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parameter_optimization [2019/11/18 13:34]
127.0.0.1 external edit
parameter_optimization [2022/06/09 10:23]
mina [Optimization settings]
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 The parameter optimization window is divided into several pages in a wizard style. The **Back** and **Next** buttons will guide you back and forth in the wizard. The parameter optimization window is divided into several pages in a wizard style. The **Back** and **Next** buttons will guide you back and forth in the wizard.
  
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 ===== Selecting optimization parameters ===== ===== Selecting optimization parameters =====
  
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 For each selected parameter one has to give an initial condition, this is the starting guess in the optimization algorithm. One also has the possibility to add constraints on upper and lower bounds for each selected parameter. Default values are infinity and negative infinity respectively on these bounds, therefore there won’t be any bounds. For each selected parameter one has to give an initial condition, this is the starting guess in the optimization algorithm. One also has the possibility to add constraints on upper and lower bounds for each selected parameter. Default values are infinity and negative infinity respectively on these bounds, therefore there won’t be any bounds.
  
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 ===== Selecting output targets ===== ===== Selecting output targets =====
  
 In the second page of the optimization wizard one has to choose which output targets one wants to optimize the parameters against. An optimization target is the value for a specific output at a specific time-point. The list displays all available outputs. Select an output and click the **Add** button to add it to the table of output targets. In the table you must specify the target value for the output as well as at which time-point this target should have the value. In the second page of the optimization wizard one has to choose which output targets one wants to optimize the parameters against. An optimization target is the value for a specific output at a specific time-point. The list displays all available outputs. Select an output and click the **Add** button to add it to the table of output targets. In the table you must specify the target value for the output as well as at which time-point this target should have the value.
  
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 ===== Optimization settings ===== ===== Optimization settings =====
  
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   * **Maximum number of function evaluations allowed** - //default: 200 times number of parameters//   * **Maximum number of function evaluations allowed** - //default: 200 times number of parameters//
   * **Maximum number of iterations allowed** //default: 200 times number of parameters//   * **Maximum number of iterations allowed** //default: 200 times number of parameters//
-  * **Objective function which we want to minimize** (not editable)+  * **Objective function which we want to minimize** (not editable) - It is used for evaluating the goodness of fit of the optimization – the lower the value of this function, the better is the fit. It is calculated for each iteration and iterations are continued if the objective function is getting lower values, until the termination tolerance is reached or the user-specified maximum number of simulations is reached
  
 [1] Lagarias, J.C., J. A. Reeds, M. H. Wright, and P. E. Wright, "Convergence Properties of the Nelder-Mead Simplex Method in Low Dimensions," _SIAM Journal of Optimization_, Vol. 9 Number 1, pp. 112-147, 1998. [1] Lagarias, J.C., J. A. Reeds, M. H. Wright, and P. E. Wright, "Convergence Properties of the Nelder-Mead Simplex Method in Low Dimensions," _SIAM Journal of Optimization_, Vol. 9 Number 1, pp. 112-147, 1998.
 To start the optimization click the **Optimize** button. To start the optimization click the **Optimize** button.
  
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 ===== Optimization results ===== ===== Optimization results =====
  
parameter_optimization.txt · Last modified: 2022/12/29 17:47 by mina