Search found 56 matches

by mike
Fri Aug 30, 2019 3:53 pm
Forum: Vensim
Topic: Vensim 8 External functions documents & help
Replies: 8
Views: 5879

Re: Vensim 8 External functions documents & help

Much appreciated.
I guess 'Senior' refers to age, not knowledge , for me.
by mike
Fri Aug 30, 2019 12:07 am
Forum: Vensim
Topic: Vensim 8 External functions documents & help
Replies: 8
Views: 5879

Re: Vensim 8 External functions documents & help

I have installed Visual Studio Community 2019 with the Desktop Development with C++ workload.
Will that support the processing called for in the Vensim External functions documentation for Vensim 8 ?
Maybe too simple a question, just want to make sure I have supporting software.
by mike
Thu Aug 29, 2019 9:34 pm
Forum: Vensim
Topic: Vensim 8 External functions documents & help
Replies: 8
Views: 5879

Vensim 8 External functions documents & help

Will Vensim 8 for Windows external functions documentation reference C++ compilation of dlls
using Visual Studio Community using the Desktop Development with C++ workload ?

Guidance appreciated
Thank you,
Mike
by mike
Wed Sep 27, 2017 1:36 am
Forum: Vensim
Topic: Help with model calibration
Replies: 359
Views: 126835

Re: Help with model calibration

My God,
you Vensim help guys have the patience of a Saint.
by mike
Sun Sep 06, 2015 12:53 am
Forum: Vensim
Topic: "Nobody ever gets credit" model
Replies: 5
Views: 4659

Re: "Nobody ever gets credit" model

Thanks for posting this question/challenge/issue Hamilton. Thank you JJ for your insightful comments. Thank you Tom for a great quote : "It seems like the paper doesn't fully document the models and experiments, so it's hard to know what's missing." How many times has that happened to us a...
by mike
Thu Aug 13, 2015 2:10 pm
Forum: Ventity
Topic: Introducing Ventity beta 1
Replies: 2
Views: 4560

Re: Introducing Ventity beta 1

Could you please refer those interested to a document or discussion of Ventity & Vensim interoperability ? Can a Vensim model be loaded into Ventity and modified for the different functionality? Does the Vensim model thus loaded into Ventity have restrictions in terms of its functionality ? Than...
by mike
Mon Aug 03, 2015 1:06 am
Forum: System Dynamics Discussion
Topic: arcane arrays
Replies: 9
Views: 9888

Re: arcane arrays

re; JJ on process Mike Radzicki , Professor at WPI, recommended an approach much like yours in one of his presentations at SD Summer School in July. He recommended thoroughly testing model sub-sections before testing the whole model. Thank you for the reinforcement. You have a good idea here for the...
by mike
Sat Aug 01, 2015 12:40 am
Forum: System Dynamics Discussion
Topic: arcane arrays
Replies: 9
Views: 9888

Re: arcane arrays

JJ says : "About designing good interfaces, It is of course necessary especially as most end users do not participate to the model building and need to compensate for this lacking by a very good interface. But to my opinion there is no interface that compensates fully for the lack of participat...
by mike
Thu Jul 30, 2015 8:30 pm
Forum: System Dynamics Discussion
Topic: arcane arrays
Replies: 9
Views: 9888

Re: arcane arrays

Hi JJ, My gripe about using Vensim arrays may in fact reflect my experience as an APL programmer. The way Vensim forces their limted and to my mind constrained user interface on the use of arrays is to me extremely frustrating. All rants aside, it has been a manageable annoyance. Life ain't perfect ...
by mike
Thu Jul 30, 2015 4:48 pm
Forum: System Dynamics Discussion
Topic: arcane arrays
Replies: 9
Views: 9888

Re: arcane arrays

Good day JJ I always appreciate the issues you post on important SD & SD software issues. I think the use of the word 'arcane' is not sufficiently relevant here. I don't like using Vensim arrays because they are not easy to use. I say that as someone who , in the past, struggled to become and be...
by mike
Fri Oct 11, 2013 12:53 am
Forum: Vensim
Topic: Transitioning from 32 bit to 64 bit environment
Replies: 2
Views: 3527

Re: Transitioning from 32 bit to 64 bit environment

Thank you Admin
by mike
Thu Oct 10, 2013 3:05 am
Forum: Vensim
Topic: Transitioning from 32 bit to 64 bit environment
Replies: 2
Views: 3527

Transitioning from 32 bit to 64 bit environment

Are there any issues with respect to running Vensim DSS
in a 64 bit system after having a bunch of work done ( models , input files , output files, external functions )
in a 32 bit system ?

Does all previous work transition smoothly with exception of the need to re-compile external functions ?
by mike
Wed Sep 18, 2013 2:55 pm
Forum: Vensim
Topic: "Optimal" desktop configuration for running Vensim DSS.
Replies: 2
Views: 3319

Re: "Optimal" desktop configuration for running Vensim DSS.

Thanks for the guidance administrator.
Good day
by mike
Tue Sep 17, 2013 6:45 pm
Forum: Vensim
Topic: "Optimal" desktop configuration for running Vensim DSS.
Replies: 2
Views: 3319

"Optimal" desktop configuration for running Vensim DSS.

