=====Tutorial - Time events - Monthly maximum =====

A common request is to find the maximum value of an output. For this one can use the [[minmax|Min/Max]] block. However, in this experiment we will determine the maximum for each month of the simulation.

This means that we need to reset the Min/Max block every month. We will need the following:

  * A [[Time point]] block which allows us to specify the first day of each month
  * A [[Time event]] which will fire events based on the time point block
  * A [[min max|Min/Max]] block which records the soil concentration.

**Create time point**
  - Create a [[time point]] block 
  - Edit the block. 
  - In the **Properties** screen 
    - change the name to "Month_time_point". 
  - In the **Values** screen 
    - Ensure that the **Dimension** is **Scalar**
    - Click the **Settings** button. 
    - Change the **Mode** to **Day of month**.
    - Enter the value 1 as the **Timepoint** in the table, which indicates the 1st of each month.
  - Close the window
   
**Create event**
  - Create a [[time event]] block
  - Edit the block.
  - In the **Properties** screen 
    - change the name to "Month_event".
  - In the **Values** screen 
    - Ensure that the **Dimension** is **Scalar**
    - select **Month_time_point** and click the **>** button.
  - Close the window

**Create min/max**
  - Create a [[min/max]] block
  - Edit the block
  - In the **Properties** screen, change the name to **Monthly_max**
  - In the **Values** screen 
    - Enter the name _Soil_ in the **Target expression** column
    - Select _Month_event_ in the **Reset** column
  - Close the window

**Run a simulation**
  - Run a simulation, then plot **Soil** together with **Monthly max**. 
  - The plot should look like this:

{{ :time_event_tutorial_monthly_max_plot.png?700 |}}

You can download the solution {{ :monthly_max_model.eco |here}} 

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===== See also =====

  * [[tutorial - time events|First page]]
  * [[tutorials|Tutorials]]