Search found 3947 matches

by Administrator
Thu Dec 02, 2021 1:52 pm
Forum: Vensim
Topic: Simultaneous equations error
Replies: 1
Views: 25

Re: Simultaneous equations error

You've got a bit of a logic problem in your model. First of all, you've got "aluminium to be recycled (kg)", that's fine. This flows into "Aluminium Recycling Process" where it should remain until it is either recycled or not. The problem is you have "non-recyclable aluminium" and "recyclable alumin...
by Administrator
Fri Nov 26, 2021 8:44 am
Forum: Vensim
Topic: Compressing zero values in arrays
Replies: 1
Views: 71

Re: Compressing zero values in arrays

I would try and combine the two subscript ranges into one. How tricky would it be in your case? For example, machine : washing machine electric, cooker gas, cooker electric, cooker fire, tv electric That way you would not have any zeroes in the array. If you then need to calculate energy consumption...
by Administrator
Tue Nov 23, 2021 3:26 pm
Forum: Vensim
Topic: problems running model "Based on" history run
Replies: 8
Views: 182

Re: problems running model "Based on" history run

What format are you saving your model in (VMFX or MDL)?

If MDL, try changing to VMFX. MDL files are parsed each time they are loaded which marks them as "changed". This causes the model match with the existing VDFX to fail. With a binary format model (VMFX), it should work.
by Administrator
Mon Nov 22, 2021 2:34 pm
Forum: Vensim
Topic: installation error
Replies: 26
Views: 1776

Re: installation error

Is your office computer in Chinese?
by Administrator
Mon Nov 22, 2021 11:57 am
Forum: Vensim
Topic: Error in functions and measurement units
Replies: 8
Views: 164

Re: Error in functions and measurement units

Looking at the last one. You have "Infiltration" measured in "cm/Month". But the output of IF THEN ELSE is either "Soil temperature 1" or zero and "Soil temperature 1" is measured in "Month". "cm/Month" is definitely not equal to "Month". Also, why is "Soil temperature 1" measured in "Month"? Same q...
by Administrator
Mon Nov 22, 2021 8:51 am
Forum: Vensim
Topic: Global variables in VDI files
Replies: 2
Views: 61

Re: Global variables in VDI files

I'm fairly certain it cannot be done at present. But it seems like it could be easy enough to do. I'll create a ticket in our system to add it in a future release.
by Administrator
Fri Nov 19, 2021 7:39 am
Forum: Vensim
Topic: DELAY1
Replies: 3
Views: 89

Re: DELAY1

I'm not sure I understand what you are asking for.

Have you looked at the sample model showing how the DELAY functions work?
by Administrator
Thu Nov 18, 2021 12:16 pm
Forum: Vensim
Topic: Recursive function
Replies: 6
Views: 136

Re: Recursive function

You will need variables
P
S
W
Pi

P will probably be a level with initial value P0. That should get you started.
by Administrator
Thu Nov 18, 2021 12:08 pm
Forum: Vensim
Topic: Recursive function
Replies: 6
Views: 136

Re: Recursive function

Is "t" time? If yes, this is easy in Vensim.
by Administrator
Tue Nov 16, 2021 7:26 am
Forum: Vensim
Topic: units check errors
Replies: 6
Views: 156

Re: units check errors

I'd suggest doing one of the many Vensim tutorials such as the one below. They will teach you how to define units.

http://www.public.asu.edu/~kirkwood/sysdyn/SDRes.htm
On this page you will find a really good Vensim PLE tutorial.
by Administrator
Mon Nov 15, 2021 1:01 pm
Forum: Vensim
Topic: installation error
Replies: 26
Views: 1776

Re: installation error

So why i use the new file en09000100.vrf to replace the old one, then it works? I don't know. For some reason, certain machines do not run the installation properly. And we have been unable to find out why this is. And even though I've asked users in this thread for information, they have not repli...
by Administrator
Mon Nov 15, 2021 12:30 pm
Forum: Vensim
Topic: problems running model "Based on" history run
Replies: 8
Views: 182

Re: problems running model "Based on" history run

I'd need the model to run it through the debugger to see why it's not running.

