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help for ^circdiff^
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Difference between circular variables
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    ^circdiff^ varname1 varname2 ^, g^enerate^(^newvar^)^

Description
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^circdiff^ calculates the circular difference between varname1 and varname2,
both circular variables between 0 and 360 degrees, and puts it
in a new variable newvar. The difference is the shorter of the two
rotations taking varname2 to varname1, increasing azimuth or clockwise
being positive.

Option
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^generate(^newvar^)^ specifies the name of the new variable and is not
    optional.

Example
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        . ^circdiff axisasp wallasp, gen(diffasp)^

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

Also see
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On-line:  help for @circcorr@