If Then Else condition

[Karthik]

Hello,

I have created the attached model on Vensim PLE.My aim is to optimise the transport costs by altering the weight and volume of the shipment.
Here are my queries :
1.Can two different variables with different units be used with a If Then Else statement.(Ex: in Volumetic weight).When I run the simulation,the graph is a constant for volumetric weight(parallel to x axis).
2.Is Shipment = Volume * weight? or some other relation?
Since this is my first attempt at creating a model,please provide me with your suggestions for the equations behind the variables as well and model structure.

Thanks,

[Administrator]

1.Can two different variables with different units be used with a If Then Else statement.(Ex: in Volumetic weight).

You can do something like "IF (time > 10 , x , y)", x and y must be the same units. But the "time > 0" can be different. The equation for "Volumetic weight" in your model is a little strange, what are you trying to do here?

2.Is Shipment = Volume * weight? or some other relation?

It should be measured in "articles/month". I don't understand what you are trying to work out in the model so cannot comment any further.

[Karthik]

the thing is if volume of the shipment is greater than 1 cubic metre ,then weight of shipment(kg) is multiplied by 200 and then the freight net is charged for this new weight(kg),if the volume is less than 1 cubic metre,the freight net is charged for the actual weight(kg) of the shipment

[Karthik]

shipment are the articles sent in cartons which have a weight and volume and transported in pallets,how can this be interpreted in the model?Please help

[Administrator]

Why don't you start with the "articles". Each one must have a weight, so multiply the number of articles to be shipped by the weight, this will give you the shipping cost.