# \#reliability **URL:** https://uqworld.org/tag/reliability/7.md [Latest](https://uqworld.org/latest.md) · [Categories](https://uqworld.org/categories.md) · [Tags](https://uqworld.org/tags.md) --- ## [Candidate sample update in UQLab ALR](https://uqworld.org/t/candidate-sample-update-in-uqlab-alr/9179)
**Author:** [@David\_Sebastian\_Calp](https://uqworld.org/u/David_Sebastian_Calp)\ **Replies:** 2\ **Last updated:** [July 29, 2026, 6:34pm UTC](https://uqworld.org/t/candidate-sample-update-in-uqlab-alr/9179 "2026-07-29T18:34:57Z")
Hello, I am using the Active Learning Reliability (ALR) framework in UQLab and would like to better understand how the candidate populations are handled internally during the enrichment process. My understanding is tha… --- ## [How to start performing Reliability analysis with UQLab using MATLA B](https://uqworld.org/t/how-to-start-performing-reliability-analysis-with-uqlab-using-matla-b/9131)
**Author:** [@Muazu](https://uqworld.org/u/Muazu)\ **Replies:** 0\ **Last updated:** [November 23, 2025, 6:29pm UTC](https://uqworld.org/t/how-to-start-performing-reliability-analysis-with-uqlab-using-matla-b/9131 "2025-11-23T18:29:52Z")
Dear All. I am highly excited to join this community. Please, I am conducting research that involves reliability analysis, and I am considering using UQLab with MATLAB for the analysis. I have connected UQLab with MATL… --- ## [Multiple Point Enrichment in ALR: learning function based stopping criterion](https://uqworld.org/t/multiple-point-enrichment-in-alr-learning-function-based-stopping-criterion/9102)
**Author:** [@colette.buchs](https://uqworld.org/u/colette.buchs)\ **Replies:** 0\ **Last updated:** [October 15, 2025, 11:38am UTC](https://uqworld.org/t/multiple-point-enrichment-in-alr-learning-function-based-stopping-criterion/9102 "2025-10-15T11:38:56Z")
Dear all, I am working on integrating active learning reliability in ZSoil. For now, it worked really well. Thanks for your great work! For multiple reasons, we would like to use multiple point enrichment combined with… --- ## [Error in Multi-Objective RBDO with UQLab](https://uqworld.org/t/error-in-multi-objective-rbdo-with-uqlab/4072)
**Author:** [@pouya\_zrbipour](https://uqworld.org/u/pouya_zrbipour)\ **Replies:** 1\ **Last updated:** [July 10, 2025, 2:37pm UTC](https://uqworld.org/t/error-in-multi-objective-rbdo-with-uqlab/4072 "2025-07-10T14:37:14Z")
Dear UQWorld Community, I am facing an error saying “Undefined function or variable ‘myInput’” when I run my Multi-objective reliability-based design optimization uq\_Ex08\_BermBreakwater\_constraint.m (1.1 KB) uq\_Ex08\_B… --- ## [Inverse Gaussian distribution](https://uqworld.org/t/inverse-gaussian-distribution/3651)
**Author:** [@Abdul\_Waris\_Kenue](https://uqworld.org/u/Abdul_Waris_Kenue)\ **Replies:** 5\ **Last updated:** [January 30, 2025, 5:13am UTC](https://uqworld.org/t/inverse-gaussian-distribution/3651 "2025-01-30T05:13:33Z")
Greetings, I am new to the UQLab/UQWorld interface and have found it to be an outstanding tool, significantly reducing the time I would otherwise spend developing and writing code from scratch. My research focuses on r… --- ## [Reliability analysis for a series system with two limit functions and 𝑛 n components in each function](https://uqworld.org/t/reliability-analysis-for-a-series-system-with-two-limit-functions-and-n-components-in-each-function/3784)
