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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"evalfr does not behave as expected [sf#6]","articleBody":"**Reported by *anonymous on 2013-05-24 14:32 UTC**\nThe current implementation of evalfr is different from the matlab function evalfr. Could you please \"fix\" it.\n\nExample: Evaluate the transfer function G=tf(1,[2,3,4]) at s=1+2j\n\nIn Matlab one would type evalfr(G,s) and get the expectet result (0.0051-0.0711j).\nUsing this module typing evalfr(G,s) will actually compute evalfr(G,s*j) which is (0.09756098+0.12195122j), that is, it evaluated G at the point -2+j instead.\n\nI agree that this is what one would expect (after reading the documentation of evalfr) but I would rather have a behavior that conforms with matlab (after all the module control.matlab was designed to emulate matlab's routines)\n\nThanks,\n\nJuan C. Cockburn\njuan.cockburn@rit.edu\n","author":{"url":"https://github.com/murrayrm","@type":"Person","name":"murrayrm"},"datePublished":"2014-08-09T20:23:18.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":11},"url":"https://github.com/22/python-control/issues/22"}