I have a source and a variable. in the "on exit" source section there is "variable=source.count()". The source generates n agents by inject fuction, but the variable has value n-1. why?
thanks for the help.
so I assume you want to count the agents that have been generated on that source.
Using a variable is in the first place redundant since you can use source.count() everywhere in your model instead of the variable, and it will work.
Nevertheless if you insist in using a variable, you need to use the variable in the block AFTER the source since it seems that the count is made internally in anylogic after the "on exit" action.
so for instance if you have a delay block after the source, write variable=source.out.count(); in the "on enter" action of the delay block.
Related
I want to use SelectOutput5 block in order to differentiate same agents according to machines which they have been assigned. As you can see the images, one of the example of my SelectOutput5 block's condition is;
agent.st2Tezgah == "M117";
However even though st2Tezgah parameter has M117 value in it, it does not trigger and it goes false section.
I check the parameter with traceln(agent.st2Tezgah) as you can see the image, the value is true.
Why SelectOutput5 does not trigger properly?
Flowchart
Code
Traceln
st2Tezgah parameter
DB
Result
Two things:
Always compare strings using .equals("myString"), not ==.
Make sure you do not set the st2Tezgah variable "just before" the SelectOutput5. Try having a delay (with 0 duration) before it and see if it works. If so, you need to learn about the difference of "on exit" and "on at exit" (subtle but important here)
Anylogic: This should be simple but I just cannot find it in the help files..
On creating a new agent instance, we know there are four parameters and what they are, but not in what order they were defined. Lets say parameters are "type_of_car" (String), "number_of_pax" (Integer), "automatic" (boolean), "fuel_capacity" (double). Now when calling: new myagenttype("ford", 5, false, 55) the agent gets created as a ford with 55 pax, manual and 5 liter fuel capacity - which is all wrong. (it seems the definition order of the parameters in the agent definition are in a different order)
How do we include the parameter name (or definition) when we call new agenttype() to avoid this problem, ensuring the right value gets assigned to the right parameter?
The problem originates because of a bug in Anylogic's logic in triggering functions. We have a Split which creates a new agent and assigns the agent properties on the "On exit copy" - event, however what Anylogic does is it creates the agent, forward it to the next logical block (a decision node), then execute the code of the decision - all wrong now for the agent's properties are undefined - and only then executes the "On exit copy" event which assigns the agent's properties. Very frustrating.
This is actually not a bug, this is defined in the simulation experiment properties, in the randomness section, with the "selection mode for simultaneous events" property. The default is LIFO, but if you want the opposite behavior in your case you should use FIFO... I always use LIFO too, and in these cases, sometimes I might use a 1milisecond auxiliary delay between the split and the next block in order to control the order manually... if you do that, you will solver your problem in fact... just use a 0.001 miliseconds delay after your split
Now from your Agent Type problem, the arguments for your class constructor should be written in order, and the only way to know the correct order is by using the autocomplete feature when you write new agenttype()... the autocomplete will tell you the order in which you should write your constructor arguments.
the basic idea behind the modeling issue is a breakdown of a production machine.
I would like to model this by setting the arrival rate (simply arrivals per second) to zero (Source.rate = 0). After the machine is repaired, the arrival rate is set to its actual value again (e.g., Source.rate = 5). While the first command does the job, the second does not seem to have any effect, i.e. new agents are not created.
The segment of the model is rather simple: Source --> Select Output (decision about breakdown) --> true: go on in production; false: delay (repair machine) --> go on in production.
Source.rate = 0 is called at the out port (false) of "breakdown" and Source.rate = 5 at the out port of "repair".
https://i.stack.imgur.com/hqGoI.png
Of cause, this issue might be modeled differently (e.g., using hold with disabled "forced pushing"), however, it is not clear for me why my approach does not work.
Thanks in advance!
Instead of using source.rate=5; use source.set_rate(5);
To expand on Felipe's answer with an explanation:
Instead of using source.rate=5; use source.set_rate(5);
rate is effectively a Parameter (in the AnyLogic sense) of the Source block. (All AnyLogic's Process Modeling blocks are actually themselves Agents developed by AnyLogic, and thus with Parameters, Variables, etc.)
You can set an AnyLogic Parameter directly (via just assigning a value as you did), but they also all have a set_<parameter name> method (function) which should really always be used instead because this triggers any internal on-change logic for this Parameter. It is only this triggered logic (internal to the Source block) which causes the Source to 're-evaluate' the rate properly.
(You can use on-change logic for Parameters in your own models, and need to do so when altering a parameter requires some 'adjustments' to the rest of the model; i.e., in situations where the change doesn't 'just work' due to other bits of the model reading the new value after the change point.)
I don't know why your model doesn't work (maybe more details of your model is needed), but a simple solution which I tested and worked, is as below:
You can set the source's "Type of arrival" to "calls of inject() function", add an event to your model and set its "Trigger type" to "Rate" and set its rate value to 5. Then in action code of the event use below code:
if(yourCondition)
{
source.inject(1);
}
I hope it helps you.
I am new to anylogic and need to create an actionchart for my master thesis. I know how to set it up and all but I don't know how I can see if the algorithm worked. I tried to use statistics where I choose my used variables but this shows me always the initial value.
This is what I tried to do: Just a first easy algorithm. I have a variable "test" with initial value 0. I have created an action chart with a "for loop" (for i=0;i<10;i++). And in the loop I have placed a code-block with test=test+1;.
And I have placed outside of the loop a return-block where I return "test".
So this action chart should just add 1 for every loop to my variable test. At a result the value should be 10.
When I am running this there are no errors but also no results. The Statistic block only shows the value 0. And now I don't know what I am doing wrong. Is the error in the action chart or at the statistics?
I have searched in Google and read "anylogic in three days" and was searching at the anylogic help.pages... I havn't found a solution so I thought that maybe someone knows what I am doing wrong.
I rebuilt the example you describe, and I am getting an action chart that returns the value 10. I also added a statistics block and associated it with the value of test, and it shows a value of 10. Is it possible that you are just never calling the action chart (analogous to calling a function), therefore it never executes?
In general, I would avoid action charts, as I have found it is just easier to write and maintain code in the AnyLogic functions or Advanced Java area.
The Gain block and continuous block in Simulink require the user to specify a gain. This can be a workspace variable. But I want to vary this gain during runtime. I can't seem to get a solution for this. This idea is simple but I can't believe it is so difficult to implement.
I have tried using another block to write to workspace, but found out that the 'to workspace' block only writes to the workspace after the simulation ends or pauses.
I can store the variable in a data memory block, but I don't know how to specify the gain value(s) for the gain/PID block in this case.
If you have Inline Parameters turned off (it's on the Optimization page of the Configuration Set), you can just open the gain block dialog and change the value. If you want to use a workspace variable, then you can change the value of the workspace variable and do an Update Diagram (^D) while the simulation is running.
There's also a block called the Slider Gain which allows you to change the gain value using a slider UI.
May be it'd be helpful at some point: try using the MATLAB Function Block (Matlab user-defined function that can be used directly in Simulink).
As a command-line alternative, you can use the SET_PARAM function to change the Gain value of the block during model simulation.
For example, the following code would change the Gain value of a block named "My Gain" at the top level of a model called "my_model.mdl" to a value of 20:
set_param('my_model/My Gain','Gain','20');
Note, however, that only Tunable Parameters can be changed with SET_PARAM at runtime.