I haven't had a good look at Bin's paper yet, but it seems to me that his
work has an advantage over the googol (i.e. 10 followed by 100 zeros)
number of projects that are starting on this list every week: it's
finished and will appear in print in a respected journal.
Power-law distributions often have exponential cut-offs at the tail, which
mean that the straight lines become curves. This is a well know phenomenon
in real networks and one that I would expect to be present in street
networks as physical constrains are bound to restrain growth at large
scales.
One of the problems I had in the Physica A paper was that we do not know
what a street is. There are several representations out there, but there
is no uniquely accepted concept?
Rui
________________________________________
Rui Carvalho
http://www.casa.ucl.ac.uk/rui/
Senior Research Fellow
Centre for Advanced Spatial Analysis
University College London
1-19 Torrington Place
Gower Street
London WC1E 6BT, U.K.
On Wed, 30 May 2007 16:16:25 +0100, Lucas Figueiredo
<[log in to unmask]> wrote:
>Really?
>
>So physicists really believe that curves are straight lines? Those
>plots are not power-laws.
>
>I mentioned in my paper that a large number of cities have non-scale
>free behaviour (maybe because my database includes a more rich
>variety).
>
>However, the best candidates for a "scale-free" street networks are
>american cites for the continental aspect and the car-oriented design.
>
>Anyway I see curves in your paper. Maybe I need to change glasses again!
>
>I will read and give my comments to you,
>
>Lucas
>
>On 30/05/07, Bin Jiang <[log in to unmask]> wrote:
>> Hi, Lucas and mike, Nice papers looks. my paper will appear in Physica
A.
>>
>> Bin
>>
>> Figueiredo wrote:
>> > Hi Bin,
>> >
>> > Have a look at:
>> > http://eprints.ucl.ac.uk/archive/00002694/
>> >
>> > Lucas Figueiredo
>> > Bartlett School of Graduate Studies
>> >
>> >
>> > On 30/05/07, Bin Jiang <[log in to unmask]> wrote:
>> >> this paper might be of interest to some of you,
>> >> http://arxiv.org/ftp/physics/papers/0703/0703223.pdf
>> >>
>> >> your comments are welcome.
>> >>
>> >> Cheers.
>> >>
>> >> Bin
>> >> --
>> >>
>> >> ------------------------------------------------
>> >> Bin Jiang
>> >> Department of Land Surveying and Geo-informatics
>> >> The Hong Kong Polytechnic University
>> >> Hung Hom, Kowloon, Hong Kong.
>> >> Tel: (852) 2766 4335, Fax: (852) 2330 2994
>> >> Email: [log in to unmask]
>> >> ------------------------------------------------
>> >>
>> >
>> >
>>
>>
>> --
>> ------------------------------------------------
>> Bin Jiang
>> Department of Land Surveying and Geo-informatics
>> The Hong Kong Polytechnic University
>> Hung Hom, Kowloon, Hong Kong.
>> Tel: (852) 2766 4335, Fax: (852) 2330 2994
>> Email: [log in to unmask]
>> ------------------------------------------------
>>
>
>
>--
>Lucas Figueiredo
>http://www.flickr.com/photos/lucasfigueiredo/
>
>Mindwalk
>http://www.mindwalk.com.br
|