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tutorial:varying_parameters_in_a_simulation [2013/07/23 21:09]
juliana
tutorial:varying_parameters_in_a_simulation [2020/02/18 23:06]
argemiro
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 ====== Varying parameters in a simulation ====== ====== Varying parameters in a simulation ======
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 Nothing should remain constant in a dynamic model. In this respect, Dinamica EGO enables to vary model parameters either in different simulation phases or at each time step.  In the Stack tab, a set of Select Functors can be used to change the values of input parameters according to the model step. Nothing should remain constant in a dynamic model. In this respect, Dinamica EGO enables to vary model parameters either in different simulation phases or at each time step.  In the Stack tab, a set of Select Functors can be used to change the values of input parameters according to the model step.
  
 **Using different transition matrices** ​ **Using different transition matrices** ​
  
-For examples, instead of using only a constant transition matrix, [[:select_transition_matrix|Select Transition Matrix]] enables the use of different transition matrices in a simulation.+For examples, instead of using only a constant transition matrix, ​//[[:Select Transition Matrix]]// enables the use of different transition matrices in a simulation.
  
-To start, load the model simulate_deforestation_using_multiple_transition_matrix.xml” ​from \ advanced\multiple_parameters\simulate_deforestation_using_multiple_transition_matrix+To start, load the model ''​simulate_deforestation_using_multiple_transition_matrix.egoml'' ​from ''​\Guidebook_Dinamica_5\Models\additional_resources_lucc\multiple_parameters\simulate_deforestation_using_multiple_transition_matrix''​
  
 {{ :​tutorial:​advanced_1.jpg |}} {{ :​tutorial:​advanced_1.jpg |}}
  
-Using more than one transition matrix in a model is quite simple. In this version of a deforestation model, //Select Transition Matrix// was added to allow the choice of a transition matrix according to the model step. Each transition matrix is entered in a [[:number_transition_matrix|Number Transition Matrix]], click on this functor with the Edit Functor. ​+Using more than one transition matrix in a model is quite simple. In this version of a deforestation model, //[[:Select Transition Matrix]]// was added to allow the choice of a transition matrix according to the model step. Each transition matrix is entered in a //[[:Number Transition Matrix]]//, click on this functor with the Edit Functor. ​
  
 {{:​tutorial:​advanced_2.jpg |}} {{:​tutorial:​advanced_2.jpg |}}
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-**Matrix Number** in this functor indentifies the model step in which this transition matrix begins to operate. The model will use this matrix until it finds a //Number Transition Matrix// with **Matrix Number** that corresponds to the current model step, while from this point onwards Select Transition Matrix switches to the new transition matrix. ​+**Matrix Number** in this functor indentifies the model step in which this transition matrix begins to operate. The model will use this matrix until it finds a //[[:Number Transition Matrix]]// with **Matrix Number** that corresponds to the current model step, while from this point onwards ​//[[:Select Transition Matrix]]// switches to the new transition matrix. ​
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 <WRAP column 30%> <WRAP column 30%>
-<note tip>​**TIP**:​ you can use as many transition matrices as time steps. ​ You just need to add more //Number Transition Matrix// functors and number them according to the model time intervals.</​note>​+<note tip>​**TIP**:​ you can use as many transition matrices as time steps. ​ You just need to add more //[[:Number Transition Matrix]]// functors and number them according to the model time intervals.</​note>​
 </​WRAP>​ </​WRAP>​
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 +**Using different Weights of Evidence coefficients** ​
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 +The same procedure applies to the selection of other model parameters, such as the Weight of Evidence ​
 +coefficients. ​
 +Load the model: ''​simulate_deforestation_using_multiple_transition_matrix_and_weights.egoml''​ from ''​\Guidebook_Dinamica_5\Models\additional_resources_lucc\multiple_parameters\simulate_deforestation_using_multiple_transition_matrix_and_weights''​
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 +A //[[:Select Weights]]// functor is added to the model to enable the selection of more than one Weights of Evidence coefficient files. A //[[:Number Weight]]// is inserted within the container //[[:Select Weights]]// for each Weights of Evidence coefficient file. Another //[[:Load Weights]]// is added to the model in the outside part of the main loop (//​[[:​Repeat]]//​). This functor loads the coefficients from a file and is connected to one of the //[[:Number Weights]]// inside the //[[:Select Weights]]//​. Open each one of the //[[:Number Weights]]// and edit the **Weight Number** field to define the step when each coefficient file begins to take part in the model.
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 +{{:​tutorial:​advanced_18.jpg |}}
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 +[[tutorial:​using_subregions_in_a_simulation_model|Next Lesson]]