It worked well, thanks.Administrator wrote: ↑Thu Sep 23, 2021 6:32 am You can load both of them, or edit using a text editor and copy/paste the contents of one into the other.
Search found 54 matches
- Thu Sep 23, 2021 9:07 am
- Forum: Vensim
- Topic: How to combine two .out files?
- Replies: 2
- Views: 1450
Re: How to combine two .out files?
- Thu Sep 23, 2021 5:01 am
- Forum: Vensim
- Topic: How to combine two .out files?
- Replies: 2
- Views: 1450
How to combine two .out files?
I have two different files with '.out' kind that contain two sets of calibrated constants values. I want to combine and use as one file in order to run a sensitivity analysis for my model.
Can someone advise please?
Can someone advise please?
- Thu Jun 18, 2020 11:34 am
- Forum: Vensim
- Topic: Typing the name of a variable using subscripts and superscripts
- Replies: 1
- Views: 1308
Typing the name of a variable using subscripts and superscripts
How can I type the name of a variable using subscripts and superscripts like in Word Microsoft? The Editor only allows me to type letters in one line.
- Sun May 24, 2020 1:24 am
- Forum: Vensim
- Topic: Calibrating various scenarios beside the baseline
- Replies: 3
- Views: 1888
Re: Calibrating various scenarios beside the baseline
I think the answer depends on whether the scenarios differ only in terms of future policy, or also past variables that would affect the fit to history. Normally I would think of there being a single baseline, with policy scenarios varying around that. The way to implement this is to calibrate the m...
- Sun May 24, 2020 12:28 am
- Forum: Vensim
- Topic: Calibrating various scenarios beside the baseline
- Replies: 3
- Views: 1888
Calibrating various scenarios beside the baseline
I have calibrated the baseline scenario in my model and I have established two more possible scenarios. Does the software need to recalibrate and re-estimate constants based on the two new scenarios or it only needs to run simulation for them using the baseline estimations?
- Thu May 21, 2020 12:04 pm
- Forum: Vensim
- Topic: Warning "Bad indirect CWP1322"
- Replies: 4
- Views: 2137
Re: Warning "Bad indirect CWP1322"
I just sent you an email with my serial number.Administrator wrote: ↑Thu May 21, 2020 11:44 am If you email us with your serial number, I can give you access to the 8.1 installer (which should make this problem go away).
- Thu May 21, 2020 7:55 am
- Forum: Vensim
- Topic: Warning "Bad indirect CWP1322"
- Replies: 4
- Views: 2137
Re: Warning "Bad indirect CWP1322"
This is on Mac with the OS Catalina, and by the way my Vensim is DSS Professional version 8.0.9 X64.
- Thu May 21, 2020 6:55 am
- Forum: Vensim
- Topic: Warning "Bad indirect CWP1322"
- Replies: 4
- Views: 2137
Warning "Bad indirect CWP1322"
Sometimes at the end of my simulation or optimisation runs I'm getting the warning "Bad indirect CWP1322". I have to close and reopen my model so I can be able to click and open the options panels or rum my simulation or optimisation.
Can you tell me what the warning refers to?
Can you tell me what the warning refers to?
- Wed May 20, 2020 12:36 am
- Forum: Vensim
- Topic: Any built-in options to relocate and re-layout the parameters places?
- Replies: 1
- Views: 1218
Any built-in options to relocate and re-layout the parameters places?
I have thousands of parameters connected to one another in my model, and when I started building them up and made the connections between them with arrows, I was not much concerned about the aesthetic aspect of the model. Now I can see a big dish of spaghetti which makes it hard for the readers to u...
- Sat May 09, 2020 10:01 pm
- Forum: Vensim
- Topic: Confusion about the correlation time unit in RANDOM PINK NOISE funtion
- Replies: 5
- Views: 2528
Re: Confusion about the correlation time unit in RANDOM PINK NOISE funtion
The rule of thumb for 1/3 the smallest delay is reasonable, but sometimes not sufficient. Really the rule should be 1/3 the shortest effective time constant, whether it is in a negative or positive loop, and this is not always known. The simplest thing to do is do some testing - lower the time step...
- Sat May 09, 2020 9:22 am
- Forum: Vensim
- Topic: Confusion about the correlation time unit in RANDOM PINK NOISE funtion
- Replies: 5
- Views: 2528
Re: Confusion about the correlation time unit in RANDOM PINK NOISE funtion
Thanks for your clear, helpful explanation. As long as we are on the time subject, I was wondering what adjustment time or delay means in a model and why we have to consider it while choosing the time step? Since I've been told the time step I select should be 1/3 of the smallest delay in my model. ...
- Sat May 09, 2020 8:06 am
- Forum: Vensim
- Topic: Confusion about the correlation time unit in RANDOM PINK NOISE funtion
- Replies: 5
- Views: 2528
Confusion about the correlation time unit in RANDOM PINK NOISE funtion
The initial and final time in my model is 1985 and 2016, and I have set TIME STEP to 0.0625. I am using RANDOM PINK NOISE function which contains correlation time. Since I want the picked up data to have a path dependency behaviour of six months, should I put 0.5 (i.e. half a year) as correlation or...
