Note that NetLogoWeb does not have feature-parity with NetLogo Desktop mainly due to limitations imposed by web technologies. This means that some extensions may not run on NetLogoWeb, some interface elements may not be editable e. However, a significant majority of NetLogo features should run seamlessly in NetLogoWeb and most of your models should run on NetLogoWeb without need for any modification. This library includes numerous models developed by the NetLogo team, scientific experts, and educators all around the world.
Each model in this library is carefully inspected by the NetLogo team. You can find models on a variety of topics under categories such as Biology, Computer Science, and Social Science. On NetLogo Desktop , you can access the models library by clicking the File menu and clicking the Models Library item in this menu. It is easy to run the library models in NetLogo. Almost all of them have a setup button and a go button. To run a model, first click the setup button and then click the go button.
Getting started with NetLogo NetLogo is an open-source multi-platform agent-based modeling environment that is available on all major desktop operating systems MacOS, Linux, Windows. If this is a problem for you, contact us at feedback ccl. I downloaded and installed NetLogo but the Models Library has few or no models in it. How can I fix this? So far, users reporting this problem all used the "without VM" download option for Windows. Uninstall NetLogo and try the "with VM" download instead.
Even if the "with VM" download fixes it for you, please contact us at bugs ccl. We'd like to fix this in a future version, but to troubleshoot it we need help from users. Can I have multiple versions of NetLogo installed at the same time? When you install NetLogo, the folder that is created contains has the version number in its name, so multiple versions can coexist.
On a Window system, whichever version you installed last will be the version that opens when you double click a model file in Windows Explorer. On a Mac, you can control what version opens via "Get Info" in the Finder.
Some of the files in the tarball have very long pathnames, too long for the standard tar format. On some systems, the GNU version of tar is available under the name "gnutar". You can find out if you are already using the GNU version by typing tar --version and seeing if the output says "tar GNU tar ".
Applets I tried to run one of the applets on your site, but it didn't work. What should I do? Current versions of NetLogo require that your web browser support Java 1. If you're on OS X OS X You must also use a web browser that supports Java 1. Internet Explorer does not work; Safari does. If you're on Linux or another Unix, you will need version 1. Check your browser's home page for information about installing the Java plugin. If you think you have the right browser and plugin, but it still doesn't work, check your browser's preferences to make sure that Java is enabled.
Can I make my model available as an applet while keeping the code secret? In order for the applet to operate, the model file must be accessible also. When you use "Save as applet" on the File menu, the HTML page generated contains a link where the user can download the model file. If you want, you can remove that link. Doing so will make it harder for the user to access the model file, but not impossible.
Can a model saved as an applet use import-world and file-open? Yes, but only to read files that are stored in the same directory on your web server as the HTML and model files. Applets cannot read files on the user's computer, only the web server. Usage How do I change how many patches there are?
A quick method is to use the three sets of black arrows in the upper left corner of the graphics window. Another method is as follows. Select the Graphics Window by dragging a rectangle around it with the mouse.
Click the "Edit" button in the Toolbar. You can also right-click [Windows] or control-click [Mac] on the Graphics Window to edit it, or select it then double-click. Can I use the mouse to "paint" in the graphics window? NetLogo does not have a built-in set of painting tools for painting in the graphics window.
But with only a few lines of code, you can add painting capability to your model. The same techniques can be used to let the user interact with your model using the mouse in other ways, too.
A third possibility is to create an image in another program and import it. See the answer to Can I import a graphic into NetLogo? How big can my model be? How many turtles, patches, procedures, buttons, and so on can my model contain?
We haven't tested models that use gigabytes of RAM, though. The NetLogo engine has no fixed limits on size. On Macintosh and Windows operating systems, though, by default NetLogo ships with a megabyte ceiling on how much total RAM it can use. On other operating systems the ceiling is determined by your Java VM. Here's how to raise the limit if you need to: Windows: Edit this section of the "NetLogo.
