====== Tutorial 2 - Assigning material dependent values ======



===== 5/7 =====

This lesson will teach you how to vectorize parameters, of [[Index_list|Index list]]s and how to assign index-specific data.

The two [[Parameter|parameters]] of the [[Model|model]] control the uptake rate and the excretion rate of the fish. These coefficients are typically substance dependent.
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**Converting a parameter to a vector**

  - Open the [[Blocks_window|Blocks window]] by selecting **Window | Blocks** from the [[Menu_bar|menu bar]].
  - Right-click the //k_uptake// parameter and select **Edit** from the pop-up menu.
  - Select the **Values** tab.
  - From the **Dimension** drop-down list, select “1 dependency”. Make sure that “Materials” is selected in the drop-down list that appears.
  - As you see, the table now has a row for each [[Material|material]]. The top row can be used for default values. If no value is specified for a material, the default value is used.
  - Assign the following values to the //k_uptake// parameter:

^Material^Value^
|Arsenic |0.1  |
|Lead    |0.013|
|Mercury |0.19 |

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**Assigning values to k_excretion**

Follow the same procedure as above, and assign the following values to //k_excretion//:

^Material^Value^
|Arsenic |0.05 |
|Lead    |0.003|
|Mercury |0.01 |

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**Assigning initial conditions**

Ecolego will automatically convert all [[Compartment|compartments]] to vectors when [[Material|materials]] are added to the model.

  - In the [[Interaction_matrix|Interaction matrix]] of the [[Matrix_window|Matrix window]], edit the first [[Compartment|compartment]].
  - Select the **Values** tab. As the [[Compartment|compartment]] is a vector, you must now assign initial inventories of all [[Material|material]]:

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^Material^Value^
|Arsenic |10000|
|Lead    |10   |
|Mercury |1000 |

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**Next**

  * [[Tutorial_2-Running_a_simulation|Running a simulation (6/7)]]

**Previous**

  * [[Tutorial_2-Vectorizing_the_model|Vectorising the model (4/7)]]

**References**

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