Ventana software support forum

Hello,
I am new to Vensim and try to run Vensim 5.11A from a Windows7 command line:
Content of treez.cmd (Please allow to attach *.cmd files and *.dat files to the ticket):
The command file treez.cms should:

* load my model treez.mdl,
* set the value of a variable "CarFlow" to 4
* run the simulation
* write the calculated values of CarStock to result file treez.dat

However, the variable CarFlow does not seem to change.
It's value is always 1 as defined in the original treez.mdl file.
Therefore, the last calculated value of CarStock is 100 instead of 400.

=>How do I have to adapt my model or command file to correctly set the variable value?

Do I have to use a different type of variable? Do I need to execute an additional command?

The files treez.mdl, treez.vdf and treez.lst are attached.


I also tried to only use the first three lines of the command file...
... I would expect that I can see a value of 4 for the CarFlow Variable
in the Vensim User Interface but it is 1.

Do you actually run the model as well? Your CMD file does not show a line such as
MENU>RUN|o

Maybe I don't understand your question. The run command is on line 4 of the first cmd file example. My second example does not include the run command on purpose.

Since I can not edit the orginal post (?!)... here is a screenshot of the treez model as comment:
download/file.php?id=2845

There is no cmd file, what happens if you run

Ahh, sorry, I misread your original post.

Try this,
My guess is that the default run name is "current.vdf", so running VDF2DAT on treez.vdf will not give the changes.

Running the whole command file works now. The last written value in the treez.dat file is 400.
Thanks a lot!

Is it also possible to reflect the change of the variable values in the GUI, so I can
manually check the values?

If I remove the exit line, I would expect to be able to inspect the altered equations but
the GUI seems to always show the original ones.

SIMULATE>SETVAL will only override the value in the model (it will not change it permanently).

Best practice would be to set it to zero in the model, and use a CIN file to hold your constants.

neither reflects the changes in the GUI. Nevertheless, it is good to know about the
cin option to write several variable values in a file and separate them from the rest
of the command file. Thanks again.

It will never change the model itself (what you see in the GUI).

Best practice is to keep model and data/constants separate.

If you really want to ensure separation, you can set the model value to :NA: - that way the model will generate errors or na values if the .cin file does not populate the constant.

I usually have a usable default value in the equation, and use .cin files for experiments or scenarios.