{"about":{"site":"https://codewithpapers.app","non_affiliation":"Code with Papers and Syntology are not affiliated with, endorsed by, or sponsored by Papers with Code, Meta, or the pwc-archive mirror.","licence":"CC BY-SA 4.0","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","attribution":"https://codewithpapers.app/attribution","modified":"archive material modified by Syntology; see the attribution page"},"url":"/paper/ncon-a-tensor-network-contractor-for-matlab","title":"NCON: A tensor network contractor for MATLAB","arxiv_id":"1402.0939","date":"2014-02-05","proceeding":null,"authors":["Robert N. C. Pfeifer","Glen Evenbly","Sukhwinder Singh","Guifre Vidal"],"abstract":"A fundamental process in the implementation of any numerical tensor network algorithm is that of contracting a tensor network. In this process, a network made up of multiple tensors connected by summed indices is reduced to a single tensor or a number by evaluating the index sums. This article presents a MATLAB function ncon(), or \"Network CONtractor\", which accepts as its input a tensor network and a contraction sequence describing how this network may be reduced to a single tensor or number. As its output it returns that single tensor or number. The function ncon() may be obtained by downloading the source of this preprint.","url_abs":"http://arxiv.org/abs/1402.0939v3","url_pdf":"http://arxiv.org/pdf/1402.0939v3.pdf","source":{"archive":"pwc-archive (Hugging Face), CC BY-SA 4.0","snapshot":"2025-07-28","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","row_kind":"links_only","authors_date_abstract":"arXiv metadata, CC0 1.0 (https://info.arxiv.org/help/license), from the Kaggle arXiv metadata snapshot of 2026-09-12"},"code_links":[{"paper_slug":"ncon-a-tensor-network-contractor-for-matlab","repo_url":"https://github.com/Gilt-TNR/Gilt-TNR","is_official":0,"mentioned_in_paper":0,"mentioned_in_github":1,"framework":"none","reach":null},{"paper_slug":"ncon-a-tensor-network-contractor-for-matlab","repo_url":"https://github.com/JGMorley/mps_evolution","is_official":0,"mentioned_in_paper":0,"mentioned_in_github":1,"framework":"none","reach":null},{"paper_slug":"ncon-a-tensor-network-contractor-for-matlab","repo_url":"https://github.com/JGMorley/mps_langevin","is_official":0,"mentioned_in_paper":0,"mentioned_in_github":1,"framework":"none","reach":null},{"paper_slug":"ncon-a-tensor-network-contractor-for-matlab","repo_url":"https://github.com/Jutho/TensorOperations.jl","is_official":0,"mentioned_in_paper":0,"mentioned_in_github":1,"framework":"none","reach":null},{"paper_slug":"ncon-a-tensor-network-contractor-for-matlab","repo_url":"https://github.com/andrewdarmawan/tncontract","is_official":0,"mentioned_in_paper":0,"mentioned_in_github":1,"framework":"none","reach":null},{"paper_slug":"ncon-a-tensor-network-contractor-for-matlab","repo_url":"https://github.com/giacomogiudice/uMPS","is_official":0,"mentioned_in_paper":0,"mentioned_in_github":1,"framework":"none","reach":null},{"paper_slug":"ncon-a-tensor-network-contractor-for-matlab","repo_url":"https://github.com/leburgel/BadHonnefTutorial","is_official":0,"mentioned_in_paper":0,"mentioned_in_github":1,"framework":"none","reach":null},{"paper_slug":"ncon-a-tensor-network-contractor-for-matlab","repo_url":"https://github.com/mganahl/cMERAlib","is_official":0,"mentioned_in_paper":0,"mentioned_in_github":1,"framework":"none","reach":null},{"paper_slug":"ncon-a-tensor-network-contractor-for-matlab","repo_url":"https://github.com/mhauru/NCon.jl","is_official":0,"mentioned_in_paper":0,"mentioned_in_github":1,"framework":"none","reach":null},{"paper_slug":"ncon-a-tensor-network-contractor-for-matlab","repo_url":"https://github.com/mhauru/ncon","is_official":0,"mentioned_in_paper":0,"mentioned_in_github":1,"framework":"none","reach":null},{"paper_slug":"ncon-a-tensor-network-contractor-for-matlab","repo_url":"https://github.com/mingruyang/emergentsymmetry","is_official":0,"mentioned_in_paper":0,"mentioned_in_github":1,"framework":"none","reach":null},{"paper_slug":"ncon-a-tensor-network-contractor-for-matlab","repo_url":"https://github.com/ycyuustc/matlab","is_official":0,"mentioned_in_paper":0,"mentioned_in_github":1,"framework":"none","reach":{"status":"ok","spdx":"Unlicense"}}],"tasks":[],"methods":[],"datasets_introduced":[],"methods_introduced":[],"results":[],"syntology":{"atlas_url":null,"mcp":null,"developers":"https://syntology.ai/developers"},"arxiv_metadata":null,"syntology_extracted_results":null}