Ventana software support forum

Will the stats tool do what you need?
http://www.vensim.com/documentation/ind ... _stats.htm

I would agree that there are two loops. I don't remember seeing any specific "rules" anywhere for SD though. The most important part of modelling is that the model works and helps you understand the problem you are trying to solve. Have you been through the PLE tutorial at the following ad...

Define them as constants. If someone showed me that equation, I would have no idea what the 300000, 700000 and 720 mean. Add them as constants and you can easily experiment by running SyntheSim and moving the sliders.

How to write this equation in vensim... I'm using PLE IF THEN ELSE(300000< scope<=700000,720,0 ) Production rate =720 m/hr if then else ( 300000 < scope :and: scope <= 700000 , 720 , 0 ) I would avoid putting numbers in there though. Make them constants like if then else ( lower bound < scope :and:...

Can you upload the venapp so we can take a look?

No Vensim training in Australia at all?

None that I know of. Demand in the UK has been low for the past two years, I suppose it would be even lower in Australia.

It's just an image.

Tougher to evaluate Vensim vs iThink when only PLE is on trial (still, iThink trial models cannot be saved which is vexing when they crash). I can issue a trial for one of the other versions if you want. The following may help. http://www.vensim.com/comparison.html Vensim (at least PLE) seems to ha...

All the vensim_show_sketch function does is draw into the window that is provided.

If the window is covered, or too small, you need to change the code for the form to make it work.

It looks like you are getting a sketch, but the container window is too small. What happens if you increase it's size?

Start by making the units for your rates Million litres\day. For example, nominations = nomination yorn * Nomination Quantity / time step units : Million litres\day the division by time step makes sure that you nomination quantity will be emptied at a specific time step. Your model may have been pro...

Can you post the model so we can see the unit errors?

In another tool I vaguely remember using a random number generation step and then, separately, an equation that draws on that random number to effect a delay. That is exactly what you do in Vensim as well. First generate the random number http://www.vensim.com/documentation/index.html?fn_random.htm...

Thanks JJ, I'll raise it as a bug.

Create an outflow, the equation should be
That will empty it when trigger = 1.

Are you able to upload the model and VCD so we can take a look?

To list the other equations, you will need to ensure that all the other subscript combinations are selected (via SPECIAL>SUBSCRIPT|range|elem1|elem2|elmn).

Vensim works fine on Windows 8 so that should be ok.

The bigger question is getting used to the new GUI in Windows 8 (I'm finding it tricky).

If I do check/compare the model result manually with the real output, can it be sufficient for reliability check? No. If the model matches real data, then that is a good sign that the model is working correctly. If I check through "Model Check" and "Unit Check", is it sufficient...

Hello JJ, I'm not as familiar with reality check as I should be, but I'll do my best to help. Hopefully Tom will find time today to take a quick look and offer some advice as well. I'd say use the 2nd construct of the reality check. As you say, it will continue to work no matter how large the "...

Hello,

All you do is log into the download area at
http://www.vensim.com/php-bin/download.html

From here you can upgrade or extend the maintenance on your licence.

If you want a formal quote, email me at vensim@vensim.com with your licence details and I'll be happy to help.

Tony.

Thanks for the bug report, I'll see if I can get it fixed quickly.

Can you explain why it is not working on the model reader 6.0?

It would really help you a lot if you went through the whole tutorial at
http://www.public.asu.edu/~kirkwood/sysdyn/VenPLE.pdf

You need to look at the numbers and work out why they are not what you expect. The tutorial will take you though building a simple model and examining the output.

You can also try a Model->Reform/Clean and save the model again. This often solves a lot of things.

But it would also help if you could email the model/venapp to me as there may be a bug which I can look into and fix.