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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Modest proposal for discussion: eliminate `LinearICSystem` class","articleBody":"It is not clear to me what purpose there is for a `LinearICSystem`. One possibility is as a biquad cascade*, but this can already be implemented by forcing the interconnected systems to be `NonlinearIOSystems`, and is not currently supported by `LinearICSystem`s anyway because the constituent systems are combined into a single system with A, B, C, D matrices and signal names. \r\n\r\nIs there any other use case for a `LinearICSystem`? I can't figure out what benefit there is to preserving other characteristics of an `InterconnectedSystem`, if such a system is always used in an equivalent way to a `LinearIOSystem`.  \r\n\r\n*There are cases when you don't want a combined interconnected series of systems to be tunred into a single state-space or transfer function system. For example, if you want to numerically interconnect a series of linear systems to create a biquad cascade to avoid numerical issues that crop up when combining large and small coefficients. This comes up for example when implementing a high-order pade approximation (see e.g. https://www.embeddedrelated.com/showarticle/927.php) \r\n\r\n","author":{"url":"https://github.com/sawyerbfuller","@type":"Person","name":"sawyerbfuller"},"datePublished":"2022-11-07T19:09:40.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/786/python-control/issues/786"}