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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Issue when trying to plot points with transform that requires more/fewer coordinates than it returns","articleBody":"Let's say we have a transform `tr` that takes 2-dimensional input and returns 2-dimensional input. If I do:\n\n```\nplt.plot(x, y, transform=tr)\n```\n\n`x` and `y` will get passed to `tr.transform`. Now in some cases the transformation may require 3 coordinates and return 2 'final' coordinates to be plotted (e.g. https://github.com/astrofrog/wcsaxes/pull/148).\n\nFor example I might have a transformation that takes longitude, latitude, and altitude and translates these into a 2-d position in a satellite image. In this case if I want to plot points I'd like to be able to do:\n\n```\nplt.plot(longitude, latitude, altitude, transform=tr)\n```\n\nHowever this doesn't work (and I tried a few other ways to). Is there a way to get this to work, and if not, could it be considered as a feature request? Just to be clear, the transform would always return two coordinates, but could take any arbitrary number of inputs.\n","author":{"url":"https://github.com/astrofrog","@type":"Person","name":"astrofrog"},"datePublished":"2015-01-08T20:17:01.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/3983/matplotlib/issues/3983"}