Re: LOGO-L> Playing with Logo

["Dr. Martin A. Burschka" <Martin.A.Burschka@hkn.de>]

Dale,
I did get the nice picture, but I seem to understand the relation to
interference less well than my 11-year old son Christoph, who just started
to experiment with mswlogo after playing around with microworlds.

He says the pictures are similar and that is enough ...
However, I wonder what features of your picture are due to the discreteness
of the pixels, and what to the nonlinear addition of amplitudes of
the partial waves, where blue can be imagined as the wavecrests and white as
valleys between. You make their superposition rule:
blue+blue=blue
white+blue=blue
white+white=white.
This is nonlinear.

I do like very much your idea to reproduce interference patterns
and wonder whether one can go beyond reproducing the picture to
reproduce the underlying mechanism as well without too much work.
Maybe one could model the amplitude of the partial wave of some
first antenna by color coding. Then the turtle wandering along the
wavefronts of the partial wave from the next antenna would read
the colorcoded sum of amplitudes previously dealt with antennas
and "add" its contribution.
I do not know enough about colorcoding and colorunder yet to
do this. Maybe if I ask Christoph ...
Martin.a.Burschka@hkn.de

Dale R. Reed wrote:

> I am sending this to you folks for three reasons.
>
> 1)  To demonstrate some fun "engineering" kind of things that I have
> been experimenting with involving cylindrical "waves."  The attached gif
> is a crude model of the broadside pattern of an array of 11 omni(well
> actually only half omni but I could of used 360 instead of 180 if I
> wanted to)sources.  Kinda-like 11 rocks dropped in the water or the top
> view of monopole antennas or whatever.  Hey with Logo we can construct
> our own worlds right?
>
> 2)  To send out into cyberspace, to many people for the first time, a
> gif file.
>
> 3)  To ask you why another fellow(my Mom's husband) that I already sent
> this to can not see it.  He is using a Mackintosh and AOL if that makes
> any difference.
>
> So will someone at least say that they received my pattern2.gif file and
> it looks OK?  Looks great when I send it to myself.  But I am kinda
> biased.
>
> I know it is not such great stuff but I did just take some photographs
> of water dropping in my birdbath and the resulting interference(standing
> waves) between the waves reflecting off the cylindrical rim and the
> waves from the source are kind interesting and if I can figure out how
> to...    Dale
>
> to pattern
> ht pd
> for [x -15 15 3 ] ~
>    [setpos (list :x 0) setheading 0 ~
>    setpc [0 0 0] bk 10 fd 10 setpc [0 0 250]  ~
> setheading 90 pole]
> gifsave "pattern2.gif
> end
>
> to pole
> for[rad 0 200 5][arc 180 :rad ]
> end
> --
> $  dale-reed@worldnet.att.net   Seattle, Washington U.S.A.  $
>
>   ------------------------------------------------------------------------
>  [Image]



---------------------------------------------------------------
Please post messages to the Logo forum to logo-l@gsn.org.  Mail
questions about the list administration to logofdn@gsn.org.  To
unsubscribe send    unsubscribe logo-l    to majordomo@gsn.org.