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help for fourier
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Fourier series creation 

        fourier degvar [if exp] [in range] [, cstub(str) sstub(str) npairs(#)
                 ]


Description 

    fourier creates new variables which are

        cos(i * degvar * pi / 180)

    and

        sin (i * degvar * pi / 180)

    for degvar (measured in degrees) and i = 1, ..., npairs.


Options 

    cstub(str) specifies the stub for the names of the new cosine variables.
        This defaults to cos_, meaning that the cosines would be called
        cos_1, cos_2, cos_3 and so forth.

    sstub(str) specifies the stub for the names of the new sine variables.
        This defaults to sin_, meaning that the sines would be called sin_1,
        sin_2, sin_3 and so forth.

    npairs(#) specifies the number of pairs of variables.  This defaults to
        1.


Example 

    . fourier deg, np(3)


Author 

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