Search found 23 matches

by rosenm
Thu Nov 26, 2020 8:14 pm
Forum: Vensim
Topic: Optimization
Replies: 2
Views: 463

Optimization

Please, any detailed optimization tutorial written from humans to humans?
by rosenm
Thu Nov 26, 2020 8:09 pm
Forum: Vensim
Topic: What improvements would you like to see in Vensim?
Replies: 120
Views: 82083

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

Any chance to enrich the options for the lines in the graph - thickness, color, pattern, font and size for axes?
by rosenm
Tue Dec 10, 2019 7:52 pm
Forum: Vensim
Topic: Saving sensitivity graph
Replies: 2
Views: 868

Re: Saving sensitivity graph

Thank you very much!
by rosenm
Tue Dec 10, 2019 4:08 pm
Forum: Vensim
Topic: Saving sensitivity graph
Replies: 2
Views: 868

Saving sensitivity graph

Hello!
How to save the sensitivity graph?
by rosenm
Mon Dec 09, 2019 7:57 pm
Forum: Ventity
Topic: Integration method
Replies: 3
Views: 1766

Re: Integration method

Although the use of Vensim is not typical for engineering, it is very suitable for simulation of different engineering systems, mainly because of the presence of the very stable RK4auto, without mentioning the convenient modeling environment. It will not be a bad thing to have this capability in Ven...
by rosenm
Mon Dec 09, 2019 6:25 pm
Forum: Ventity
Topic: Integration method
Replies: 3
Views: 1766

Integration method

Hello!
As I understand, the Euler method is used for the integration. I wonder if more sophisticated methods will be implemented?
by rosenm
Tue Sep 26, 2017 1:10 pm
Forum: Vensim
Topic: Limitation of number of downloads
Replies: 6
Views: 1868

Re: Limitation of number of downloads

Sorry, I have to check this. Thank you very much for your assistance.
by rosenm
Tue Sep 26, 2017 11:56 am
Forum: Vensim
Topic: Limitation of number of downloads
Replies: 6
Views: 1868

Re: Limitation of number of downloads

I sent it again!
Thank you
by rosenm
Tue Sep 26, 2017 9:21 am
Forum: Vensim
Topic: Limitation of number of downloads
Replies: 6
Views: 1868

Re: Limitation of number of downloads

Yesterday I already sent an email. If you have not received it, please tell me.
Kind regards
by rosenm
Tue Sep 26, 2017 7:39 am
Forum: Vensim
Topic: Limitation of number of downloads
Replies: 6
Views: 1868

Limitation of number of downloads

Hello!
I have tried to download Vensim PLE+ 7.1 few times because of very slow download speed and received a message: "maximum number of download times is reached". Now I don't have a possibility to download the software. Please, tell me what to do?

Kind regards
Rosen MITREV, TU-Sofia
by rosenm
Wed Jul 05, 2017 8:04 am
Forum: Vensim
Topic: How to change variable type
Replies: 2
Views: 987

Re: How to change variable type

Thank you very much!
by rosenm
Wed Jul 05, 2017 6:31 am
Forum: Vensim
Topic: How to change variable type
Replies: 2
Views: 987

How to change variable type

Hello! I'd like to perform a sensitivity analysis, but I get the following error - "the variable is wrong type, must be constant" (the constant is beta in the attached model). Any trials to change the type of beta from auxiliary to constant are unsuccessful. What to do? Another issue- although the b...
by rosenm
Thu Feb 09, 2017 1:13 pm
Forum: Vensim
Topic: Very slow performance
Replies: 5
Views: 1677

Re: Very slow performance

Ok, thank you!
by rosenm
Thu Feb 09, 2017 10:04 am
Forum: Vensim
Topic: Very slow performance
Replies: 5
Views: 1677

Re: Very slow performance

It is a star moving in gravitational field of the galaxy:)
by rosenm
Thu Feb 09, 2017 9:42 am
Forum: Vensim
Topic: Very slow performance
Replies: 5
Views: 1677

Very slow performance

Hello!
I have noticed that if in the graph line width is set to 1, then all is OK. But if line width is 2, the performance is very bad. In the case of more points I need to restart the computer. Please, see the attached file.
Is this a bug or is normal behaviour> Vensim PLE, last version.
by rosenm
Thu Oct 27, 2011 8:28 am
Forum: Vensim
Topic: Help with Graph
Replies: 2
Views: 1335

Re: Help with Graph

Ok, thanks
by rosenm
Wed Oct 26, 2011 4:28 pm
Forum: Vensim
Topic: Help with Graph
Replies: 2
Views: 1335

Help with Graph

Hello everybody! In the attached file there is two graphs - x1-y1 and x2-y2. I'd like to plot these lines in one graph. Please help. Vensim PLE.
Thanks in advance
Rosen
by rosenm
Tue Nov 30, 2010 8:50 am
Forum: Vensim
Topic: reccurent sequence
Replies: 5
Views: 2319

Ok, Thank you very much Tom
by rosenm
Mon Nov 29, 2010 5:00 pm
Forum: Vensim
Topic: reccurent sequence
Replies: 5
Views: 2319

Thanks for the answer;
About the nonlinear system - i am wondering , is there a method like realized in the attached file (for linear system 4x+2y=14; 2x+5y=-5), but applicable to nonlinear systems.


[Edited on 11-29-2010 by rosenm]
by rosenm
Mon Nov 29, 2010 3:18 pm
Forum: Vensim
Topic: reccurent sequence
Replies: 5
Views: 2319

reccurent sequence

Hello colleagues!
I would like to know:
1)how to solve reccurent sequences in Vensim PLE, for example: x(t+1)=x(t)+1;
2) how to solve system of nonlinear algebraic equations -for example x^2+y^25, x^2-y^2=1;
Thanks in advance
by rosenm
Wed Aug 19, 2009 1:38 pm
Forum: Vensim
Topic: time
Replies: 5
Views: 2112

sorry for my inattention:)) you are right
Thanks
by rosenm
Tue Aug 18, 2009 10:19 am
Forum: Vensim
Topic: time
Replies: 5
Views: 2112

Thank you very much for the answers, that is what I need, but "variable to be used if level is equal to 100" is a function of time and at each time step has different values, one of which is that I need (10 in this case, please see the attached picture).How to store this value (10 ) as a constant so...
by rosenm
Sat Aug 15, 2009 11:21 am
Forum: Vensim
Topic: time
Replies: 5
Views: 2112

time

Hi colleagues, how to find atomatically moment of time when the stock is equal to 100 for example and use it (the moment of time as numerical value) in some calculations?
Thanks in advance

[Edited on 8-15-2009 by rosenm]