Search found 3804 matches

by tomfid
Sun Nov 02, 2014 2:34 am
Forum: Vensim
Topic: Are there inconsistencies in the Vensim DLL ?
Replies: 6
Views: 7034

Re: Are there inconsistencies in the Vensim DLL ?

I think I've found the bug - should be OK in the next release.
by tomfid
Fri Oct 31, 2014 7:25 pm
Forum: Vensim
Topic: Are there inconsistencies in the Vensim DLL ?
Replies: 6
Views: 7034

Re: Are there inconsistencies in the Vensim DLL ?

FWIW, with SHOWMACRO|1 I do get consistent behavior (showing "#modelFractionalRate>CONTINUOUSRATE#" from either end).

There is an inconsistency for SHOWMACRO|0 - for some reason it doesn't suppress the macro variable in the uses direction.
by tomfid
Fri Oct 31, 2014 5:37 pm
Forum: Vensim
Topic: venext - FUNC_DESC
Replies: 4
Views: 4233

Re: venext - FUNC_DESC

Reorder your dimensions as x[Range2-element1,Range1] - it always iterates over the last dimensions first, so this should be the same as before.
by tomfid
Thu Oct 30, 2014 3:12 pm
Forum: Vensim
Topic: Are there inconsistencies in the Vensim DLL ?
Replies: 6
Views: 7034

Re: Are there inconsistencies in the Vensim DLL ?

I'd try SHOWMACRO|1 - in the meantime I'll take a look in the debugger.
by tomfid
Wed Oct 29, 2014 7:04 pm
Forum: Vensim
Topic: Variables Missing from View
Replies: 8
Views: 5461

Re: Variables Missing from View

NewModel_Oct27b-restore3.mdl NewModel_Oct15-Reorg.mdl The bad news: I still don't know why this happened. The good news: I was able to restore the diagram from the Oct_15 version. First, I edited to the 15 file to break up the large diagram into several chunks. Then, using a text editor, I copied t...
by tomfid
Wed Oct 29, 2014 5:14 pm
Forum: Vensim
Topic: Are there inconsistencies in the Vensim DLL ?
Replies: 6
Views: 7034

Re: Are there inconsistencies in the Vensim DLL ?

You might try including an .ini file in the .vpm that you're feeding to the .dll, with Tools>Options>Settings>Show Macro Variables set. My first guess would be that it's set to Hide (which is the default), but the Uses call is forgetting to check the attribute. Otherwise I'll have to take a look in ...
by tomfid
Wed Oct 29, 2014 5:10 pm
Forum: Vensim
Topic: Variables Missing from View
Replies: 8
Views: 5461

Re: Variables Missing from View

The 22b version looks corrupted as well. Only about 10-20% of the first Reservoir view loads. It's still not clear what the problem really is. The diagram is large, but I've seen bigger, so I don't think that's the issue. Generally, switching back and forth between text and sketch view can cause sma...
by tomfid
Tue Oct 28, 2014 10:48 pm
Forum: Vensim
Topic: Variables Missing from View
Replies: 8
Views: 5461

Re: Variables Missing from View

I can see the problem, but not sure how it happened. Do you have any earlier versions, in which they're still present on the diagram, that we could compare?
by tomfid
Tue Oct 28, 2014 10:41 pm
Forum: Vensim
Topic: Delay 1 behaviour
Replies: 2
Views: 2464

Re: Delay 1 behaviour

NobugToo.mdl Good question. The difference is in the initialization. See attached, to which I've added an instance of the DELAY1i function, which corresponds with your explicit structure. The simple DELAY1 function is initialized in equilibrium, so that the initial outflow equals the initial inflow...
by tomfid
Fri Oct 24, 2014 12:34 pm
Forum: Vensim
Topic: Unable to complete graph
Replies: 3
Views: 2810

Re: Unable to complete graph

I can't replicate this - it works fine for me. Usually this kind of thing indicates a failure to find the dataset, or a bad/empty dataset. Where is the model file when you're _not_ running it in the Samples directory? You could try pinning your custom graph on the sketch as an I/O object, and see if...
by tomfid
Tue Oct 21, 2014 3:59 pm
Forum: Vensim
Topic: Opening multiple Vensim models at the same time (Wondows 8)
Replies: 6
Views: 5089

Re: Opening multiple Vensim models at the same time (Wondows

You can open two instances of the application and run independently in those, but they won't have any connection.
by tomfid
Tue Oct 21, 2014 3:54 pm
Forum: Vensim
Topic: Vensim PLE Silent Installation
Replies: 1
Views: 1941

