Search found 13 matches

by geamaro
Thu Nov 18, 2010 2:38 pm
Forum: Vensim
Topic: Saving VGD definition of sensitivity graph
Replies: 1
Views: 2017

Saving VGD definition of sensitivity graph

Hello all,

Is there a way to save a VGD file from a sensitivity graph in DSS?

Thank you in advance!
by geamaro
Fri Nov 05, 2010 5:02 pm
Forum: Vensim
Topic: Sensitivity Graphs Customization
Replies: 1
Views: 1857

Sensitivity Graphs Customization

Hello All! Is there a way to customize the axis, colors, scale etc. of the sensitivity and probability graphs (bar) generated after a sensitivity analysis in DSS? I can customize the colors of the sensitivity graph only, but can´t remove the simulation name, change the axis names and some other aspe...
by geamaro
Sat Oct 30, 2010 10:19 pm
Forum: Vensim
Topic: Law Modeling: an example?
Replies: 3
Views: 2511

Thank you both JJ and Bob... I´m just wondering a way to represent the efects of Brazil´s environmental law over Amazon deforestation and over agriculture GDP. I would like to know how the dinamics expressed by the law influences economic development of this region. Hard word of course... JJ, I´ll t...
by geamaro
Fri Oct 29, 2010 11:41 pm
Forum: Vensim
Topic: Law Modeling: an example?
Replies: 3
Views: 2511

Law Modeling: an example?

Dear friends,

Does someone have a model that simulates the effects of law changes, to be used as an example?

Thanks in advance.

G.
by geamaro
Sun Aug 01, 2010 11:39 pm
Forum: Vensim
Topic: S-shaped growth with maximum and minimum absolute points
Replies: 2
Views: 2299

Thank you Karan!

Your example just enlightme!!

Best wishes,

George
by geamaro
Fri Jul 30, 2010 2:50 pm
Forum: Vensim
Topic: NPV Calculations at the end of a projected time
Replies: 4
Views: 2829

Thank you both, JJ and Bob...
by geamaro
Fri Jul 30, 2010 2:01 pm
Forum: Vensim
Topic: S-shaped growth with maximum and minimum absolute points
Replies: 2
Views: 2299

S-shaped growth with maximum and minimum absolute points

Can someone show me the basic structure of a s-shaped growth where I can control the top growth at the time, its end and the points of minimum and maximum absolute? Thinking in terms of productivity curve of a fruit in time, for example: we know when the trees begin to produce and what is the expect...
by geamaro
Tue Jul 27, 2010 6:58 pm
Forum: Vensim
Topic: NPV Calculations at the end of a projected time
Replies: 4
Views: 2829

The most appropriate way of modeling financial variables in a project (or simulation an agricultural production system) would then consider stocks and flows of capital? Payments as flows to costs and sales as flows to revenue?? Somebody can point a paper with such discussion and model as a guide??? ...
by geamaro
Tue Jul 27, 2010 4:43 pm
Forum: Vensim
Topic: NPV Calculations at the end of a projected time
Replies: 4
Views: 2829

NPV Calculations at the end of a projected time

In Vensim the NPV calculation generates a cash flow adjusted by the rate of interest. The final value should be the NPV itself. However, how to subtract the investment (year 0) value of that NVP? Something like that: Project NVP = NPV(Project Cash Flow, Interest, 0, 1) - Initial Investments Thak you...
by geamaro
Thu Oct 30, 2008 4:31 pm
Forum: Vensim
Topic: Plants Biological Life Cycle
Replies: 4
Views: 3122

Hi JJ, I don't think I'm asking for someone build my models... This is not a forum for commercial relationships I guess... I just couldn't find any similar models to look at... specially because the issues regarding published models quality (discussed already in somewhere...). Also, I think that if ...
by geamaro
Thu Oct 30, 2008 1:41 pm
Forum: Vensim
Topic: Plants Biological Life Cycle
Replies: 4
Views: 3122

Plants Biological Life Cycle

I am looking for a way to model plants biological life cycle. The time is not fixed for each stage and we have, at least 4 stages: seedlings (1 year old), young not productive (4 years old), productive young (6 years old), productive mature plants (10 years old), senile plants (30 years old or more)...
by geamaro
Wed Oct 29, 2008 2:02 pm
Forum: Vensim
Topic: cohort with SHIFT IF TRUE
Replies: 5
Views: 3551

Thank you Bob for your help!
G
by geamaro
Tue Oct 28, 2008 5:05 pm
Forum: Vensim
Topic: cohort with SHIFT IF TRUE
Replies: 5
Views: 3551

cohort with SHIFT IF TRUE

Does anybody have a model that uses cohort with SHIFT IF TRUE to be used as an example? TIA.