[R] how to connect dots by passing NA

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Re: [R] Saving Chinese text in Quartz

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[R] Saving Chinese text in Quartz

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[R] Spidergram?

This maybe a very stupid question. But, I'm trying to figure out how to draw the so-called "Spidergram" from a set of data, say, 15 chemical elements (on horizontal axis), and the concentration of each element from 60 stations (on vertical axis). So the matrix will be 15 x 60. The values of each st