René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Can't step a zero degree polynomial","articleBody":"When running:\r\n```\r\nimport control as ctrl\r\nG = ctrl.tf([1],[1])\r\n(y, t) = ctrl.step(G)\r\n```\r\n\r\nI get this error (I get the same in python 2.7 and 3.5):\r\n\r\nTraceback (most recent call last):\r\n  File \"./prueba.py\", line 10, in \u003cmodule\u003e\r\n    (y, t) = ctrl.step(G)\r\n  File \"/usr/local/lib/python3.5/dist-packages/control/matlab.py\", line 1328, in step\r\n    transpose = True, **keywords)\r\n  File \"/usr/local/lib/python3.5/dist-packages/control/timeresp.py\", line 483, in step_response\r\n    sys = _get_ss_simo(sys, input, output)\r\n  File \"/usr/local/lib/python3.5/dist-packages/control/timeresp.py\", line 409, in _get_ss_simo\r\n    sys_ss = _convertToStateSpace(sys)\r\n  File \"/usr/local/lib/python3.5/dist-packages/control/statesp.py\", line 656, in _convertToStateSpace\r\n    ssout = td04ad('R',sys.inputs, sys.outputs, index, den, num,tol=0.0)\r\n  File \"/usr/local/lib/python3.5/dist-packages/slycot/transform.py\", line 423, in td04ad\r\n    out = _wrapper.td04ad_r(m,p,index,dcoeff,ucoeff,n,tol,ldwork)\r\nValueError: failed to create intent(cache|hide)|optional array-- must have defined dimensions but got (1,0,)","author":{"url":"https://github.com/marianomds","@type":"Person","name":"marianomds"},"datePublished":"2017-11-20T03:18:13.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/165/python-control/issues/165"}