{smcl}
{* 30mar2004}{...}
{hline}
help for {hi:fourier}
{hline}

{title:Fourier series creation} 

{p 8 17 2}
{cmd:fourier}
{it:degvar}
[{cmd:if} {it:exp}] 
[{cmd:in} {it:range}] 
[{cmd:,} 
{cmdab:c:stub(}{it:str}{cmd:)}
{cmdab:s:stub(}{it:str}{cmd:)}
{cmdab:n:pairs(}{it:#}{cmd:)} 
]


{title:Description} 

{p 4 4 2}{cmd:fourier} creates new variables which are

{p 8 8 2}cos({it:i} * {it:degvar} * pi / 180)

{p 4 4 2}and

{p 8 8 2}sin ({it:i} * {it:degvar} * pi / 180)

{p 4 4 2}for {it:degvar} (measured in degrees) and {it:i} = 1, ..., {cmd:npairs}.


{title:Options} 

{p 4 8 2}
{cmd:cstub(}{it:str}{cmd:)} specifies the stub for the names of the new cosine 
variables. This defaults to {cmd:cos_}, meaning that the cosines would be 
called {cmd:cos_1}, {cmd:cos_2}, {cmd:cos_3} and so forth.

{p 4 8 2}
{cmd:sstub(}{it:str}{cmd:)} specifies the stub for the names of the new sine 
variables. This defaults to {cmd:sin_}, meaning that the sines would be 
called {cmd:sin_1}, {cmd:sin_2}, {cmd:sin_3} and so forth.

{p 4 8 2}
{cmd:npairs(}{it:#}{cmd:)} specifies the number of pairs of variables.
This defaults to 1.


{title:Example} 

{p 4 8 2}{cmd:. fourier deg, np(3)}


{title:Author} 

{p 4 4 2}Nicholas J. Cox, University of Durham, U.K.{break} 
	n.j.cox@durham.ac.uk