FAQ 004657 | I get the error "The stiffness matrix is singular!" for a calculation ...

Question: I get the error "The stiffness matrix is singular!" for a calculation in RF‑FORM‑FINDING. What can I do? Answer: In principle, a calculation with RF‑FORM‑FINDING has the same requirements as a calculation without this add-on module, so the criteria for general instabilities should be checked (see "Links"). However, problems often occur with RF‑FORM‑FINDING because the form-finding process has been activated for too many elements. Therefore, you should check whether the correct (necessary) elements have been activated (see Image 01). In the following example in Image 02, the form-finding has been activated for all horizontal members. This results in the error "The stiffness matrix is singular!" (see Image 03). If you deactivate the beam members, the calculation is successful (see Image 04). For more information, go to the FAQ page: ► www.dlubal.com/en-us/support-and-learning/support/… Did you find this video helpful? ► Let us know in the comments if you like this video. E-learning videos: ► RFEM 6 for beginners:    • E-Learning | RFEM 6 Tutorial for Begi...   ► Programming with RFEM 6 and Python:    • E-Learning | Programmieren mit RFEM 6...   ► RFEM 6 tutorial with Rhino & Grasshopper:    • E-Learning | RFEM 6-Tutorial mit Rhin...   Take advantage of our free support. Do you have any questions? ► Frequently Asked Questions (FAQ): www.dlubal.com/en/support-and-learning/support/faq ► Ask an individual question: www.dlubal.com/en/support-and-learning/support/ask… ► Knowledge Base: www.dlubal.com/en-US/support-and-learning/support/… Follow us and stay up to date: ► Subscribe to the Dlubal YouTube Channel: youtube.com/user/DlubalEN?sub_confirmation=1 ► Instagram: www.instagram.com/dlubal_software/ ► Are you also on Facebook? Follow us here: www.facebook.com/dlubal.software.english Keywords #DlubalFAQ #FormFinding #Unstable #Singular #StiffnessMatrix #FrequentlyAskedQuestion #FAQAboutDlubalSoftware #QuestionAndAnswerToDlubalSoftware

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