Ventana software support forum

Hi,

I'm a new user of Vensim. I'm trying to create a model that should simulate a year on a hour by hour basis.

I have tried to create some lookup variable with 8760 time step. Every time I do this, I get this error message:

"Memory allocation failure - subblock"

Then a message with "aborting Vensim" appears and the program close down.

Why is this? I have tried to create lookups with only 4000 steps and this doesn’t appear to be a problem. Isn’t Vensim able to handle more than this?

If you could tell me how to overcome this problem I would really appreciate it.

Best regards,

Skjold from DK

There is a limit to the number of pairs in a Lookup - and a Lookup is a avery ineffecient means for storing a large number of points. If you simply have data, then use a Data variable for this.

Hi Skjold

If you have Vensim pro you can try something like the model joined.
Regards.
JJ

Thank you for your helpfuld answers. The use of data variables did the trick.

Best regards

Skjold