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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"dcgain on discrete-time systems is wrong","articleBody":"dcgain should distinguish between continuous- and discrete-time systems when determining DC gain.\n\n``` python\nimport control\ngct=control.tf([1],[1,1])\ngcs=control.ss(gct)\ngdt=control.sample_system(gct,5e-2,method='zoh')\ngds=control.ss(gdt)\nprint('gct.dcgain()',gct.dcgain())\nprint('gcs.dcgain()',gcs.dcgain())\nprint('gdt.dcgain()',gdt.dcgain())\nprint('gds.dcgain()',gds.dcgain())\nprint('gdt.horner(1)',gdt.horner(1))\nprint('gds.horner(1)',gds.horner(1))\n```\n\ngives\n\n```\ngct.dcgain() 1.0\ngcs.dcgain() 1.0\ngdt.dcgain() -0.051271096376024033\ngds.dcgain() -0.051271096376024033\ngdt.horner(1) [[ 1.+0.j]]\ngds.horner(1) [[ 1.]]\n```\n","author":{"url":"https://github.com/roryyorke","@type":"Person","name":"roryyorke"},"datePublished":"2016-09-22T18:56:40.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/114/python-control/issues/114"}