SimileForum

Hi everybody,

I am trying to run models in Simile 4.4p1 under MS Vista. I must specify that my computer is in Japanese language.

The installation went fine, creating the model too, but when I try to run it, I get the following error:

An exception occurred while building this model. It generated this message: existence_error(open(C:/Users/kashim/My Documents/My Simile files/sim/Desktop1/model.cpp,write,_224898),1,file,c:/users/kashim/my documents/my simile files/sim/desktop1/model.cpp,).

Hi there,

Nigel Goddard wrote:

I've been looking a bit at the order of evaluation of equations in various System Dynamics software.  As far as I can tell the three systems I'm looking at (Simile, Vensim, Eccosim) are all different:

Vensim: Variables, then Flows, then Levels
Eccosim: Flows then Levels then Variables
Simile: Levels before Flows, with Variables I think mixed in depending on their dependencies

Hi there,

I have a compartment "comp1" with an initial value of 10,
i have a flow going out of the compartment with the eq.

if time(1)-init_time(1) >1 and time(1)-init_time(1)

the flow is connected to another compartment "cd1"

i am expecting that at age 1 the value of 5 will appear in cd1.
it doesnt. its a number more like 3.67...

im not sure why.

also my time step is 0.1

can you help me..

cheers
LS

When searching from the source of unexpected randomness in a purely deterministic model, I discovered a very strange behavior, which can be reproduced in a very simple population model:
Consider a population submodel containing a single compartment with a constant initial value, say 100. Add an constant outflow of 0.01 and an immigration of 2. Run the model several times for a short period (10).

Hello,

Can anybody help? I would like to automatically stop a run when a certain compartment becomes empty. Can this be done more elegantly than this? I have used stop in a variable's equation and it works, but the pop-up is a bit distracting.

Thanks in advance for any help.

Pedro.

Hi,

This looks like a bug in version 5.0. When clearing all displays the y-axis scale is not reset, so that if for example the model displays exponential growth and has run for a long time, and then stopped and run again from time zero, the scale is inadequate for the values displayed.

Any workaround for this?

Best regards,

Pedro.

Hi,

Hello. I am learning Simile and am having troubles understanding the functions that relate to submodels. We are working on a model in which a school has a cookbook of menu items that can be fed to children. Each menu item has a list of ingredients, and these are modeled as two submodels (a stack of ingredients within a stack of menu items). And each menu item has a score associated with it in terms of nutrition, etc. In a given time step, we know how much of each ingredient is stored in the pantry.

Greetings,
I am very new at this. I cannot find the Spatial Grid Display Helper. I was hoping to play with the land-use model from the examples, but it does not seem to be working. http://www.simulistics.com/examples/landuse/landuse.htm
Any advice is appreciated thank you! I am using the trial version.
-Al Joseph
Grad Student
Bioenergy
Dalhousie University
Canada