In this lesson an expression is created which calculates the contaminant concentration in different plants, and also the two parameters CF and RootFactor.

Creating CF

1. Open the Blocks window.

2. Select Parameter from the Type drop down list and click the button on the title bar, or right-click the window and select Create | Parameter from the pop-up menu.

3. Edit the new parameter. In the Properties tab, give it the following properties:

   Name	Full Name
   CF	Concentration Factor

4. Select the Values tab. Change dimension from “Scalar” to “Matrix”.

5. Set Index-1 to “Materials”. Set Index-2 to “Plants”.

6. Assign the following values to the parameter:

   
   

   Materials	Plants	Value
   NO	Pine	0.003
   SO2	Pine	0.12
   NO	Fir	0.21
   SO2	Fir	0.013
   NO	Wheat	0.06
   SO2	Wheat	0.013
   NO	Oats	0.093
   SO2	Oats	0.013

   
   

7. Click Ok to close the window.

Creating RootFactor

1. Select Parameter from the Type drop down list and click the button on the title bar, or right-click the window and select Create | Parameter from the pop-up menu.

2. Edit the new parameter. In the Properties tab, give it the following properties:

   
   

   Name	Full Name
   RootFactor	Root penetration factor

   
   

3. Select the Values tab. Change dimension from “Scalar” to “Vector”.

4. Set Index-1 to “Plant types”.

5. Assign the following values to the parameter:

   Plant types	Value
   Tree	0.6
   Grain	0.001

6. Click Ok to close the window.

Creating the expression

1. Open the Blocks window

2. Click the button on the title bar, or right-click the window and select Create | Expression from the pop-up menu.

3. Right-click the new expression and select Edit from the pop-up menu.

4. In the Properties tab, give the expression the following properties:

   
   

   Name	Full Name	Symbol
   Plant	Concentration in plant	APlant

   
   

5. Select the Values tab. Change dimension from “Scalar” to “Matrix”. Set Index-1 to “Materials” and Index-2 to “Plants”.

6. In the Default row, enter the expression “CF * ( Upper_Soil + Lower_Soil * RootFactor )”

7. Click Ok to close the window.

Next

• Index operators (4/5)

Previous

• Creating a custom index list (2/5)

References

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