- Fri Apr 10, 2020 2:08 pm
- Forum: Vensim
- Topic: Notification "Setting up the simulation"
- Replies: 2
- Views: 1555
Re: Notification "Setting up the simulation"
Thanks very much.Administrator wrote: ↑Fri Apr 10, 2020 1:50 pm You are getting into problems as there is an error in your model. Run it (not optimize) and then look at the graph for "Bev Scientific Knowledge Development Stock". Is that correct?
Yes you are right!
- Fri Apr 10, 2020 1:19 pm
- Forum: Vensim
- Topic: Notification "Setting up the simulation"
- Replies: 2
- Views: 1555
Notification "Setting up the simulation"
I'm trying to optimise my model but the simulation run get stuck into the notification ""setting up the simulation" with no run.
I have attached the model here.
Could you please help me with the issue?
I have attached the model here.
Could you please help me with the issue?
- Mon Mar 30, 2020 12:58 pm
- Forum: Vensim
- Topic: TIME STEP and historical data
- Replies: 14
- Views: 4969
Re: TIME STEP and historical data
If you think about a run with 4 time steps, the random draws might be Time 1 2 3 4 Value 3 8 2 6 If you halve the time step, you get Time 0.5 1 1.5 2 2.5 3 3.5 4 Value 3 8 2 6 1 7 7 9 The value 2 now occurs at time 1.5 instead of time 2, etc. In a real model, it's more complex than that, because yo...
- Mon Mar 30, 2020 12:36 pm
- Forum: Vensim
- Topic: TIME STEP and historical data
- Replies: 14
- Views: 4969
Re: TIME STEP and historical data
I'd suggest putting in some realistic bounds on the things you are allowing the optimizer to modify, if you do this, the optimal solution is identical for time step = 0.5 and 0.03125. I put some realistic bounds. The eventual results seem identical, though not entirely. Why does the outcome of pink...
- Mon Mar 30, 2020 11:49 am
- Forum: Vensim
- Topic: TIME STEP and historical data
- Replies: 14
- Views: 4969
Re: TIME STEP and historical data
Administrator wrote: ↑Mon Mar 30, 2020 10:44 am If you upload the model, we can take a look. Make sure you upload all files required to run it.
- Mon Mar 30, 2020 10:40 am
- Forum: Vensim
- Topic: TIME STEP and historical data
- Replies: 14
- Views: 4969
Re: TIME STEP and historical data
Have I observed and detected a right reason for it?? What's your recommendation to fix it? As I've suggested, you should fix all the units errors in your model first. This will lead you to where all the errors are. I have created a new small, simple model and I have used a pink noise in it. Again w...
- Mon Mar 30, 2020 7:58 am
- Forum: Vensim
- Topic: TIME STEP and historical data
- Replies: 14
- Views: 4969
Re: TIME STEP and historical data
The best thing to do is create some custom graphs that compare the model to the data, and then do some hand calibration to see what's going on. I think I figured what the issue can be. I'm using several RANDOM PINK NOISE functions in my model and it seems they are really sensitive to the change of ...
- Sun Mar 29, 2020 11:29 am
- Forum: Vensim
- Topic: TIME STEP and historical data
- Replies: 14
- Views: 4969
TIME STEP and historical data
Since the historical data tat I am using to optimise and calibrate my model has been collected annually, should I define the TIME STEP annually too? Because the smaller TIME STEP that I use, the worse the optimisation payoff I obtain for the model.
- Fri Mar 27, 2020 1:25 pm
- Forum: Vensim
- Topic: Low optimisation speed
- Replies: 11
- Views: 4701
Re: Low optimisation speed
I don't think the SSD will matter much for optimizations, because it's not writing much data until the end. I didn't notice in your first post that it was a Ryzen 7. This could be an AMD/Intel difference. Historically, AMDs had more cores, but Intels were about twice as fast per core. I thought the...
- Fri Mar 27, 2020 10:53 am
- Forum: Vensim
- Topic: Low optimisation speed
- Replies: 11
- Views: 4701
Re: Low optimisation speed
Thanks.
I just sent all the files.
- Fri Mar 27, 2020 9:07 am
- Forum: Vensim
- Topic: Low optimisation speed
- Replies: 11
- Views: 4701
Re: Low optimisation speed
Since my model was being optimised really slowly on my MacBook air (Macintosh with CPU Core i5 1.6Ghz , and 4 GB Ram), for example each simulation run would take at least 5 secs, I purchased a very powerful PC (Windows with CPU AMD Ryzen 7 (3700X) 8 core, and 32 GB Ram) so I could accelerate the op...
- Fri Mar 27, 2020 7:12 am
- Forum: Vensim
- Topic: Low optimisation speed
- Replies: 11
- Views: 4701
- Fri Mar 27, 2020 4:11 am
- Forum: Vensim
- Topic: Low optimisation speed
- Replies: 11
- Views: 4701
Re: Low optimisation speed
I dont exactly know what compiling means in this particular situation, but I am doing the same process, borrowing the different required files from their sources individually.