(octave.info)Marker Styles

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15.4.3 Marker Styles
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Marker styles are specified by the following properties:

‘marker’
     A character indicating a plot marker to be place at each data
     point, or "none", meaning no markers should be displayed.

‘markeredgecolor’
     The color of the edge around the marker, or "auto", meaning that
     the edge color is the same as the face color.  Note: Colors.

‘markerfacecolor’
     The color of the marker, or "none" to indicate that the marker
     should not be filled.  Note: Colors.

‘markersize’
     A number specifying the size of the marker.  The default is 1.  A
     value of 2 is twice as large as the default, etc.

   The ‘colstyle’ function will parse a ‘plot’-style specification and
will return the color, line, and marker values that would result.

 -- : [STYLE, COLOR, MARKER, MSG] = colstyle (STYLE)
     Parse the line specification STYLE and return the line style,
     color, and markers given.

     In the case of an error, the string MSG will return the text of the
     error.