If you can reproduce the problem in a smaller model, could you upload that (or email it to us)?
by Administrator
Mon Nov 15, 2021 10:33 am
Forum: Vensim
Topic: problems running model "Based on" history run
Replies: 8
Views: 182

Re: problems running model "Based on" history run

Can you upload the model?
by Administrator
Mon Nov 15, 2021 9:57 am
Forum: Vensim
Topic: cost
Replies: 8
Views: 109

Re: cost

It's too complicated. Nesting equations is bad practice as it makes things difficult to debug.

Start by simplifying your equations. Then add units to the parameters in your model and make sure it passes the units test. Hopefully then the problem will show itself.
by Administrator
Mon Nov 15, 2021 9:33 am
Forum: Vensim
Topic: cost
Replies: 8
Views: 109

Re: cost

ok. I'm probably not going to be able to help much as I cannot read the model parameters. One note. You really need to simplify this equation. Embedding function calls (such as DELAY1) means you have no way of debugging and finding out which one of these IF THEN ELSE statements is causing the proble...
by Administrator
Mon Nov 15, 2021 8:33 am
Forum: Vensim
Topic: cost
Replies: 8
Views: 109

Re: cost

You are going to have to translate things for us to help.

1. I cannot find a parameter called "cost".
2. I cannot find a parameter called "work-in-progress p"
3. The model has no units at all. Adding units and making sure your model passes this basic check usually reveals any common errors.
by Administrator
Mon Nov 15, 2021 8:03 am
Forum: Vensim
Topic: cost
Replies: 8
Views: 109

Re: cost

Can you upload your model? It was not attached to the original post.
by Administrator
Sat Nov 13, 2021 8:24 am
Forum: Vensim
Topic: Output difference between model and dll
Replies: 3
Views: 337

Re: Output difference between model and dll

Can you email us about this? I'll need to run the model through the debugger to figure out what is wrong.
by Administrator
Thu Nov 11, 2021 7:42 am
Forum: Vensim
Topic: Publish to Web
Replies: 20
Views: 3123

Re: Publish to Web

Thank you so much! That green triangle worked perfectly haha. I am just now learning how to use Vensim for the first time and am enjoying playing with this model. Do you have any advice for playing with Venapps and games (https://vensim.com/vensim-applications/#vensim-applications)? Is this somethi...
by Administrator
Wed Nov 10, 2021 1:57 pm
Forum: Vensim
Topic: If A affect B, can B affect A?
Replies: 5
Views: 460

Re: If A affect B, can B affect A?

You've registered on the forum as a PLE user, please update your profile with your licence serial number.
by Administrator
Wed Nov 10, 2021 1:37 pm
Forum: Vensim
Topic: If A affect B, can B affect A?
Replies: 5
Views: 460

Re: If A affect B, can B affect A?

Have you done any of the Vensim tutorials yet?

Try here,
http://www.public.asu.edu/~kirkwood/sysdyn/SDRes.htm
On this page you will find a really good Vensim PLE tutorial. This shows you how to create a stock and flow where they influence each other.
by Administrator
Wed Oct 27, 2021 12:52 pm
Forum: Vensim
Topic: installation error
Replies: 26
Views: 1776

Re: installation error

chenho wrote: Wed Oct 27, 2021 12:42 pm I used the name that I input when downloading it from the website.
Can you let me know what that was exactly please? Did it contain any non-ASCII characters? I'm trying to work out why it is not working for you.
by Administrator
Wed Oct 27, 2021 12:24 pm
Forum: Vensim
Topic: installation error
Replies: 26
Views: 1776

Re: installation error

If you save the attached zip file to
C:\Users\Public\Vensim\PLE

and unzip, hopefully PLE will now work for you.

Please let me know what username you are using when installing though in case that causes a problem.
by Administrator
Wed Oct 27, 2021 12:20 pm
Forum: Vensim
Topic: installation error
Replies: 26
Views: 1776

Re: installation error

When you install, what user names are you using?