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Find the Studies subsection. In the Select Study tree, select Preset Studies for Selected Physics Interfaces>Stationary.
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Locate the Definition section. In the Expression text field, type sin(x1)+a*(sin(x2))^2+b*x3^4*sin(x1).
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In the Model Builder window, right-click Study 1 and choose Uncertainty Quantification>Uncertainty Quantification.
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Click Add.
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Locate the Input Parameters section. Find the Input parameters table subsection. Click Add three times.
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In the Settings window for Uncertainty Quantification, locate the Uncertainty Quantification Settings section.
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Right-click Study 2>Uncertainty Quantification and choose Add New Uncertainty Quantification Study For>Uncertainty Propagation.
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In the Settings window for Uncertainty Quantification, locate the Uncertainty Quantification Settings section.
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Find the Surrogate model settings subsection. From the Surrogate model list, choose Adaptive sparse polynomial chaos expansion.
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