Ventana software support forum

Please ignore - I set the wrong ptype, which was the issue.

Hello, I have been testing using FIND MARKET PRICE and SUPPLY AT PRICE to estimate electricity dispatch, assuming normal distributions for different power plant dispatch costs. I was doing some validation of the results and found that the results from Vensim are erroneous. You can validate this agai...

I am having the same exact thing happen all of a sudden out of nowhere.

We do have batteries and pumped hydro, but they are not part of this solution, we handle them separately because of intertemporal issues, as you suggest. We use the prior year outputs on market revenue to allocate when they are charged (batteries) and discharged (both), and modify the load (both) in...

Hi there,

I thought I'd circle back on this to see if you ever looked into it? A FIND MIN function would still be extremely helpful.

Thanks that is helpful. We have an instance or two of that in the part of the codes that is heavily subscripted, and will edit accordingly.

Ultimately, we ended up just reducing the number of elements in a few of the main subscript ranges, which dramatically lowered the run time.

Thanks @Tom. One other question for you. We have started using LOOKUP INVERT in some variables that have high dimensionality. Do you know if this is an expensive function? If not we can replace it with some math instead based on the input table we are using. I'm looking into the output approach you ...

Yes, I haven't changed anything for those files.

Given the issues I was having I just went back and replicated my work off an earlier model and have moved forward with that. At this point, I'm fine to close this issue, given I've moved on.

We are building out some complicated new code and have noticed significant runtime slowdown (not surprising). We are wondering if there is any existing software or capability to audit the equations in a .mdl file and identify which are using the most memory/processing, in order to try and reduce the...

Sadly, I don't. The backup version is what I sent. The prior editing was nothing complicated... Just a few formula tweaks.

I am not sure how/why the .mdl got corrupted, but the uploaded file reliably crashes every time I attempt to save it on Vensim DSS 8.2.4. It was working fine until a recent round of edits. It opens as text, which is strange. But I can view it as a sketch. I attempted to copy and paste the text into ...

I think you're right. I've been trying to replicate it but this is I think the effect. Thanks for the clarification

Bug report for DSS 9.3.5 When editing a constant by clicking on the slider bar and entering values in SyntheSim mode, once values are entered, clicking "Return" or "Enter" on the keyboard does not accept the changes and close the box. It just returns an audio warning. This is a r...

Bug report for DSS 9.3.5

Click on the move tool seems to pretty reliably cause the screen to jump to a new a spot on the view.

Bug report for DSS on 9.3.5

Changing the variable name in the equation editor window doesn't necessarily carry through to the variable name in the sketch. Also, it is producing an error that usually comes up when different equations within a variable have different variable names.

DSS 9.3.5

Bug report for the new GUI. When creating an equation and drawing an arrow from a shadow variable to the new variable, Vensim is not deleting or prompting to delete the existing connection, so I have two sets of arrows from the same variable (one the model variable and one the shadow variable) to th...

I will switch back to the new GUI and log bugs going forward instead of staying on the old GUI. It's been a few months since I switched back so I don't recall exactly.

Yes, we've been using the old GUI after running into some issues with the new one.

Hello, My colleagues and I have recently been running into a "Stop from Vensim" warning on application open in which Vensim states it is unable to open the vensimdp.ini file for read/record initialization information. This appears to be happening on DSS 9.3.5. When this warning appears, Ve...

I've been playing around with this a bit, starting from the FIND ZERO example and trying to build something for electricity capacity. However, this has proven to be very tough. I tried developing a formula that would get closer to zero with a growing difference in future system costs with additions ...

For what it's worth after some very brief testing, this is still causing merge conflicts when we try to merge separately edited model versions together. I'm not sure if it is a Git configuration setting or something else. The general issue is that when the same line number is edited in two .mdl file...

Aha! I have been using the old GUI, which doesn't have these options when I go to Model>Settings. I am gathering might be the issue here since these options aren't available.

I can test more tomorrow using the new GUI and settings above.

Thanks for this. Will have a look! By the way, Jeff and I are working on an 8760 dispatch model within an annual timestep model within the EPS that you might find interesting and we hope to have soon. We mapped hours onto a subscript and the model solves using ALLOCATE AVAILABLE for each hour. We ba...

Hello, Moving a prior thread to its own thread here: has there been progress made on using DSS with source management tools, like Github. Previously, when attempting to do merges and other actions, the coordinate system in Vensim would get messed up and cause the model to visually fail. Travis Franc...