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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Incorrect plot when arguments are blocks of an Eigen::Matrix","articleBody":"If I declare an\r\n\r\nEigen::Matrix _2D_data; /* The initialization does not matter. The first row holds the x-coordinates, and the second row holds the y- \r\n                                          coordinates. */\r\n\r\nand I want to call\r\n\r\nplt::plot(_2D_data.row(1), _2D_data.row(2));\r\n\r\nthe resulting plot will not be correct. Around 50% of the points will have their coordinates reversed (the x-coordinates will become y-coordinates and vice-versa).\r\n\r\nTo correctly plot, I have to write:\r\n\r\nEigen::VectorX x_coords{ _2D_data.row(0) };\r\nEigen::VectorX y_coords{ _2D_data.row(1) };\r\n\r\nplt::plot(x_coords, y_coords);\r\n\r\nThanks for the otherwise great library!\r\n","author":{"url":"https://github.com/Lavinius","@type":"Person","name":"Lavinius"},"datePublished":"2022-01-17T14:37:08.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/2/matplotlib-cpp/issues/2"}