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====== Tutorial 3 - Creating vector and matrix parameters ======

===== 3/4 =====

**Creating materials**

Like in [[Tutorial_2-Creating_a_compartment_model|Tutorial 2-Creating a compartment model]], we will use [[Material|Material]]s to model the contaminants. Open the [[Materials_window|Materials window]] and create the following [[Material|Material]]s:

^Name^Full name      ^Symbol        ^
|NO  |Nitrogen Oxide |NO            |
|SO_2|Sulphur Dioxide|SO<sub>2</sub>|

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**Changing parameter dimensions**

If you open the [[Index_lists_window|Index lists window]] you will see a list of all available index lists. The index lists are expanded by clicking the ”+” symbol. As you see there are indices for all transfers, compartments and materials.

{{:tutorial_3_3_1.png|Screenshot}}

These index lists can be used to create [[Parameter|Parameter]]s that are material, compartment or transfer dependent. This makes it, for example, possible for you to create //one// parameter which is used in many different [[Transfer|Transfer]]s. Depending on in which object it is used, Ecolego will use a corresponding value found in the parameter.

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**Creating input**

The //input// parameter is a simple material-dependent vector.

<HTML><ol></HTML>
<HTML><li></HTML><HTML><p></HTML>Open the [[Blocks_window|Blocks window]] if it is not already open.<HTML></p></HTML><HTML></li></HTML>
<HTML><li></HTML><HTML><p></HTML>Right-click the //input// parameter, and choose **Edit** from the pop-up menu.<HTML></p></HTML><HTML></li></HTML>
<HTML><li></HTML><HTML><p></HTML>Select the **Values** tab. Change dimension to “1 dependency”.<HTML></p></HTML><HTML></li></HTML>
<HTML><li></HTML><HTML><p></HTML>Set the drop-down list that appears to “Materials”.<HTML></p></HTML><HTML></li></HTML>
<HTML><li></HTML><HTML><p></HTML>Assign the following values:<HTML></p></HTML>
^Materials^Value^
|NO       |10   |
|SO2      |20   |
<HTML></li></HTML>
<HTML><li></HTML><HTML><p></HTML>Close the window by clicking **Ok**<HTML></p></HTML><HTML></li></HTML><HTML></ol></HTML>

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**Creating ic**

The //ic// [[Parameter|Parameter]] is used as the initial condition for both [[Compartment|Compartment]]s. It is a matrix parameter with different values for different compartments and different materials.

<HTML><ol></HTML>
<HTML><li></HTML><HTML><p></HTML>Right-click the //ic// parameter, and choose **Edit** from the pop-up menu.<HTML></p></HTML><HTML></li></HTML>
<HTML><li></HTML><HTML><p></HTML>Select the **Values** tab. Change dimension to “2 dependencies”.<HTML></p></HTML><HTML></li></HTML>
<HTML><li></HTML><HTML><p></HTML>Set the first dependency to to “Materials”.<HTML></p></HTML><HTML></li></HTML>
<HTML><li></HTML><HTML><p></HTML>Set the second dependency to “Compartments”.<HTML></p></HTML><HTML></li></HTML>
<HTML><li></HTML><HTML><p></HTML>Assign the following values:<HTML></p></HTML>
^Materials^Compartment^Value^
|NO       |Upper_Soil |1000 |
|SO2      |Upper_Soil |1000 |
|NO       |Lower_Soil |10   |
|SO2      |Lower_Soil |100  |
<HTML></li></HTML>
<HTML><li></HTML><HTML><p></HTML>Close the window by clicking **Ok**<HTML></p></HTML><HTML></li></HTML><HTML></ol></HTML>

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**Creating a sub-set index list for TC**

The //Transfers// [[Index_list|Index list]] has one index for each [[Transfer|Transfer]] in the model. It thus have the following indices:

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|Deposition    |
|Upper_to_Lower|
|Lower_to_Sink |

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The parameter //TC// is only used for the two [[Transfer|Transfer]]s //Upper_to_Lower// and //Lower_to_Sink//. If we assign the //Transfers// index list to //TC//, we would have to put a “dummy”-value for //Deposition//, as the parameter is not used there. Instead we can create a sub-set of the //Transfers// [[Index_list|Index list]] which does not include //Deposition//, and use it for //TC//.

<HTML><ol></HTML>
<HTML><li></HTML><HTML><p></HTML>Open the [[Index_lists_window|Index lists window]]<HTML></p></HTML><HTML></li></HTML>
<HTML><li></HTML><HTML><p></HTML>Right-click the //Transfers// [[index_list|index list]] and choose **New | Sub-set** from the pop-up menu.<HTML></p></HTML><HTML></li></HTML>
<HTML><li></HTML><HTML><p></HTML>A new [[Index_list|Index list]] is added to the list named “Transfers_Sub_Set”. Right-click it and select **Edit** from the pop-up menu.<HTML></p></HTML><HTML></li></HTML>
<HTML><li></HTML><HTML><p></HTML>Select the **Properties** tab and change the name to “Soil fluxes”.<HTML></p></HTML><HTML></li></HTML>
<HTML><li></HTML><HTML><p></HTML>Select the **Values** tab. Unselect the “Deposition” index.<HTML></p></HTML><HTML></li></HTML>
<HTML><li></HTML><HTML><p></HTML>Close the window by pressing **Ok**<HTML></p></HTML><HTML></li></HTML>
<HTML><li></HTML><HTML><p></HTML>Open the [[Blocks_window|Blocks window]].<HTML></p></HTML><HTML></li></HTML>
<HTML><li></HTML><HTML><p></HTML>Right-click the //TC// parameter, and choose **Edit** from the pop-up menu.<HTML></p></HTML><HTML></li></HTML>
<HTML><li></HTML><HTML><p></HTML>Select the **Values** tab. Change dimension to “2 dependencies”.<HTML></p></HTML><HTML></li></HTML>
<HTML><li></HTML><HTML><p></HTML>Set the first dependency to “Materials”.<HTML></p></HTML><HTML></li></HTML>
<HTML><li></HTML><HTML><p></HTML>Set the second dependency to “Soil fluxes”.<HTML></p></HTML><HTML></li></HTML>
<HTML><li></HTML><HTML><p></HTML>Assign the following values:<HTML></p></HTML>
^Materials^Soil fluxes   ^Value^
|NO       |Upper_to_Lower|0.005|
|SO2      |Upper_to_Lower|0.03 |
|NO       |Lower_to_Sink |0.13 |
|SO2      |Lower_to_Sink |0.07 |
<HTML></li></HTML>
<HTML><li></HTML><HTML><p></HTML>Close the window by clicking **Ok**<HTML></p></HTML><HTML></li></HTML><HTML></ol></HTML>

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**Next**

  * [[Tutorial_3-Running_a_simulation|Running a simulation (4/4)]]

**Previous**

  * [[Tutorial_3-Creating_the_model_objects|Creating the model (2/4)]]

**References**

  * [[Tutorials|Back to Tutorials]]
  * [[start|Home]]
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