If you encounter a problem with many variables (more than 4) as free parameters:
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The gradient behaves better with squares or quadratic functions (especially relevant for "Target Values"). Hence the following problem:
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In most cases the properties of the functions used inside the optimization problem are unknown. In this case, it is recommended to use the global search algorithm (Simulated Annealing). However, as this algorithm can take a long time to reach convergence (especially when there are many free parameters), it could be helpful to use a local search (gradient) for a few iterations before switching to the global search (Simulated Annealing). Eventually, when the global search has converged and that results must be refined, reduce the ranges around the found solution and restart a slow Local Search.
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Always use well-constrained sketches when they are involved in an optimization. Under-constrained sketches can lead to wrong solutions or collapsed geometries (see KwoCirclesSk.CATPart). It is also recommended to limit the ranges of the free parameters to reasonable values.
The process described below is based on the following file: HowToManuallyBuildGraphsFromDoEExcelOutputFile.xls
For each effect graph to build, i.e. for each array of the part entitled ARRAYS OF FACTORS EFFECTS, for each output S and each factor X, perform the following actions in the Excel file:
If not already done, open the DoE output Excel file.
Click the Chart Wizard command.
Select the Line as Chart type and click the NEXT command.
In the Data Range tab:
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In the Data Range tab :
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In the Titles tab:
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Leave the other tabs unchanged and click NEXT.
Choose the As Object in : Sheet1 option.
Click FINISH.
For each interaction graph to build, i.e. for each array of the part entitled ARRAYS OF INTERACTIONS AVERAGES, perform the following actions in the Excel file :
If not already done, open the DoE output Excel file.
Click the Chart Wizard command.
Select the Line as Chart type and click NEXT.
In the Data Range tab:
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In the Series tab :
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In the Titles tab :
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(Y) axis = Average of OutputN (output's unit) |
Do not modify the other tabs and click NEXT.
Choose the As Object in : Sheet1 option.
Click FINISH.
For each slope graph to build, i.e. for each array of the part entitled ARRAYS OF EFFECTS SLOPES,perform the following actions in the Excel file :
If not already done, open the DoE output Excel file.
Click the Chart Wizard command.
Select the Line as Chart type and click NEXT.
In the Data Range tab:
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In the Series tab :
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In the Titles tab :
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Do not modify the other tabs and click NEXT.
Choose the As Object in : Sheet1 option.
Click FINISH.