Re: Vensim PLE Silent Installation

We don't generally permit this because it bypasses the license agreement, but if you're setting up a computer lab, contact us at vensim@vensim.com and we may be able to work it out.
by tomfid
Mon Oct 20, 2014 4:01 pm
Forum: Vensim
Topic: Get Auxiliary Value At Specific Time
Replies: 3
Views: 2161

Re: Get Auxiliary Value At Specific Time

A small word of caution: A formulation that tests for Time = Value can fail unexpectedly due to roundoff error, especially when TIME STEP is not a power of 2. To protect against this, you can check against Value <= Time < Value + TIME STEP, or use the PULSE function with width TIME STEP as your even...
by tomfid
Fri Oct 10, 2014 10:44 pm
Forum: Vensim
Topic: How can I use a model with database operations in java ?
Replies: 10
Views: 4208

Re: How can I use a model with database operations in java ?

Also, using "1" for the runname is theoretically OK, but potentially troublesome, because that means your vdf will be named 1.vdf, which might have side effects. Can't say as I don't do it.
by tomfid
Fri Oct 10, 2014 6:07 pm
Forum: Vensim
Topic: Ventity
Replies: 13
Views: 9784

Re: Ventity

It seems to have died for no reason before the last 26 mails went out, and you were among the unlucky. Sorry. Should come now.
by tomfid
Fri Oct 10, 2014 5:43 pm
Forum: Vensim
Topic: Ventity
Replies: 13
Views: 9784

Re: Ventity

Strange. The server thinks the announcement went out. I'll check the details, and forward to both of you separately.
by tomfid
Thu Oct 09, 2014 10:27 pm
Forum: Vensim
Topic: Running incremental optimizations
Replies: 6
Views: 5508

Re: Running incremental optimizations

SEED=0 is new, with the new random number generator in 6.3. http://www.vensim.com/documentation/optimizationoptions.htm?zoom_highlightsub=seed Note that random number stream IDs and NOISE SEED within a model behave differently. http://www.vensim.com/documentation/noise_seed.htm?zoom_highlightsub=seed
by tomfid
Thu Oct 09, 2014 3:41 pm
Forum: Vensim
Topic: Ventity
Replies: 13
Views: 9784

Re: Ventity

You missed something ... Did you put yourself on the list at ventity.biz? I'll check, but take a look in your spam folder perhaps.
by tomfid
Thu Oct 09, 2014 2:48 am
Forum: Vensim
Topic: How can I use a model with database operations in java ?
Replies: 10
Views: 4208

Re: How can I use a model with database operations in java ?

Are you using a recent version? There were some problems in the ODBC example prior to 6.2 or 6.3, as I recall.
by tomfid
Tue Oct 07, 2014 5:35 pm
Forum: Vensim
Topic: Running incremental optimizations
Replies: 6
Views: 5508

Re: Running incremental optimizations

I think you don't want RESUME; that resumes at a time. http://www.vensim.com/documentation/25345.htm Instead you can either use BASED|previousrun.vdf or READCIN|previousrun.out (BASED expects a vdf and is probably simpler if there are other change inputs; otherwise you'd have to use READCIN/ADDCIN t...
by tomfid
Tue Oct 07, 2014 5:24 pm
Forum: Vensim
Topic: Running incremental optimizations
Replies: 6
Views: 5508

Re: Running incremental optimizations

it would be nice if there were a condition which would make Vensim always use a different seed when beginning an optimization
There is - set the :SEED to 0.
by tomfid
Fri Oct 03, 2014 1:44 am
Forum: Vensim
Topic: Ventity
Replies: 13
Views: 9784

Re: Ventity

Thanks. This sounds like a cool model, due to the real options angle - sell all the tickets up front and guarantee revenue? Or hold some for later in the season, and take your chances on the ups and downs of performance? Good luck with the model.
by tomfid
Fri Oct 03, 2014 1:39 am
Forum: Vensim
Topic: an amateur question
Replies: 5
Views: 3076

Re: an amateur question

1) from Little's Law, the average residence time in a stock is (stock/outflow). If you need more disequilibrium detail, you can create an explicit coflow to keep track of accumulating time. I think there have been a couple threads here on the topic. Something like http://www.ventanasystems.co.uk/for...
by tomfid
Tue Sep 30, 2014 2:06 pm
Forum: Vensim
Topic: Subscript combinations as a variable
Replies: 4
Views: 2452

Re: Subscript combinations as a variable

Just in case you haven't discovered it, you can build up subscripts hierarchically, which might make the 1-dimension idea easier:

Code: Select all

thingsthatfly : airplane, helicopter
thingsthatroll : car, truck
transportmode: thingsthatfly, thingsthatroll