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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Incorrect nyquist plot","articleBody":"I'm using the control package with python 3.10 in Pycharm and Jupiter lab.\r\nI have stumbled upon a possible issue while trying to create a Nyquist plot for a simple system\r\n```\r\nimport control as ct\r\n\r\ns = ct.tf('s'))\r\nplant_1 = 1/(s*(s + 5)*(s + 7)))\r\nct.nyquist_plot(plant_1)\r\n\r\n```\r\n\r\nThe result I'm getting is this: \r\n\r\n![download](https://user-images.githubusercontent.com/71692928/210130333-bafd7ce3-a131-4cc9-b54e-a9bf1d92af6e.png)\r\n\r\n While in MATLAB I'm getting different results\r\n\r\n```\r\nclear all;\r\nclose all;\r\nclc;\r\n\r\n\r\ns = tf('s');\r\nplant_1 = 1/(s*(s + 5)*(s + 7));\r\nnyquistplot(plant_1)\r\n\r\n```\r\n![image](https://user-images.githubusercontent.com/71692928/210130422-430d7e7f-9cc1-4f95-9ef0-0a9db3c00490.png)\r\n\r\n\r\n**Is there a limitation that might be causing this issue or am I missing something?**\r\n\r\n\r\n","author":{"url":"https://github.com/Avitan01","@type":"Person","name":"Avitan01"},"datePublished":"2022-12-31T08:28:08.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/830/python-control/issues/830"}