====== Tutorial 2 - Creating transfers ======

===== 3/7 =====

In this lesson you will define the rate of transfer between the two [[Compartment|compartment]] blocks by connecting them with [[Transfer|transfers]].

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**Creating the uptake transfer**

Right-click the off-diagonal cell in the [[Interaction_matrix|Interaction matrix]] which is on the same //row// as the //Water// [[Compartment|Compartment]] and in the same //column// as the //Fish// [[Compartment|Compartment]]. Select **Transfer** from the pop-up menu.

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{{tutorial_compartment2.png}}\\

  - Double-click the [[Transfer|Transfer]], or right-click it and select **Edit** from the pop-up menu.
  - Make sure that the **Properties** tab is selected.\\
a) Enter “Uptake” in the **Name** field.\\
b) Enter “Uptake rate constant” in the **Full Name** field.
  - Select the **Values** tab. In the table, write “k_uptake” in the **Expression** column. When you press //Enter// and the “Unknown values” window appears, assign the unit “day^-1”. Click **Ok** (this results in the creation of the parameter //k_uptake//).
  - Close the edit window by clicking **Ok**.\\
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**Creating the excretion transfer**

  - Right-click the off-diagonal cell in the [[Interaction_matrix|Interaction matrix]] which is on the same //row// as the //Fish// [[Compartment|Compartment]] and in the same //column// as the //Water// [[Compartment|Compartment]]. Select **Transfer** from the pop-up menu.
  - Double-click the [[Transfer|Transfer]], or right-click it and select **Edit** from the pop-up menu.
  - Select the **Properties** tab.\\
a) Enter “Excretion” in the **Name** field.\\
b) Enter “Excretion rate constant” in the **Full Name** field.
  - Select the **Values** tab. In the table, write “k_excretion” in the **Expression** column. When you press //Enter// and the “Unknown values” window appears, assign the unit “day^-1”. Click **Ok**.
  - Close the edit window by clicking **Ok**.


{{tutorial_compartment3.png}}
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**Next**

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

**Previous**

  * [[Tutorial_2-Creating_compartments|Creating compartments (2/7)]]


**References**

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