what is the 'ro' in plot() mean?

Various line types, plot symbols and colors may be obtained with
    plot(X,Y,S) where S is a character string made from one element
    from any or all the following 3 columns:
             b     blue          .     point              -     solid
             g     green         o     circle             :     dotted
             r     red           x     x-mark             -.    dashdot 
             c     cyan          +     plus               --    dashed   
             m     magenta       *     star             (none)  no line
             y     yellow        s     square
             k     black         d     diamond
             w     white         v     triangle (down)
                                 ^     triangle (up)
                                 <     triangle (left)
                                 >     triangle (right)
                                 p     pentagram
                                 h     hexagram

r and o are both listed as doing something independent of each other.

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Binzi Shu 2016-5-6

So I can combine them, like "go", "b." etc?

Image Analyst 2016-5-6

Yes, you can string together one from each column in a single quoted string. You can leave one or two out if you want, so you can have up to three (or 4) characters in the string, like 'ro-', 'ro', 'b--', 'mx-.', etc.

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