# \#pck

**URL:** https://uqworld.org/tag/pck/67.md

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## [Custom Set A of PC-Kriging](https://uqworld.org/t/custom-set-a-of-pc-kriging/1610)

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**Author:** [@lqz](https://uqworld.org/u/lqz)\
**Replies:** 1\
**Last updated:** [June 10, 2022, 8:54am UTC](https://uqworld.org/t/custom-set-a-of-pc-kriging/1610 "2022-06-10T08:54:21Z")

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Hi, I know a suitable set of polynomial can be specified by MetaOpts.PolyType={} and MetaOpts.PolyIndices=\[\];. However, is there any way that we could specified the polynomial set which has been selected and confirmed …

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## [Surrogate-model based reliability](https://uqworld.org/t/surrogate-model-based-reliability/972)

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**Author:** [@Ziead\_Metwally](https://uqworld.org/u/Ziead_Metwally)\
**Replies:** 3\
**Last updated:** [April 20, 2022, 1:26am UTC](https://uqworld.org/t/surrogate-model-based-reliability/972 "2022-04-20T01:26:57Z")

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Hello everyone, I used PCK to build a surrogate model for an expensive finite element model. i need to conduct reliability analysis based on the developed surrogate model. I am having troubles defining the limit state f…

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## [Probability of failure \<(10-4) with AK-MCS and PCK metamodel](https://uqworld.org/t/probability-of-failure-10-4-with-ak-mcs-and-pck-metamodel/1348)

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**Author:** [@DorotC](https://uqworld.org/u/DorotC)\
**Replies:** 2\
**Last updated:** [October 21, 2021, 12:16pm UTC](https://uqworld.org/t/probability-of-failure-10-4-with-ak-mcs-and-pck-metamodel/1348 "2021-10-21T12:16:30Z")

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Hi everyone, I have some questions about the application of AK-MCS with PCK metamodel for calculating the probability of failure of a structural system. I am interested in the calculation of small probability of failur…

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## [Why the covariance matrix of outputs in PC-Kriging may not symmetric or positive definite](https://uqworld.org/t/why-the-covariance-matrix-of-outputs-in-pc-kriging-may-not-symmetric-or-positive-definite/1262)

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**Author:** [@libin](https://uqworld.org/u/libin)\
**Replies:** 0\
**Last updated:** [July 9, 2021, 6:15am UTC](https://uqworld.org/t/why-the-covariance-matrix-of-outputs-in-pc-kriging-may-not-symmetric-or-positive-definite/1262 "2021-07-09T06:15:55Z")

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I build a PC-Kriging and calculate the covariance matrix of outputs of Monte-Carlo samples using uq\_evalModel. But sometimes, the obtained covariance matrix may be not symmetric or positive definite. Why? How can I so…

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## [Meta-model based reliability](https://uqworld.org/t/meta-model-based-reliability/973)

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**Author:** [@Ziead\_Metwally](https://uqworld.org/u/Ziead_Metwally)\
**Replies:** 1\
**Last updated:** [December 17, 2020, 11:42am UTC](https://uqworld.org/t/meta-model-based-reliability/973 "2020-12-17T11:42:25Z")

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Hello everyone, I used PCK to build a surrogate model for an expensive finite element model. i need to conduct reliability analysis based on the developed surrogate model. I am having troubles defining the limit state f…

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## [Parallel computation applications of UQLab in MATLAB](https://uqworld.org/t/parallel-computation-applications-of-uqlab-in-matlab/856)

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**Author:** [@GPLai](https://uqworld.org/u/GPLai)\
**Replies:** 5\
**Last updated:** [September 28, 2020, 7:13pm UTC](https://uqworld.org/t/parallel-computation-applications-of-uqlab-in-matlab/856 "2020-09-28T19:13:55Z")

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Hi UQworld, I’m trying to sequentially update my metamodel, using UQLab, for instance the Kriging metamodel. And I want to use the parallel comptating capability of MATLAB, to accelerate the process. However, I found th…