Any guidance or ideas about configuring a desktop PC for optimal performance ? I am no technical expert here; my naive view is that there might be some 'optimal' balance between RAM & processor capabilities that would be best for running Vensim DSS at a given price point, say $1200 - $1500 for t...
by mike
Fri May 25, 2012 3:36 pm
Forum: Vensim
Topic: linking Vensim and Fortran, possible ? How ?
Replies: 3
Views: 3515

Re: linking Vensim and Fortran, possible ? How ?

Fortan code can be run via the 'C' language.
Don't recall the details though.
Did it back in the early 1990s.
by mike
Tue Dec 27, 2011 3:59 pm
Forum: Vensim
Topic: Validating one’s version of Vensim on a per release basis.
Replies: 5
Views: 5417

Re: Validating one’s version of Vensim on a per release basi

If there are parts of a Vensim model I am debugging and would like to look at the source code, which I can't do ..... an alternative is to simply take that chunk of Vensim model and run it with Vensim PLE to get a consisitency check. In the future I will try to think then post rather than visa versa...
by mike
Sat Dec 24, 2011 6:34 pm
Forum: Vensim
Topic: Validating one’s version of Vensim on a per release basis.
Replies: 5
Views: 5417

Re: Validating one’s version of Vensim on a per release basi

Thank you Tony,

Let me get back to you on this next week.

Regards,
Mike
by mike
Fri Dec 23, 2011 11:11 pm
Forum: Vensim
Topic: Validating one’s version of Vensim on a per release basis.
Replies: 5
Views: 5417

Re: Validating one’s version of Vensim on a per release basi

Yes, I have a model I am trying to debug but want to do this on my own. My independent debugging would be helped though if all the models provided with Vensim had .vdf files provided too , such that I and all Vensim Users would be able to test the relevant functionality by validating my copy of Vens...
by mike
Fri Dec 23, 2011 5:31 pm
Forum: Vensim
Topic: Validating one’s version of Vensim on a per release basis.
Replies: 5
Views: 5417

Validating one’s version of Vensim on a per release basis.

I am sure the people responsible for maintaining Vensim do extensive and robust tests to ensure each new release is working as per the Manual descriptions of how everything in Vensim should work. I ‘feel’ 99% sure of this being reality. How can any Vensim User be 100% sure that their downloaded vers...
by mike
Thu Oct 13, 2011 10:28 pm
Forum: Vensim
Topic: What improvements would you like to see in Vensim?
Replies: 150
Views: 11206121

Re: What improvements would you like to see in Vensim?

Request #1: Refer to User’s Guide Section 15 Sensitivity Testing Confidence Bounds ; cash flow:Sensitivity Graph It would be nice if one could add an exogenous data time series to this graph. Such that you have the mean value and confidence bounds from the sensitivity run as shown in the User’s Guid...
by mike
Thu Feb 24, 2011 8:15 pm
Forum: System Dynamics Discussion
Topic: Is there an SD archetype for the 'domino theory' ?
Replies: 0
Views: 5100

Is there an SD archetype for the 'domino theory' ?

Lots of gab in the blog-o-sphere on Libya-Egypt turmoil, describing it in terms of the 'domino theory'. Shades of Vietnam War Era wonkery ? Is there an SD archetype for the 'domino theory' ? Does it involve notions of Vensim's Conveyors ? Does it relate to path dependency and hence involve positive ...
by mike
Mon Sep 27, 2010 2:37 am
Forum: Vensim
Topic: trivial issue ; Vensim 5.9e treats "u_s" as "
Replies: 2
Views: 2835

Answered my own question; it is called 'underbar'
and is apparently shown as a space by default but can be set to appear via Model Settings Dialogue.
by mike
Mon Sep 27, 2010 2:10 am
Forum: Vensim
Topic: trivial issue ; Vensim 5.9e treats "u_s" as "
Replies: 2
Views: 2835

trivial issue ; Vensim 5.9e treats "u_s" as "

Is there a way to get a Vensim Version 5.9e model to get variable names that have the underscore character in them ? That is, I would like to have a variable named "u_s" but it comes out as "u s". If I cannot do this, it is not the end of the World but if this is one's preference...
by mike
Wed Jun 02, 2010 2:23 pm
Forum: System Dynamics Discussion
Topic: structure tests for SD models
Replies: 6
Views: 6223

Not sure I am answering your specific question but here is 2 cents on the subject: Vensim's "Reality Checks" may help you gain confidence in a model and a sense of its relevance and practicality in helping solve a problem. I would venture to guess that most SDers strive for a model to be u...
by mike
Mon Mar 08, 2010 9:31 pm
Forum: Vensim
Topic: using reality checks to build models
Replies: 6
Views: 4807

re; one resonse to JJ questions

re; JJ’s questions; Is it possible to blend the two methods? Working with a structural causality method and an estimated behavior of reality at the same time? my 2 cents on JJ's post ; reality check seems a more granular and segmented way to do sensitivity simulations sensitivity simulations let you...