MAX allow the heap to get huge lax. You can reach this file by control-clicking the application in the Finder and choosing "Show Package Contents" from the popup menu. Other: Java VMs from Sun let you set the ceiling on the command line as follows. NetLogo Web is in continuous development. Click the "File: New" button in the top-right of any NetLogo Web model in order to open a fresh model.
To open a model from the Models Library, simply select it in the "Search the Models Library" dropdown. In that dropdown, models that work in NetLogo Web are selectable, while models that don't work yet are grayed out. The other option for opening models in NetLogo Web is to click the file-selection button labelled "Upload a Model", and then select a model on your computer. Note that opening a model in this way does not save your model remotely anywhere.
In fact, the "Upload a Model" file picker simply asks your web browser to open a file from your computer in such a way that the model never even leaves your computer when it is "uploaded".
If you would like to save the model that is currently open in NetLogo Web including any changes that you might have made to it , NetLogo Web offers two different ways of doing so. Like any other HTML file, files generated in this way can then be hosted on a website and viewed in any modern browser.
If you are interested in saving the model for use in the desktop version of NetLogo, the "Export: NetLogo" button can be used to do so. This will generate a traditional ". With a model downloaded from NetLogo Web, you can use the desktop version of NetLogo, make whatever changes to the model that you would like, save those changes, and then open the new version of the model in NetLogo Web using "Upload a Model" in NetLogo Web, like before.
Unfortunately, free and simple-to-use hosting services are surprisingly few in number these days. We realize that this makes things difficult for many of our users, and we definitely plan to provide our own service that makes this easier for people in the future. For the time being, though, there are still a couple of options that we can suggest, based on what kind of files you would like hosted. If you're just looking to host. Once your. Another option for linking directly to pages containing NetLogo Web models is to use the Modeling Commons , which is a public space for uploading, sharing, and discussing NetLogo models.
One option is to use GitHub Pages , or some other static web host. Advanced users might even be comfortable with simply hosting the HTML files for themselves on a public-facing web server. That said, hosting a. To do that, host the file, and make sure that your web server allows it to be accessed cross-origin. To do this, you might need to have the server set the Access-Control-Allow-Origin header in the. Every time someone goes to that link or an iframe is loaded that uses that link as the source URL , the most recent version of your model will be fetched from modelURL and turned into a simple model page.
While this generally should not be a problem, this method requires having an active connection to our website netlogoweb. NetLogo does not store the speed slider setting with the model file, but NetLogo Web provides a way to set the slider value on load using a URL query parameter. If you are linking your model all you need to do is add? You can set the speed value to any number between -1 slowest and 1 fastest , and 0 is the default. Here are some examples, setting the speed to 0. If you enter code into the Command Center and that code is invalid in NetLogo Web, you will receive an error message, and your code may not get fully executed.
If you get an error when the model is first loaded up, but can't tell what's going wrong, it's probably because one of the widgets e. The widget will not work correctly, but the parts of the model that did not generate errors will continue to be operable. If you get an error only when you click a button, it usually suggests that the particular button contains code that is currently invalid in NetLogo Web.
That button will be unusable, but the parts of the model that did not generate errors will continue to be operable. A type error in general indicates that a function received one or more arguments that it didn't know how to operate on. When we talk about a type error occurring in the simulation engine, we mean that this kind of error happened in the JavaScript code that is running in the browser. The fact that these errors occurred in JavaScript, though, does not necessarily indicate that the simulation engine is the culprit.
In fact, the vast majority of these sorts of errors are caused by ill-formed NetLogo code for which the engine does not yet know how to report nice errors. In desktop NetLogo, you always get informative type errors, but, unfortunately, NetLogo Web's error-reporting functionality is not yet complete enough to always give smart errors.
The area where NetLogo Web's error-reporting is poorest at the moment is in cases like ask n [] where n is a number, or really anything but an agent or agentset. If ask were passed a literal value instead of a variable like n , the compiler would usually just refuse to compile code that doesn't typecheck, and it would tell you exactly what went wrong.
Unfortunately, in NetLogo, static typechecking goes out the window when variables are introduced, forcing the engine to fall back on runtime typechecking.
Even more unfortunately, NetLogo Web's runtime typechecking is very poor at the moment.
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