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Tutorial - Time events - Monthly maximum
A common request is to find the maximum value of an output. For this one can use the 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 block which records the soil concentration.
Create time point
1. Create a time point block 2. In the values screen, click the **Settings** button. Change the **Mode** to **Day of month**. 3. Enter the value 1 as the **Timepoint** in the table 4. Close the window
This tutorial gives some examples of how to model events that occur at specific time points in a simulation.
Base model
All examples are based on the following base model, which calculates a dummy value we can use for our event experiments. You can download the model from here
1. Edit simulation settings. Set
- Time unit: Days
- Time mode: Time
- Start time: 0.0
- End time: 100.0
- Start date:2000-01-01
- Output options: Produce additional output
- Time points: from start to end with a 1.0 increment
2. Create a material named Poison with the unit mg.
3. Create two compartments Sky and Soil. Set the initial condition for Sky to be 500 (mg) of Poison.
4. Add a transfer from Sky to Soil and set its equation to “30+sin(time/5)*20+cos(time/3+2)*10”
5. Add a transfer from Soil to Sky and set its equation to “30+sin(time/3+2)*10+cos(time/7+3)*20”
6. When run, the model will output a Sky and Soil concentration like this:
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See also
