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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 NetLogoLab 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: patch-ahead
NetLogo Dictionary
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patch-ahead 2.0

patch-ahead distance

Turtle Command

Reports the single patch that is the given distance “ahead” of this turtle, that is, along the turtle’s current heading. Reports nobody if the patch does not exist because it is outside the world.

ask patch-ahead 1 [ set pcolor green ]
;; turns the patch 1 in front of this turtle
;; green; note that this might be the same patch
;; the turtle is standing on

See also patch-at, patch-left-and-ahead, patch-right-and-ahead, patch-at-heading-and-distance.

Take me to the full NetLogo Dictionary.

NetLogo 3D Dictionary: patch-3d

Documentation for the patch-3d primitive.

NetLogo Dictionary: patch-at

Documentation for the patch-at 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.

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Copyright © 1999-2026 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 [email protected] .

For more information, visit the NetLogo website .