Ralf Dyllick 10/28/2010

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Dear LEAP - Team,

I've been working with the exercises posted on the COMMEND website and I find them very helpful: The instructions are clear and the training provides a great deal of insight into the mechanics of LEAP and the program's capabilities and its potential.

While working with the exercises, I realized that LEAP seems to not correctly (or reasonably) process the scale of the parameters listed in the key assumptions. The situation I encountered in exercise 2 is as follows: The population value in the key assumptions is 40, the scale is set at "million". When I reference to this assumption in another module and multiply it with another number (in order to compute the yearly freight in tone-km), LEAP treats population as "40" as opposed to "40mio". When I replace the population figures with "40 000 000" and set the scale of the same assumption to " ", the result is correctly scaled.

Looking forward to your guidance.

Best regards
Ralf Dyllick

Tory Clark 10/28/2010
 

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Hi Ralf,

Thank you for your kind words about the LEAP training materials.

It sounds to me like you need to set the proper scale in the module where you are referencing the key assumption as well as in key assumptions. I'm assuming that the specific discrepancy you are seeing is from exercise 2.2.1 where you are asked to enter total population as an activity level.

This would mean going to this branch: Demand/Transport, and then the variable "Activity Level" and setting the expression to:

key\population

If you do this, the expression will automatically populate the expression with appropriate units, in this case it should say:

key\population[million people]

These bracketed units are for the users benefit and are not actually used in LEAP calculations. Therefore you need to also set the scale to be "Million". This should fix the discrepancy in units that you are seeing.

Let me know if you have any other questions.

Tory