![]() In other words, a prey agent does not die the very first time they run into a predator. Prey can be caught by predators a few at a time before they ultimately die out. Each predator agent can be thought of as a pack of wolves and each prey can be thought of a herd of sheep. Prey also lose energy when predators catch them. All animals gain energy by finding food and expend energy in the search for food. Prey eat plants (green areas), while predators eat prey. Predators and prey move around the world, searching for food. The model allows students to examine simple population dynamics like those modeled through the Lotka-Volterra equations in a participatory way. The wolves gain energy from consuming sheep, and the sheep gain energy from consuming grass (a primary producer). The population consists of wolf packs (predators) and sheep herds (prey), some controlled by students via HubNet clients and some androids controlled by the computer. This model simulates a predator-prey relationship. This would involve changing a lot of documentation and common practice in the NetLogo world, but may be the least painful option.Do you have questions or comments about this model? Yet another option would be transitioning the installer from a ".dmg" to a ".pkg" and installing the shared files to shared paths like /Library or ~/Library.This would also mean that users would have to jump through additional hoops when installing extensions used in multiple applications. We already receive frequent reports of download sluggishness or timeouts, especially from our international users. ![]() Having the shared components live inside each ".app" would solve the problem, but at the expense of a much larger download (probably 600+ MB).Note that the JRE is signed by Oracle and can't really be re-signed by us. Having the JRE shared means that there are ".dylib" files used by the JRE which live outside of the ".app"s themselves. We already do everything we can in terms of signing the dmg.Using absolute paths forces assumptions about whether/where the applications are installed while using relative paths allows for things like running NetLogo from a mounted ".dmg", installing NetLogo in a location other than "Applications", etc. Each NetLogo application determines where to look for these shared resources by assessing its relative directory at the time they open.The bundled JDK itself (NetLogo 5.3 and later).The NetLogo applications share several components which are stored in the "NetLogo" directory in which the applications live.This is a major problem that we will need to address. I can launch NL by executing the UNIX binary netlogo in the terminal, but this is not really a very elegant/convenient way of proceeding. I would not like to deactivate Gatekeeper because of this problem. How could we solve this problem? Is there a way to copy the NetLogo6.app in the root of the /Applications folder, but let it find the rest of the files in the NetLogo6.0 folder? SecTranslocateCreateSecureDirectoryForURL: created. I indeed see in the Console that OSX creates a sandbox when I double-click on the NetLogo 6.app: The resulting Read-only sandbox prevents a files from ever being written. The anti-malware feature launches a new application in a read-only sandbox, if the app is launched from its original folder/location or if it was not moved directly to the root of the Applications folder(no sub folder). In MacOS Sierra 10.12, Apple introduces a feature(headache) called 'Gatekeeper Path Randomization'. ![]() Since I have not received any reaction from the list, I have tried to find the cause of this problem, and one culprit I have been able to locate seems to be linked to the fact that NetLogo.App is in the NetLogo folder and Gatekeeper does not like it: I have already signaled the fact that when I double-click on NetLogo6.app, the icon appears and disappears on the screen, without launching the program. One user wrote in a very well-researched email: We've had several users express problems opening in Sierra.
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