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Medium 9781601323255

Comparing Collective Behaviour of Sociophysical Models

Hamid R. Arabnia, Leonidas Deligiannidis, Jane You, George Jandieri, Ashu M. G. Solo, and Fernando G. Tinetti CSREA Press PDF

Int'l Conf. Modeling, Sim. and Vis. Methods | MSV'14 |

17

Comparing Collective Behaviour of Sociophysical Models

C. Butt1 , D. P. Playne1 and K. A. Hawick2

1 Computer Science, Massey University, Auckland, New Zealand

2 Computer Science, University of Hull, Hull, United Kingdom

Email: d.p.playne@massey.ac.nz, k.a.hawick@hull.ac.uk

Tel: +64 9 414 0800 Fax: +64 9 441 8181

Abstract— Many complex systems such as crowds, financial and economic markets and other sociological systems can be modelled as a collection of microscopically simple individual agents. These models have properties in common with some physical systems in that they exhibit critical behaviour or phase transitions where a small change in a controlling parameter can give rise to a sudden and dramatic change. Such systems are difficult to study using conventional analytic mathematical techniques and generally require numerical simulation to allow study of the complex emergent effects that occur. Three sociophysical models based on opinion formation and cultural dissemination are presented and discussed. The behaviour of these three models are analysed and compared to show the effect of the social forces present in each of the models.

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Medium 9781617833656

Tour Book

Murray, Julie ABDO PDF
Medium 9781449320171

Unsafe Code and Pointers

Joseph Albahari O'Reilly Media ePub

C# supports direct memory manipulation via pointers within blocks of code marked unsafe and compiled with the /unsafe compiler option. Pointer types are primarily useful for interoperability with C APIs, but may also be used for accessing memory outside the managed heap or for performance-critical hotspots.

For every value type or pointer type V, there is a corresponding pointer type V*. A pointer instance holds the address of a variable. Pointer types can be (unsafely) cast to any other pointer type. The main pointer operators are:

Operator

Meaning

&

The address-of operator returns a pointer to the address of a variable.

*

The dereference operator returns the variable at the address of a pointer.

->

The pointer-to-member operator is a syntactic shortcut, in which x->y is equivalent to (*x).y.

By marking a type, type member, or statement block with the unsafe keyword, youre permitted to use pointer types and perform C++-style pointer operations on memory within that scope. Here is an example of using pointers to quickly process a bitmap:

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Medium 9780596001773

17. Menus in Windows

ePub

This chapter discusses three built-in control classes that display menus in windows: PopupMenu, BevelButton, and ContextualMenu.

A PopupMenu is a RectControl, and therefore receives all the events and has all the methods and properties listed in Chapter 10: Open and Close events; Visible, Enabled, and AutoDeactivate properties; Top, Left, Height, and Width properties; LockLeft, LockRight, LockTop, and LockBottom properties; MouseEnter, MouseMove, and MouseExit events; and Refresh and RefreshRect methods.

A BevelButton is a RectControl too, and its also a button. For its button-related aspects, see Chapter 12.

A PopupMenu displays itself as a roughly rectangular region of the window, usually containing some text (its caption), and with an arrow at its right end. (To eliminate the display of the caption, narrow the control to about 20 pixels, which should cause it to consist of just the arrow.) When the mouse is depressed within an enabled PopupMenus boundaries, the PopupMenu takes on a depressed or highlighted appearance and displays a menu. When the mouse is subsequently released, the menu vanishes; if the mouse was released over a menu item, the text of that item becomes the caption, and the next time the menu is shown, that item will have a check mark or some similar indicator next to it. Figure 17-1 shows an example.

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Medium 9781847770929

Bunafahy: Lower Grassland

John F. Deane Carcanet Press Ltd. PDF

Bunafahy: Lower Grassland

She was always old, grandmother, and sea-sorrow had made her so; arms akimbo, she leaned back against sun-warmed rocks, tired in black, as the rocks are; easy waves came reaching onto the strand while children’s calls were lost in the cries of gulls; a patch of the high field glistened under sun, as the world offers, betimes, small glistenings of joy though there are shelves of tritest stuff no tide will cover; pulsings in the water of unwarranted jellyfish, as if the ocean pulsed itself to pain; sister death – idling almost visible in the rough waves offshore – was close to her as her two lost sons, her fingertips bruised from too much telling of the beads, it being sure

Jesus-Prospero had told an end to sorrow; now she watched white ocean-fingers writing words onto the sand.

Bunnacurry

There is, always, a riverbank, a flowing, stuff of dream-beginnings, where you fished with hacked-off stick and twine, filched hook and torn worm, lifting an eel that poured like a thread of molten butter onto grass, and you dreaded it, dreaded the squirm and coil, how it would slime around your fingers, so that you left it, stick and twine and catch, riverbank and muddle-pool, and ran, leaving a river that had become scarcely a stream when you returned, a stream so choked with fern, thistle and bramble-reach that you can barely see

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