms and looking at how they practice by means of making use of them to a few movement of community traffic.

This worthwhile quantity introduces recommendations and ideas of community functionality research by means of instance, utilizing the J programming language. J is wealthy in mathematical performance, which makes it a terrific instrument for analytical tools. The publication favours a realistic technique and develops features in J to illustrate mathematical innovations, thereby allowing readers to discover the underlying rules at the back of community functionality research. furthermore, this enables the topic to turn into extra available to those that, even though have a mathematical heritage, aren't natural mathematicians.

Topics and features:

• makes use of an example-driven method of introduce the basics of community functionality analysis

• offers a concise advent to the J programming language

• offers community calculus as a style for designing and engineering networks

• makes a speciality of statistical research and stochastic processes

• Demonstrates the best way to simulate site visitors with either short-range and long-range dependence properties

• Covers ATM QoS, and examines web congestion control

Network functionality Analysis will both entice community execs and postgraduates learning the subject via offering worthwhile analytical instruments and utilizing J as a method of providing a pragmatic therapy of the topic. Dr. Holt has a large variety of adventure and now usually lectures in this topic.

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Additional resources for Network Performance Analysis: Using the J Programming Language

Example text

Com. 1 Data Objects Here, we give a brief introduction to data objects in J. Data objects come in a number of forms: scalars, vectors, matrices and higher-dimensional arrays. 5983 22r7 2j3 _ __ 5x2 NB. NB. NB. NB. NB. NB. NB. NB. integer negative integer real rational complex number infinity negative infinity exponential notation 5 * exp(2) Note that negative numbers are denoted by an underscore (_) preceding the value rather than by a hyphen (-). An underscore on its own denotes infinity ∞, and two underscores denotes negative infinity −∞.

However, in its monadic form, % performs a reciprocal operation: % 2 NB. used monadically is reciprocal 3 % 2 NB. 5 Let us look at a few more examples. The monadic expression ˆx is the exponential function of x: ex . The dyad yˆx, however, performs y to the power x, that is: y x . To illustrate: ˆ 0 1 2 3 NB. 0855 2 ˆ 0 1 2 3 NB. 4 Positional Parameters The meaning of a positional parameter is given by virtue of its relative position in a sequence of parameters. J does not really have a concept of positional parameters; however, we can pass positional parameters to functions as an ordered list of arguments.

In the next subsection we introduce locales as a means of avoiding clashes in the name space. 1 Locales Functions can be organised into modules or locales. Verb names need only be unique within the locale, which helps to avoid name space clashes. In the example below, we define two verbs with the same name: f1 . An extra identifier is appended to verbs to denote the locale. f1_myloc_ =: +*: f1_newloc_ =: *-: NB. define f1 in ’myloc’ NB. define f1 in ’newloc’ The verb f1_myloc_ is defined in locale myloc, while f1_newloc_ is defined in newloc.

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Network Performance Analysis: Using the J Programming Language by Alan Holt

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