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help for circvplot
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Cumulative vector plot for circular data

        circvplot varname [if exp] [in range] [, resultant(resultant_options)
                 rotate(#) twoway_options ]


Description 

    circvplot produces a cumulative vector plot for varname.  varname should
    be a circular variable taking on values between 0 and 360 degrees. Each
    value of varname is plotted as a unit vector. The vectors are sorted and
    plotted end to end, by default starting opposite the mean direction. The
    resultant of the vectors is also shown as an arrow.

    The graph will usually best be shown with xsize() and ysize() equal, or
    nearly so.


Options 

    resultant() specifies options controlling the rendering of the arrow
        showing the resultant. In particular, arrowheadfactor(#) specifies
        that the arrowhead length should be the default length (which is 7%
        of the resultant length) X a factor of #.  Otherwise, such options
        are typically appropriate connect_options.

    rotate() changes the direction at which plotting starts by a clockwise
        rotation of # degrees from the default of opposite the vector mean.
        Such rotation is needed occasionally to avoid producing a loop that
        cuts itself.

    twoway_options are options of twoway.  By default the subtitle()
        indicates the mean direction and vector strength and is at pos(6).
        Note that the degree symbol can be specified by `=char(176)'.


Example 

    . circvplot wallasp, title("Wall aspect", pos(12)) clcolor(blue)
        result(clcolor(red))
    . graph display, xsize(4) ysize(4)


Author

    Nicholas J. Cox, University of Durham, U.K.
    n.j.cox@durham.ac.uk


Also see

    On-line: help for circdplot (if installed), circrplot (if installed)