**Author:** [@Ali\_Jamali](https://uqworld.org/u/Ali_Jamali)\ **Replies:** 0\ **Last updated:** [August 20, 2024, 7:41am UTC](https://uqworld.org/t/reliability-analysis-for-a-series-system-with-two-limit-functions-and-n-components-in-each-function/3784 "2024-08-20T07:41:18Z")
We have two limit states as described below: %-------------------------------------------------- Rc = 7.35 + 8.87 - d; Rec = Dn50 .\* (fhb .\* (fH0 .\* ((2.2 .\* d - 1.2 .\* hs) ./ (d - hb)) .\* fN .\* fbeta .\* fskew .\* fgrad… --- ## [Question on Second Order Reliability Method (FORM) Theory in UQLab V2.1](https://uqworld.org/t/question-on-second-order-reliability-method-form-theory-in-uqlab-v2-1/3721)
**Author:** [@CsrCastillo](https://uqworld.org/u/CsrCastillo)\ **Replies:** 0\ **Last updated:** [June 28, 2024, 8:32pm UTC](https://uqworld.org/t/question-on-second-order-reliability-method-form-theory-in-uqlab-v2-1/3721 "2024-06-28T20:32:51Z")
Hy everyone. I was reading the last publication UQLAB USER MANUAL STRUCTURAL RELIABILITY (RARE EVENT ESTIMATION) where the SORM start with: and subsequently the condition of the Equation 1.30: And subsequently Equ… --- ## [Is it possible to save the snapshot from the ALR in an alternative location?](https://uqworld.org/t/is-it-possible-to-save-the-snapshot-from-the-alr-in-an-alternative-location/3666)
**Author:** [@colette.buchs](https://uqworld.org/u/colette.buchs)\ **Replies:** 0\ **Last updated:** [May 28, 2024, 11:32am UTC](https://uqworld.org/t/is-it-possible-to-save-the-snapshot-from-the-alr-in-an-alternative-location/3666 "2024-05-28T11:32:41Z")
Hi there, I am interested in running Active Learning Reliability as an asynchronous analysis. Specifically, I’d like to know: Is it possible to specify a location, where the snapshot is saved? Thanks a lot! --- ## [Access UQLab code & examples from Moustapha et al (2022)](https://uqworld.org/t/access-uqlab-code-examples-from-moustapha-et-al-2022/3620)
**Author:** [@dawnls](https://uqworld.org/u/dawnls)\ **Replies:** 0\ **Last updated:** [May 9, 2024, 5:52pm UTC](https://uqworld.org/t/access-uqlab-code-examples-from-moustapha-et-al-2022/3620 "2024-05-09T17:52:21Z")
I am new to UQLab and I’ve been trying to run through the problem sets that were defined in the benchmark study by Moustapha et al (2022), but I’m having trouble finding a lot of info in the UQLab documentation. The pape… --- ## [Reliability with multiple responses and same input variables](https://uqworld.org/t/reliability-with-multiple-responses-and-same-input-variables/740)
**Author:** [@aokoro](https://uqworld.org/u/aokoro)\ **Replies:** 3\ **Last updated:** [April 26, 2024, 11:17pm UTC](https://uqworld.org/t/reliability-with-multiple-responses-and-same-input-variables/740 "2024-04-26T23:17:23Z")
Hi All, Thanks for the wonderful uqlab software. Please I need help on the best approach of dealing with the reliability analysis of three limit state functions describing a particular structure with the same input var… --- ## [Computational model without and with conditional expressions in Structural Reliability](https://uqworld.org/t/computational-model-without-and-with-conditional-expressions-in-structural-reliability/3569)
**Author:** [@CsrCastillo](https://uqworld.org/u/CsrCastillo)\ **Replies:** 1\ **Last updated:** [April 26, 2024, 8:49am UTC](https://uqworld.org/t/computational-model-without-and-with-conditional-expressions-in-structural-reliability/3569 "2024-04-26T08:49:38Z")
Hello everyone. The UQLab V2.0 structural reliability module contains the approximation (FORM, SORM) and simulation (MCS, MCS-IS, MCS-SS) methods to estimate the probability of failure (P\_f) and reliability index (\\beta)… --- ## [Probability of failure of 10^{-16} with MCS on an HPC server](https://uqworld.org/t/probability-of-failure-of-10-16-with-mcs-on-an-hpc-server/3478)
