René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"pzmap(sys, grid=True) fails","articleBody":"This is with python-control@08d5e6c and matplotlib 3.3.0.  I tried commenting out the offending line (the one calling `angle_helper.ExtremeFinderCycle._adjust_extremes`), and got an error deep in mpl_toolkit.\r\n\r\n```python\r\nimport control\r\ng = control.tf(1, [1,1])\r\ncontrol.pzmap(g, grid=True)\r\n```\r\n\r\nTraceback:\r\n\r\n```\r\n---------------------------------------------------------------------------\r\nAttributeError                            Traceback (most recent call last)\r\n\u003cipython-input-7-4e6a52bd77da\u003e in \u003cmodule\u003e\r\n      1 import control\r\n      2 g = control.tf(1, [1,1])\r\n----\u003e 3 control.pzmap(g, grid=True)\r\n\r\n~/src/python-control/control/pzmap.py in pzmap(sys, plot, grid, title, **kwargs)\r\n    104                 ax, fig = zgrid()\r\n    105             else:\r\n--\u003e 106                 ax, fig = sgrid()\r\n    107         else:\r\n    108             ax, fig = nogrid()\r\n\r\n~/src/python-control/control/grid.py in sgrid()\r\n     80     ax.axis[:].invert_ticklabel_direction()\r\n     81 \r\n---\u003e 82     ax.axis[\"wnxneg\"] = axis = ax.new_floating_axis(0, 180)\r\n     83     axis.set_ticklabel_direction(\"-\")\r\n     84     axis.label.set_visible(False)\r\n\r\n~/.miniconda3/envs/control-dev/lib/python3.8/site-packages/mpl_toolkits/axisartist/axislines.py in new_floating_axis(self, nth_coord, value, axis_direction)\r\n    571     def new_floating_axis(self, nth_coord, value, axis_direction=\"bottom\"):\r\n    572         gh = self.get_grid_helper()\r\n--\u003e 573         axis = gh.new_floating_axis(nth_coord, value,\r\n    574                                     axis_direction=axis_direction,\r\n    575                                     axes=self)\r\n\r\n~/.miniconda3/envs/control-dev/lib/python3.8/site-packages/mpl_toolkits/axisartist/grid_helper_curvelinear.py in new_floating_axis(self, nth_coord, value, axes, axis_direction)\r\n    348             self, nth_coord, value, axis_direction)\r\n    349 \r\n--\u003e 350         axisline = AxisArtist(axes, _helper)\r\n    351 \r\n    352         # _helper = FloatingAxisArtistHelper(self, nth_coord,\r\n\r\n~/.miniconda3/envs/control-dev/lib/python3.8/site-packages/mpl_toolkits/axisartist/axis_artist.py in __init__(self, axes, helper, offset, axis_direction, **kwargs)\r\n    744         self._axis_direction = axis_direction\r\n    745 \r\n--\u003e 746         self._init_line()\r\n    747         self._init_ticks(**kwargs)\r\n    748         self._init_offsetText(axis_direction)\r\n\r\n~/.miniconda3/envs/control-dev/lib/python3.8/site-packages/mpl_toolkits/axisartist/axis_artist.py in _init_line(self)\r\n    885         if axisline_style is None:\r\n    886             self.line = PathPatch(\r\n--\u003e 887                 self._axis_artist_helper.get_line(self.axes),\r\n    888                 color=rcParams['axes.edgecolor'],\r\n    889                 fill=False,\r\n\r\n~/.miniconda3/envs/control-dev/lib/python3.8/site-packages/mpl_toolkits/axisartist/grid_helper_curvelinear.py in get_line(self, axes)\r\n    268 \r\n    269     def get_line(self, axes):\r\n--\u003e 270         self.update_lim(axes)\r\n    271         x, y = self.grid_info[\"line_xy\"]\r\n    272 \r\n\r\n~/.miniconda3/envs/control-dev/lib/python3.8/site-packages/mpl_toolkits/axisartist/grid_helper_curvelinear.py in update_lim(self, axes)\r\n     99 \r\n    100     def update_lim(self, axes):\r\n--\u003e 101         self.grid_helper.update_lim(axes)\r\n    102 \r\n    103         x1, x2 = axes.get_xlim()\r\n\r\n~/.miniconda3/envs/control-dev/lib/python3.8/site-packages/mpl_toolkits/axisartist/axislines.py in update_lim(self, axes)\r\n    325 \r\n    326         if self._force_update or self._old_limits != (x1, x2, y1, y2):\r\n--\u003e 327             self._update(x1, x2, y1, y2)\r\n    328             self._force_update = False\r\n    329             self._old_limits = (x1, x2, y1, y2)\r\n\r\n~/.miniconda3/envs/control-dev/lib/python3.8/site-packages/mpl_toolkits/axisartist/grid_helper_curvelinear.py in _update(self, x1, x2, y1, y2)\r\n    317         if self.valid() and self._old_values == (x1, x2, y1, y2):\r\n    318             return\r\n--\u003e 319         self._update_grid(x1, y1, x2, y2)\r\n    320         self._old_values = (x1, x2, y1, y2)\r\n    321         self._force_update = False\r\n\r\n~/.miniconda3/envs/control-dev/lib/python3.8/site-packages/mpl_toolkits/axisartist/grid_helper_curvelinear.py in _update_grid(self, x1, y1, x2, y2)\r\n    365 \r\n    366     def _update_grid(self, x1, y1, x2, y2):\r\n--\u003e 367         self.grid_info = self.grid_finder.get_grid_info(x1, y1, x2, y2)\r\n    368 \r\n    369     def get_gridlines(self, which=\"major\", axis=\"both\"):\r\n\r\n~/.miniconda3/envs/control-dev/lib/python3.8/site-packages/mpl_toolkits/axisartist/grid_finder.py in get_grid_info(self, x1, y1, x2, y2)\r\n    102         \"\"\"\r\n    103 \r\n--\u003e 104         extremes = self.extreme_finder(self.inv_transform_xy, x1, y1, x2, y2)\r\n    105 \r\n    106         # min \u0026 max rage of lat (or lon) for each grid line will be drawn.\r\n\r\n~/src/python-control/control/grid.py in __call__(self, transform_xy, x1, y1, x2, y2)\r\n     42 \r\n     43         lon_min, lon_max, lat_min, lat_max = \\\r\n---\u003e 44             self._adjust_extremes(lon_min, lon_max, lat_min, lat_max)\r\n     45 \r\n     46         return lon_min, lon_max, lat_min, lat_max\r\n\r\nAttributeError: 'ModifiedExtremeFinderCycle' object has no attribute '_adjust_extremes'\r\n```","author":{"url":"https://github.com/roryyorke","@type":"Person","name":"roryyorke"},"datePublished":"2020-08-21T18:06:06.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/457/python-control/issues/457"}