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The NetLogo development team at the Center for Connected Learning and
Computer-Based Modeling at Northwestern University is pleased to
announce the release of NetLogo 3.1. NetLogo 3.1 is available for
free download from our site at http://ccl.northwestern.edu/netlogo/ .
Please try it and out and send us bug reports at
bugs@ccl.northwestern.edu and other suggestions and comments at
feedback@ccl.northwestern.edu.
Almost all models created in earlier versions of NetLogo will work
in NetLogo 3.1. If you have any trouble running models from a previous release, please consult:
http://ccl.northwestern.edu/netlogo/docs/faq.html#31transition
The following is a (partial) list of changes made and new features
added since NetLogo 3.0:
* system:
+ the 3D view now works on Intel-based Macs
+ for Windows users, our bundled Java version is now 1.5 (was
1.4)
+ for Mac users, Java 1.5 is now used if it is available
* models:
+ new earth science model: Grand Canyon
+ new EvoLab evolution model: Sunflower Biomorphs
+ new social science model: Ethnocentrism
+ new mathematics model: Voronoi
+ new physics model: DLA Simple
+ new computer science models: Perceptron, Artificial Neural
Network
+ new biology/system dynamics models: Tabonuco Yagrumo,
Tabonuco Yagrumo Hybrid
+ new code examples: Moore & Von Neumann Example, Intersecting
Lines Example, Diffuse Off Edges Example, Tie System Example
+ improved ProbLab model: Dice Stalagmite
+ improved social science models: Traffic Grid, Scatter
+ improved chemistry/physics model: GasLab Circular Particles
(runs faster)
+ improved networks models (using experimental link
primitives): Giant Component, Preferential Attachment, Small
Worlds
* features:
+ randomized agent ordering: every agentset is now always in
random order (a different random order each time you use it)
+ world topologies:
- the world isn't always a torus anymore; by turning
vertical and horizontal wrapping on or off, you can
choose between a torus, a rectangle, or a vertical or
horizontal cylinder
- using primitives ending in -nowrap is no longer
necessary; just turn off world wrapping instead
- new can-move? reporter lets turtles sense the world
edges
- screen-edge-x and screen-edge-y have been renamed to
max-pxcor and max-pycor (and new min-pxcor and min-pycor
primitives have been added)
- screen-size-x and screen-size-y have been renamed to
world-width and world-height
- see the Topology section of the Programming Guide for
more information
+ new, experimental suite of link primitives, useful for
network models and others; see Links sections of Programming
Guide and Primitives Dictionary
+ model authors can now specify the singular form of a breed
name:
- the new syntax for declaring each breed is e.g. breed
[wolves wolf]
- you can ask for a breeded turtle by who number, e.g.
wolf 0
- in model output, breeded turtles also appear as e.g.
wolf 0
- added new reporter e.g. is-wolf?
- this form also appears elsewhere in the user interface,
e.g. when picking a turtle from the view, in turtle
monitors, and so on
+ new command stamp-erase
+ new __tie and __untie primitives allow turtles to connect
their movement to another turtle. See the Tie Section of the
Programming Guide for details.