**Author:** [@CsrCastillo](https://uqworld.org/u/CsrCastillo)\ **Replies:** 6\ **Last updated:** [April 9, 2024, 4:30pm UTC](https://uqworld.org/t/probability-of-failure-of-10-16-with-mcs-on-an-hpc-server/3478 "2024-04-09T16:30:36Z")
Hello everyone. I am planning my research with UQLab V2.0 and MATLAB 2018 installed on an HPC server. Especially I hope to estimate a very small probability of failure with Monte Carlo simulation (MCS) method. I am looki… --- ## [Bounds only on a part of a limit state equation](https://uqworld.org/t/bounds-only-on-a-part-of-a-limit-state-equation/2034)
**Author:** [@Gia](https://uqworld.org/u/Gia)\ **Replies:** 0\ **Last updated:** [December 1, 2023, 12:58pm UTC](https://uqworld.org/t/bounds-only-on-a-part-of-a-limit-state-equation/2034 "2023-12-01T12:58:54Z")
Hi, is there a way to put bounds not only on a single variable of a Limit State Function (LSF) but directly on a part of it? For example, if the LSF is g(x) = ‘\[X(:,1).\*X(:,2) - X(:,3).\*X(:,4)\] - X(:,5)’, is there a way… --- ## [Rare Event Estimation](https://uqworld.org/t/rare-event-estimation/1957)
**Author:** [@Gia](https://uqworld.org/u/Gia)\ **Replies:** 1\ **Last updated:** [August 3, 2023, 8:05am UTC](https://uqworld.org/t/rare-event-estimation/1957 "2023-08-03T08:05:25Z")
Hi. I am a beginner: what do you suggest for Rare Event Estimation (Pf 10^-9/10)? --- ## [Help with understanding UQLAB application to sample case](https://uqworld.org/t/help-with-understanding-uqlab-application-to-sample-case/1954)
**Author:** [@Ljuli2](https://uqworld.org/u/Ljuli2)\ **Replies:** 1\ **Last updated:** [July 26, 2023, 7:17am UTC](https://uqworld.org/t/help-with-understanding-uqlab-application-to-sample-case/1954 "2023-07-26T07:17:08Z")
Hello All, I am looking for a Uncertainty Quantification software that can has various capabilities required. I am looking into UQLAB as a platform to satisfy this search. It would be great if anyone here can take a look… --- ## [Questions about obtaining the statistical moments of PCE model](https://uqworld.org/t/questions-about-obtaining-the-statistical-moments-of-pce-model/1925)
**Author:** [@zhangshengwang](https://uqworld.org/u/zhangshengwang)\ **Replies:** 1\ **Last updated:** [July 1, 2023, 1:16am UTC](https://uqworld.org/t/questions-about-obtaining-the-statistical-moments-of-pce-model/1925 "2023-07-01T01:16:30Z")
Hi everyone, I am very honor to join the community of UQLab. Recently, I came across a problem about the PCE model. I am looking forward to the answer. I would like to obtain the first four moments of PCE model. I have… --- ## [Inserting a Kriging model into LSF for MC reliability analysis](https://uqworld.org/t/inserting-a-kriging-model-into-lsf-for-mc-reliability-analysis/1929)
**Author:** [@a7m3dbalushi](https://uqworld.org/u/a7m3dbalushi)\ **Replies:** 1\ **Last updated:** [June 28, 2023, 3:56pm UTC](https://uqworld.org/t/inserting-a-kriging-model-into-lsf-for-mc-reliability-analysis/1929 "2023-06-28T15:56:25Z")
Hello, I have built a Kriging model which will give me an output for a variable that I will use in a limit state function, I want to perform reliability analysis for the limit state function by MCS. I do not know how to… --- ## [Can I view or access the mathematical formula or programming source code for the algorithm?](https://uqworld.org/t/can-i-view-or-access-the-mathematical-formula-or-programming-source-code-for-the-algorithm/1897)
