>>>>> "Daniel" == Daniel Lakeland <dlakelan at street-artists.org> writes:
Daniel> On Thu, Jan 04, 2007 at 05:14:25PM -0500, Raymond Toy wrote:
>> Daniel Lakeland wrote:
>> > I'm confused by the documentation for the fourier package. In the
>> > following:
>> >
>> > Function: fourier (f, x, p)
>> >
>> > Returns a list of the Fourier coefficients of f(x) defined on the interval [-%pi, %pi].
>> >
>> > what is the role of "p" ???
>> From a brief look at the code, it seems that p is used to indicate the
>> interval [-p, p]. I think the documentation is wrong about the interval
>> being -%pi to %pi.
Daniel> That's what I suspected from playing around with it. Perhaps someone
Daniel> else can confirm, and if so, we can change the docs.
I think it's also unfortunate the fourexpand and friends need you to
specify p again. I would have expected fourier to leave enough info
around to know the interval.
I was getting confused for a while when I was doing
e:fourier(f,x,10); plot2d(fourexpand(e,x,1,5),[x,-10,10]).
But maybe the intent is that you should be able to compute the Fourier
series with a period of p, but expand the series with a different
period.
Ray