* other language changes:
+ the sort and sort-by primitives can now be used to convert an
agentset to a sorted list of agents; if you use sort, turtles
are sorted by who number, and patches are sorted
left-to-right, top-to-bottom
+ new reporters random-xcor, random-ycor, random-pxcor, and
random-pycor are handy for generating random coordinates
+ member? can now be used to check whether an agent is a member
of an agentset (worked in 3.0, but was undocumented)
+ random-one-of and random-n-of have been renamed to just
one-of and n-of
+ removed no-label from the language; use the empty string
instead
+ renamed user-choice to user-one-of, user-choose-file to
user-file, user-choose-new-file to user-new-file,
user-choose-directory to user-directory
* interface changes:
+ minor improvements to look & feel, e.g. vertical buttons in
toolbars instead of horizontal ones
+ the info tabs of saved applets are now more attractive, as in
the application
+ user-one-of (formerly user-choice) now always shows the
choices as a menu, never buttons
* engine fixes:
+ fixed 3.0-only bug where the repeat and let commands didn't
always work correctly when used from the Command Center
+ in the System Dynamics Modeler, system-dynamics-t is now
incremented at the end of each step, not the beginning
* interface fixes:
+ double clicking outside a bracket or parenthesis in the
editor now selects all of the text between the matching
brackets or parentheses
+ when shapes are off, shapes consisting of a single line now
still draw as lines, not squares
+ fixed some incorrectly worded compiler error messages
involving primitives that can take a variable number of
inputs, such as list and sentence
+ fixed Windows-only bug where the Procedures menu had trouble
showing very large number of procedure names
+ fixed Mac-only bug where pasting text from another
application could cause a compiler error
* BehaviorSpace changes:
+ you can now use the stop command in an experiment's go
commands, or in the procedure called by your experiment's go
commands, to stop a model run, the same way it works to stop
a forever button
+ you can now choose to save no results at all
+ the Abort button is now more often able to halt a stuck model
+ the Procedures tab is now always recompiled before an
experiment begins
* HubNet changes:
+ new activities: Bug Hunters Camouflage, Walking, Disease
Doctors, Function, Guppy Spots
+ improved activities: Predator Prey Game (formerly Herbivore
Carnivore), Root Beer Game (formerly Beer Game)
* API changes:
+ documentation now recommends using the server VM for best
performance
Reporting Bugs:
We would appreciate your comments and bug reports. If you find a bug,
please send us a bug report (as detailed as you can -- including OS,
method of running NetLogo, commands used, attach your model if
possible, etc.) so that we can correct the bug as speedily as
possible. Please send bug reports to bugs@ccl.northwestern.edu.
Feedback:
To provide feedback to the NetLogo development team, please send email
to feedback@ccl.northwestern.edu or visit our contact page at
http://ccl.northwestern.edu/netlogo/contact.shtml .
Getting Started:
To get started using NetLogo, visit our web page:
http://ccl.northwestern.edu/netlogo/ .
Receiving Release Announcements:
To receive announcements of NetLogo releases and new features,
subscribe to the netlogo-announce mailing list. To subscribe to
netlogo-announce, send a message to:
listserv@listserv.it.northwestern.edu
The body of the message should say:
subscribe netlogo-announce your-first-name your-last-name
To be removed from the announcements list, send a message to:
listserv@listserv.it.northwestern.edu
The body of the message should say:
unsubscribe netlogo-announce
Joining the netlogo-users group:
We also have a Yahoo! group where users can discuss NetLogo
with each other and with the CCL team. To join the group, or
just to browse the group's message archives, visit:
http://groups.yahoo.com/group/netlogo-users/
There is also a Yahoo! group specially designed for educators
using NetLogo. To join the group, or just to browse the group's
message archives, visit:
http://groups.yahoo.com/group/netlogo-educators/
NetLogo 3.1 files
The release package for NetLogo 3.1 includes:
* "NetLogo" application
* "HubNet Client" application
* "NetLogo.jar", "NetLogoLite.jar", "lib" internal support
files and folder
* "Docs" folder containing a "NetLogo User Manual" -- complete
documentation in HTML and printable PDF formats
* "Models" folder with several hundred NetLogo models and HubNet
activities
* "Extensions" folder containing support for music & sound
and physical devices
* "readme.txt" file
Credits
NetLogo was designed and authored by Uri Wilensky, project leader and
director of the CCL. The lead developer is Seth Tisue. Many others
have greatly contributed. HubNet was jointly designed by Uri Wilensky
and Walter Stroup.
The design of NetLogo was supported through funding from the National
Science Foundation (grants REC 9632612, REC 9814682, REC 0126227, CCR
0326542). Additional support for the design of HubNet (calculator
version) was provided by Texas Instruments.
Enjoy,
--
Uri Wilensky
Associate Professor of Learning Sciences and Computer Science
Director, Center for Connected Learning and Computer Based Modeling
Executive Committee, Northwestern Institute on Complex Systems
Northwestern University
http://ccl.northwestern.edu |
