However, rather than use download.file() to store the PNG locally, then re-loading it, it would be preferable to load the PNG directly from the URL. ... <看更多>
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However, rather than use download.file() to store the PNG locally, then re-loading it, it would be preferable to load the PNG directly from the URL. ... <看更多>
Most content is shared to Facebook as a URL, so it's important that you mark up your website with Open Graph ... One of image/jpeg , image/gif or image/png. ... <看更多>