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Home
Learn NetLogo
What is NetLogo? Tutorial #0 Sample Model Tutorial #1 Models Tutorial #2 Commands Tutorial #3 Procedures
Documentation
NetLogo Dictionary Interface Guide Interface Tab Guide Info Tab Guide Code Tab Guide Programming Guide Transition Guide Preferences Guide Version History
Advanced Tools
Extension Manager Shapes Editor BehaviorSpace System Dynamics HubNet HubNet Authoring Logging Controlling Mathematica Link NetLogo 3D Cluster Computing (HPC)
Extensions
Extensions Guide Arduino Array Bitmap CSV GIS GoGo LevelSpace Matrix Networks Palette Profiler Python Resource Rnd Sound Simple R Table Time Vid View2.5D
FAQ
primitive: create-turtles, crt
NetLogo Dictionary
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create-turtles 1.0 crt 1.0

create-turtles number

create-turtles number commands

create-<breeds> number

create-<breeds> number commands

Creates number new turtles at the origin. New turtles have random integer headings and the color is randomly selected from the 14 primary colors.

If the create-<breeds> form is used, the new turtles are created as members of the given breed.

If commands are supplied, the new turtles immediately run them. This is useful for giving the new turtles a different color, heading, or whatever. (The new turtles are created all at once then run one at a time, in random order.)

If number is fractional, it will be rounded down to the nearest integer (4.5 becomes 4, 10.9 becomes 10).

crt 100 [ fd 10 ]     ;; makes a randomly spaced circle
breed [canaries canary]
breed
[snakes snake]
to
setup
clear-all
create-canaries 50 [ set color yellow ]
create-snakes 50 [ set color green ]
end

See also hatch, sprout.

Take me to the full NetLogo Dictionary.

NetLogo Dictionary: create-temporary-plot-pen

Documentation for the create-temporary-plot-pen primitive.

NetLogo Dictionary: date-and-time

Documentation for the date-and-time primitive.


NetLogo is a programmable modeling environment for simulating natural and social phenomena. It was authored by Uri Wilensky in 1999 and has been in continuous development ever since at the Center for Connected Learning and Computer-Based Modeling.

Related Links
  • NetLogo Home
  • CCL Home
  • NetLogo Web
  • NetTango Web
  • NetLogo 3D
  • BehaviorSearch
  • Contact Us

Copyright © 1999-2025 Uri Wilensky and the Center for Connected Learning and Computer-Based Modeling at Northwestern University . All rights reserved.

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License , or (at your option) any later version.

Commercial licenses are also available. To inquire about commercial licenses, please contact Uri Wilensky at netlogo-commercial-admin@ccl.northwestern.edu .

For more information, visit the NetLogo website .