**Author:** [@yl\_z](https://uqworld.org/u/yl_z)\ **Replies:** 0\ **Last updated:** [May 23, 2023, 11:13am UTC](https://uqworld.org/t/can-i-view-or-access-the-mathematical-formula-or-programming-source-code-for-the-algorithm/1897 "2023-05-23T11:13:18Z")
Hello, community friends, it is a great honor to use UQlab such a convenient and easy to use tool. UQlab’s algorithm follows the black box method, which means that these algorithms are encapsulated in the software, as a … --- ## [Choice of distribution for the construction of a meta-model](https://uqworld.org/t/choice-of-distribution-for-the-construction-of-a-meta-model/1666)
**Author:** [@Jocelyn.Minini](https://uqworld.org/u/Jocelyn.Minini)\ **Replies:** 1\ **Last updated:** [May 19, 2023, 1:14pm UTC](https://uqworld.org/t/choice-of-distribution-for-the-construction-of-a-meta-model/1666 "2023-05-19T13:14:00Z")
Hello, After several months of intensive use of UQLab and several probabilistic studies on geotechnical cases, I would like to ask a question that has been bothering me for a long time. This question concerns the distri… --- ## [RBDO: constraint function is a finite element model](https://uqworld.org/t/rbdo-constraint-function-is-a-finite-element-model/1816)
**Author:** [@Mr121Tony](https://uqworld.org/u/Mr121Tony)\ **Replies:** 2\ **Last updated:** [March 13, 2023, 8:26am UTC](https://uqworld.org/t/rbdo-constraint-function-is-a-finite-element-model/1816 "2023-03-13T08:26:22Z")
Dear professors: I have one question: When there is a limit state function in the constraint function that is a result of the finite element model calculations, and I’m going to replace this finite element model with a … --- ## [Low and High Fidelity (LF/HF) Data](https://uqworld.org/t/low-and-high-fidelity-lf-hf-data/1799)
**Author:** [@aokoro](https://uqworld.org/u/aokoro)\ **Replies:** 2\ **Last updated:** [February 24, 2023, 11:52am UTC](https://uqworld.org/t/low-and-high-fidelity-lf-hf-data/1799 "2023-02-24T11:52:24Z")
Hi Friends, Thanks UQ team for the amazing tool uqlab. Please I have two fundamental questions and I will appreciate any clarity/help from members of this forum as well as any source maybe for further read. Please wh… --- ## [Confusion about equation (1.37) in the UQLab User Manual Structural Reliability (Rare Event Estimation)](https://uqworld.org/t/confusion-about-equation-1-37-in-the-uqlab-user-manual-structural-reliability-rare-event-estimation/1756)
**Author:** [@Jingyu\_Liu](https://uqworld.org/u/Jingyu_Liu)\ **Replies:** 1\ **Last updated:** [January 3, 2023, 11:09am UTC](https://uqworld.org/t/confusion-about-equation-1-37-in-the-uqlab-user-manual-structural-reliability-rare-event-estimation/1756 "2023-01-03T11:09:10Z")
Hello all, I am really confused about the expression of MCS estimatior (Page.11, eqn (1.37)) in Structural Reliability manual (Version:UQLAB-V2.0-107): Personally, I think it is inaccurate or incorrect As an estimato… --- ## [How to implement Isight to connect with UQlab to complete the building of active learning surrogate model?](https://uqworld.org/t/how-to-implement-isight-to-connect-with-uqlab-to-complete-the-building-of-active-learning-surrogate-model/1663)
**Author:** [@Jeff](https://uqworld.org/u/Jeff)\ **Replies:** 2\ **Last updated:** [December 2, 2022, 1:25am UTC](https://uqworld.org/t/how-to-implement-isight-to-connect-with-uqlab-to-complete-the-building-of-active-learning-surrogate-model/1663 "2022-12-02T01:25:41Z")
How to implement Isight to connect with UQlab to complete the building of active learning surrogate model?Anyone who has done this work, please contact me. Thanks. --- ## [About Isight Calling UQLab Unable to Recognize the matlab Program](https://uqworld.org/t/about-isight-calling-uqlab-unable-to-recognize-the-matlab-program/1738)
