René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"lti.evalfr and sys._evalfr have different behavior","articleBody":"The ``evalfr`` function in the ``lti`` module expects a complex number and evaluates the system at that complex frequency. The method ``sys._evalfr``, on the other hand, where sys is a transfer function or state space system, expects a real argument and multiplies it by j before evaluating the frequency response. \r\n\r\nIs this dichotomy intentional? \r\n\r\n* matlab's ``evalfr`` [function](https://www.mathworks.com/help/control/ref/evalfr.html) expects a complex number, which seems like a more general-purpose solution. ``sys.freqresp`` expects real-valued omega arguments, making it perhaps a better interface for users\r\n*  also, right now, only ``sys._evalfr`` correctly performs the z-plane transformation for discrete-time systems. ","author":{"url":"https://github.com/sawyerbfuller","@type":"Person","name":"sawyerbfuller"},"datePublished":"2020-07-23T09:41:25.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":13},"url":"https://github.com/434/python-control/issues/434"}