Since it was written as an example for an o-scope
I would guess it is time. O-scopes are a time period
driven device.

Ken


mick wrote:

> Whats the t stand for?
> mick
>
> Ken <tyl### [at] pacbellnet> wrote in article
> <35F2687A.9409128B@pacbell.net>...
> > Here is a string that generates a figure eight plucked from
> > an old o-scope manual.
> >
> > The equation:
> > x=sin(b t+c);y=sin t   {0,2p}   {b:2}   {c:p}
> >
> > The ; separate the parametric equations
> > The first {} with the comma is the range.
> > The second and third {} with the colon set variables b and c
> > p = pi
> >
> > How would this be plugged into Peters code ?
> >
> > Ken
> >
> > mick wrote:
> >
> > > Great little utility Peter
> > >
> > > Took the liberty of abusing it
> > >
> > > When I was a kid I remember feeding two signal generators into an
> > > oscilloscope
> > >
> > > So I modified yor code to do that
> > >
> > > Add
> > > #declare coeff2_X = ?; // where ? is any number multiples of coeff_X
> work
> > > best
> > > and add
> > >
> > > + sin(2*pi*(dummy+phase_X)*coeff2_X),
> > >
> > > to
> > >
> > > <sin(2*pi*(dummy+phase_X)*coeff_X)
> > >
> > > to get
> > >
> > > <sin(2*pi*(dummy+phase_X)*coeff_X) +
> sin(2*pi*(dummy+phase_X)*coeff2_X),
> > >
> > > Gives some amazing patterns
> > >
> > > Have Fun
> > >
> > > Mick Hazelgrove
> >
> >
> >
> >

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