**Author:** [@zfzcyt0923](https://uqworld.org/u/zfzcyt0923)\ **Replies:** 0\ **Last updated:** [December 1, 2022, 11:57am UTC](https://uqworld.org/t/about-isight-calling-uqlab-unable-to-recognize-the-matlab-program/1738 "2022-12-01T11:57:31Z")
Dear UQlab Hello! I am a novice in UQlab. In my research direction, I have built a UQlab deployment for a single design point. However, during the process of using Isight to call UQlab to perform optimization, it shows… --- ## [Resource on Polynomial Chaos Expansion](https://uqworld.org/t/resource-on-polynomial-chaos-expansion/1735)
**Author:** [@aokoro](https://uqworld.org/u/aokoro)\ **Replies:** 2\ **Last updated:** [November 30, 2022, 9:18am UTC](https://uqworld.org/t/resource-on-polynomial-chaos-expansion/1735 "2022-11-30T09:18:44Z")
Hi Community Members, Please could anyone recommend a good and simplified book/ paper(s) / other resource where I could read about ‘Polynomial Chaos Expansion’ with basic information of the process . I wish to compleme… --- ## [RBDO using hybrid GA for optimization - local and global cost plot](https://uqworld.org/t/rbdo-using-hybrid-ga-for-optimization-local-and-global-cost-plot/1733)
**Author:** [@aokoro](https://uqworld.org/u/aokoro)\ **Replies:** 2\ **Last updated:** [November 22, 2022, 10:02pm UTC](https://uqworld.org/t/rbdo-using-hybrid-ga-for-optimization-local-and-global-cost-plot/1733 "2022-11-22T22:02:58Z")
Hi All, Thanks for this useful platform. Please appreciate your thoughts on this. I carried out a surrogate assisted RBDO using hybrid GA and had the following cost values for both the global and local cost Global (2 … --- ## [RBDO Concept](https://uqworld.org/t/rbdo-concept/1729)
**Author:** [@aokoro](https://uqworld.org/u/aokoro)\ **Replies:** 2\ **Last updated:** [November 8, 2022, 5:17pm UTC](https://uqworld.org/t/rbdo-concept/1729 "2022-11-08T17:17:14Z")
Hi All, Thanks for the amazing software. Please I have a very fundamental question and appreciate thoughts on this. In a two-level RBDO process please how is surrogate construction, reliability and optimization integra… --- ## [Error: uq\_gradient (line 180) ExpDesign(ii).Y = fun(ExpDesign(ii).X);](https://uqworld.org/t/error-uq-gradient-line-180-expdesign-ii-y-fun-expdesign-ii-x/1723)
**Author:** [@koumm152](https://uqworld.org/u/koumm152)\ **Replies:** 2\ **Last updated:** [October 8, 2022, 7:03am UTC](https://uqworld.org/t/error-uq-gradient-line-180-expdesign-ii-y-fun-expdesign-ii-x/1723 "2022-10-08T07:03:06Z")
clc clear all format long %% mu\_x = \[3 15 125 5 48 22\]; sig\_x = \[0.00015 0.00075 0.000625 0.0025 0.24 0.0011\]; rA =1.43e4; h = 3.78; ns = length(mu\_x); uqlab; %% G = @(mu\_x)rA-(mu\_x(:,1).\*mu\_x(:,2).\*mu\_x(:,3).\*mu\_x(:,4… --- ## [Active learning metamodel - multiple enrichment](https://uqworld.org/t/active-learning-metamodel-multiple-enrichment/1678)
**Author:** [@aokoro](https://uqworld.org/u/aokoro)\ **Replies:** 0\ **Last updated:** [July 29, 2022, 8:45am UTC](https://uqworld.org/t/active-learning-metamodel-multiple-enrichment/1678 "2022-07-29T08:45:50Z")
Good Day All, Thanks for the amazing software and community. Please could someone explain to me the concept of multiple enrichment of experimental design lets say using a U learning function and the k-means clustering a… --- ## [Time-dependent reliability algorithm](https://uqworld.org/t/time-dependent-reliability-algorithm/1661)
**Author:** [@Mr121Tony](https://uqworld.org/u/Mr121Tony)\ **Replies:** 2\ **Last updated:** [July 14, 2022, 1:56am UTC](https://uqworld.org/t/time-dependent-reliability-algorithm/1661 "2022-07-14T01:56:41Z")
Is there any time-dependent reliability algorithm implemented in UQLab? [Next page](https://uqworld.org/tag/reliability/7.md?match_all_tags=true&page=1&tags%5B%5D=reliability)