To get the desired program execution, a correct understanding on the use of logic operators ( AND, OR, XOR) as well as mathematical operators is essential so as to produce the correct results. Set pcolor ifelse-value (pxcor > 0) pcolor will either have blue or red depending on the reporter value (pxcor > 0) This can be used when a conditional is needed in the context of a reporter, where commands (such as ifelse) are not allowed. With the use of ifelse-value, a specific variable can have a different value based on the value of the reporter. If FALSE, the result is the value of reporter2. If reporter's value is TRUE, the result is the value of reporter1. If pxcor > 0 agents with pxcor greater than 0 will be colored blue and agents with pxcor less than 0 will have red Ifelse reporter įor ifelse, if reporter's value is TRUE, it runs commands1. If pxcor > 0 agents with pxcor greater than 0 will be colored blue. With if, we expect some agents to run commands while others don't, this is because the reporter may have different value for different agents. The reporter must report a boolean (true or false) value. These are oftentimes used to change the properties of agents such as color, position, heading and other user-defined variables. In NetLogo, k nowing when to use if, ifelse, ifelse-value is important. Instead of combining loop with an if expression and a stop command, you could just use while: while ] [įinally, I don't think you need it here, but for complicated control flow code, you can use the cf extension that adds "switch" like statements to NetLogo.When commands are to be executed conditionally, that is depending on the outcome of an evaluation, a selection control structure must be used. Instead of checking for != white and != brown in two separate expressions, you can combine them using member?: ] of patch-ahead 1 If all boolean s report false, the result is the value of elsereporter. When using only one boolean you do not need to surround the entire ifelse-value primitive and its blocks in parentheses. In your case, that could be achieved by combining your conditions in a single expression using and: ifelse is-patch? patch-ahead 1 For the first boolean that reports true, runs the reporter that follows and reports that result. Is there a better way to check patches and turn turtles? This very nested setup might be a poor choice?Īs you have correctly seen, deeply nested code is undesirable and can usually be avoided. Maybe that was the source of your problem? What I do get is the "Expected a constant" compilation error because patch-ahead 1 is-Patch? is inverted. Very often, just trying to create such an example will help you solve your problem.) (In general you should try to post simplified but "complete" examples of your code that someone can paste into NetLogo and play with. We guarantee youll be delighted to find how much fun it is to play with our extremely easy-to-use free logo generator. I don't get that error from the code snippet you posted. Each patch is a square piece of ground over which turtles can move. Patches: The NetLogo world is two-dimensional and is divided up into a grid of patches. The NetLogo world is made up by four types of agents (see figure 2 ), i.e.: Turtles. ProQuestion: Is there a better way to check patches and turn turtles? This very nested setup might be a poor choice? The NetLogo world is made up of turtles, patches, links and the observer. If condition evalutes to FALSE, then IFELSE runs false.instructionlist. I get an "Expected keyword" error when i try to run the code. IFELSE If condition evaluates to TRUE, then IFELSE runs true.instructionlist. Write the NetLogo code that will: set the turtle color to red if the turtle. The turned turtles will try to move during the next run of the loop or turn again. If any condition is false it will call a procedure called "turnTurtle". Netlogo Tutorial - IF and IFELSE Syntax - Answers Show more Show more IF and IFELSE syntax Peter Brooks 4.6K views 10 years ago Lists Peter Brooks 2.7K views 10 years ago 43 Netlogo Videos. Thats what I keep track of using the "steps" variable. The loop should run until every Mover has moved once. Ifelse not any? turtles-on patch-ahead 1 [ I Tryed to archive this with the following nested ifelse: loop [ NetLogo-ifelse Netlogo - ifelse statement 15:32:51 2 493 if-statement / patch / netlogo. I try to make some turtles move and avoid certain patches in NetLogo. Now i hit rock bottom with my knowledge and decided to ask my first question ever.
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