默认画出来, 是这么个分辨率:
参考这个以后, 发现应该调png参数res. 可是R babel直接用的png函数, 没给参数. 有什么办法设定R babel的png这些的参数么?
这个问题虽然分辨率怎么调还是不知道, 但以另一种方式解决了, 用svg格式, 不用png
官网的documentation is all you need R Source Code Blocks in Org Mode
Graphics Header Arguments
There are many R-specific header arguments used to configure R graphics devices. They include:
width
the width of the graphics region, default value is 7 (inches) or 480 (pixels)
height
the height of the graphics region, default value is 7 (inches) or 480 (pixels)
units
the units in which width and height are given – px , in , cm , or mm . Note that the default units are set by the file type: in for pdf and ps, px for jpeg, bmp, png, tiff
bg
the background color defaults to “transparent”
fg
the foreground color defaults to “black”
pointsize
the default point size in the graphics defaults to 12
quality
the quality of a JPEG image as a percentage
compression
the type of compression to be used
res
the nominal resolution in pixels per inch
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如果你的图片的数据点很多，导出为pdf或者html的时候建议别用svg，这会让内容的渲染特别慢。一般数据点超过几千个就最好用png。
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