Ventana software support forum

Hi there, I'm having an issue trying to build a model with multiple ranges of subscripts. I have a variable, call it "variable" which has two subscript ranges, "A" and "B" attached to it, such that: "variable"[A,B] Within the two subscript ranges are a number ...

Hi there

The last couple of times I have tried to close down a model, I get an error message that says

"Unable to copy file ...mdl to ...2mdl

File not saved"

Does anyone know what might be causing this?

Cheers

Mik

Hi Bob (all) That's still not working. I thought it might be as I am using a combined line and dot plot (of two different variables on the same plot) but I have tried it wit just one variable and it still doesn't work. I've tried a number of iterations (different permutations) of this and I can't ch...

Cheers Bob, I'll try that.

It would be good to have the update as I did try and change the dots size via the line width initially.

Would that change include graphs made in the custom graph editor (as opposed to the text editor)?

Cheers

Mik

Thanks Tom and Bob

I was asking about the objective function - I couldn't think of the right term.

Cheers

Mik

Hi all

I have a (hopefully) quick question.

What optimisation method does VenSim use, i.e. what is the value that is being optimised, e.g. residual sum of squares, etc.

I couldn't seem to find it in the manuals

Cheers

Mik

Hi again

I'm trying the :SHAPE command, but it doesn't seem to be working.

I am writing:

:DOTS
:SHAPE cross, 10

The shape doesn't change from the default square shape. Any idea what might be wrong?

Mik

[Edited on 2-16-2010 by mikdale]

Thanks Bob

Hi all

Is it possible to change the size of dots used in a custom graph?

Cheers

Mik

That worked.

Thank you, mysterious stranger...


...whoever you are!?!

Maybe, I'll give it a go

Many thanks

Mik

Hi all I am trying to find a way to get the value of a variable, say x, from a specific timestep, t = 10, and input that into the equation for another variable, say y such that y = F(x(t=10)) I've thought of an inelegant way to do it by using a delay function and increasing the value of the delay ti...

Hi all

I think I sussed it. I was on 'univariate' which meant that the model value was being used.

Cheers

Mik;)

[Edited on 1-25-2010 by mikdale]

Hi guys I have an issue with sensitivity testing. The results I obtain from my Monte Carlo simulations are sensitive to the value of constants (those being varied by the sensitivity test) in the model itself. Just in case that doesn't make sense. I am testing my model output over some set of constan...

Thanks for that.

Is there any way to change the color of the sensitivity line traces?

Cheers

Mik

Hi All I'm plotting some custom graphs of sensitivity runs and I'm having issues with plotting the mean line in a specified color - not too sure what the correct command should be. The command says :MEAN color will plot the mean in the specified color, but if I try writing the name of a color, i.e. ...

Does anyone know of a means to get the values of the mean of a sensitivity run?

I am able to plot it, but would like the actual numerical values too.

Any help much appreciated

Mik:)

Hi again

Don't worry, it seems to be sorted now, not sure what was going on though - bit weird

Cheers

Mik

Hi all I'm having a bit of a strange problem. I have run some sensitivity testing on my model using normal distributions, got it all running very well. I have since come back and changed a couple of the variable distributions and the sensitivity confidence bounds are now MUCH larger than before. 'Th...

Hi Bob Thanks for the reply. The equations you suggest deal with the value of each of the supplies but I'm not sure how to assign those values based on which energy source has the highest payback value. Does that make sense? So, sometimes let's say oil has the highest energy return so is assigned pr...

Hi all I have run into a bit of difficulty (again!) I'm trying to model the global energy system. I have a set pattern for demand (following a logistic growth up to some limit). This demand is then met by the various supply technologies, assigning priority based on values of energy return up to the ...

Hi there

I've managed to create a level that matches the value of the flow.

Thanks

Mik

Hi there I have re-jigged my model to include a level (see attached), so that the value of the level is INTEG((f(t) - f(t-1))/dt), but now I need to feed the value of 'annual renewable extraction' from the previous timestep to the rate leaving the level. I can't seem to find any means by which to do...

Hi Bob and JJ Thanks for the help. I have thought having the EROI change as a function of the Renewable Capital Stock normalized to the maximum capital stock needed to achieve the full potential extraction, but unfortunately that is exactly what I don't know and partly what I am trying to find out b...

Hi Bob

Thanks for the quick response.

The model that you sent works for depletable resources (non-renewable) and that works fine in my model, but I am also trying to model renewable resources too, where I don't have a level.

I've attached my full model. Any suggestions in this case?

Mik