René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Inconsistent indexing of row and column label cells by Tables","articleBody":"In presence of row and column labels, the cell indexing by the Table class is inconsistent: column labels have row index 0, but row labels have column index -1:\r\n```\r\nfrom pylab import *\r\ngca().set_axis_off()\r\nt = table(\r\n    cellText=[[\"a\", \"b\"], [\"c\", \"d\"]],\r\n    rowLabels=[\"row1\", \"row2\"],\r\n    colLabels=[\"col1\", \"col2\"],\r\n)\r\nfor (i, j), cell in sorted(t.get_celld().items()):\r\n    print(i, j, cell.get_text())\r\nshow()\r\n```\r\ngives\r\n```\r\n0 0 Text(0, 0, 'col1')\r\n0 1 Text(0, 0, 'col2')\r\n1 -1 Text(0, 0, 'row1')\r\n1 0 Text(0, 0, 'a')\r\n1 1 Text(0, 0, 'b')\r\n2 -1 Text(0, 0, 'row2')\r\n2 0 Text(0, 0, 'c')\r\n2 1 Text(0, 0, 'd')\r\n```\r\n\r\nAs an example of bug caused by this API, the `text_labels_and_annotations/font_table_ttf_sfskip.py` example contains the seemingly innocuous code\r\n```\r\n    if row \u003e 0 and col \u003e 0:\r\n        cell.set_text_props(fontproperties=FontProperties(fname=fontname))\r\n```\r\nbut running the example, passing a local font pathname as argument (e.g. `python examples/text_labels_and_annotations/font_table_ttf_sgskip.py lib/matplotlib/mpl-data/fonts/ttf/cmr10.ttf` from the mpl root directory) shows that the first column of characters is not using the correct font.\r\n![test](https://user-images.githubusercontent.com/1322974/49481107-990e5100-f829-11e8-9e94-dc4b4a8b4a7b.png)\r\n\r\nIndeed, the correct code would have been\r\n```\r\n    if row \u003e 0 and col \u003e -1:\r\n        cell.set_text_props(fontproperties=FontProperties(fname=fontname))\r\n```\r\nwhich gives\r\n![correct](https://user-images.githubusercontent.com/1322974/49481102-94499d00-f829-11e8-8867-1517975b3f44.png)\r\n\r\nI think the inconsistency is error-prone enough to consider changing it (probably handling the deprecations depending on the value of a global switch).","author":{"url":"https://github.com/anntzer","@type":"Person","name":"anntzer"},"datePublished":"2018-12-05T00:05:26.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/12931/matplotlib/issues/12931"}