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<DIV><FONT face=Arial size=2>I've completed several builds but haven't produced
oscillation from a 2d (orthagonal) mesh.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Consider a non-optimised elementary build using a
2d array for the current sample, and a 2d array for the previous
sample.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>On each sample, all current samples are passed to
the previous sample array as such:</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>for (x=0; x < NX - 1; x++) {</FONT></DIV>
<DIV><FONT face=Arial size=2> for (y=0; y < NY - 1;
y++) {</FONT></DIV>
<DIV><FONT face=Arial size=2>
lastSample[x][y] = currentSample[x][y];</FONT></DIV>
<DIV><FONT face=Arial size=2> }</FONT></DIV>
<DIV><FONT face=Arial size=2>}</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>The computation for each sample then sums the four
adjacent lastSample[][] values for each junction and divides by two (Not as
efficient as using the & 1 flipflop, this form is only for
comprehension). Reflection at boundary cells is also
performed.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Without making any improvements, my experience with
other waveguide systems says that "there should be some oscillation if there is
reflection at the boundaries," i think i've attempted this four times over
the last few years, and even implementing the STK version variable for variable
(sans the filter which I assume is highpass and reflection) I'm
producing an exponential DC output.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Rurik.</FONT><FONT face=Arial size=2><BR><A
href="http://www.xoxos.net">http://www.xoxos.net</A></FONT></DIV></BODY></HTML>