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help for ^circvplt^
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Cumulative vector plot for circular data
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    ^circvplt^ varname [^if^ exp] [^in^ range]
    [ ^, ahl(^#^) uti^tle^(^str^) lti^tle^(^str^) r^otate^(^#^)^
    ^f^udge^(^#^) sa^ving^(^filename^)^ ]

Description
-----------

^circvplt^ 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. A
separate arrow indicates North.

Pen 1 is used for the text and North arrow.
Pen 4 is used for the vectors.
Pen 5 is used for the resultant.

Recommended printing thicknesses: pen 1 at 2
                                  pen 4 at 2
                                  pen 5 at 8

Options
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^ahl(^#^)^ specifies the arrowhead length on the arrow indicating the
    mean direction. Default 600.

^utitle(^string^)^ defines an upper title.

^ltitle(^string^)^ defines a lower title. The default indicates the
    mean direction and vector strength. A single period ^.^ will have
    the effect of blanking out this default.

^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.

^fudge(^#^)^ changes the ratio of vertical and horizontal lengths on the
    plot. The default is 69189/64000 and is designed to achieve an
    aspect ratio when printed.

^saving(^filename^)^ saves the graph in filename.


Example
-------

        . ^circvplt wallasp, uti("Lake District cirques wall aspect")^


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


Also see
--------

On-line: help for @circdplt@, @circrplt@, @circsumm@