Re: [Fractint] Diode Fractal

2 Aug 2009

      I  don't mind if you scrabble the code a little , I included all of the
comments
 to inform those interested  , about  how I derived the appropriate formula
.
   At  this  stage I  haven't  investigated what the iteration represents ,
except
 for the purely real axis .

   It is  Winfract 18.21 , for now.
   Because of a few limitations with this I also installed the most recent
 DOS  version  of  Fracint.

----- Original Message ----- 
From: "Gerald K. Dobiasovsky" <gerald.dob@aon.at>
To: "Fractint and General Fractals Discussion"
<fractint@mailman.xmission.com>
Sent: Friday, July 17, 2009 12:36 PM
Subject: Re: [Fractint] Diode Fractal
...
sciwise,
do you really use Winfract 18.21? It's very old (anything before version
19.6 is more or less "stone age territory").
There's an updated version here (I can't reach www.fractint.org at the
moment):
http://twegner.dyndns.org/fractint/ftp/current/windows/winfract-20.04p09.zip
...
Cut and pasted from Winfract 20.04patch9 Help:
--------------------------------------------------------------------------
-------------------------------
...
This release of Winfract is essentially the same as the version 18.2 but
with the following enhancements:
- All fractal types from Fractint 20.4 (with the exception of the
'julia_inverse' fractal type, which
  requires some extra logic we haven't yet added to Winfract) have been
incorporated into this version of
  Winfract.
- The File Open, File SaveAs, and File Print options now use the new
Windows-style "common dialog boxes",
  with the extra capabilities provided by those routines. This is
particularly handy if you're using
  Windows-for-Workgroups or Windows NT, 2000, XP with their networking
options.
- The fractal history feature of FFD has been implemented and uses the h
key to move back in history and
  the H key to move forward in history.
--------------------------------------------------------------------------

...
I hope you excuse me from scrambling your code (not all of it was
necessary, but is the result of trying
...
to get it to display something on my machine.
Note that the inclusion of formulas in .par sets works only from version
19.6 on,
if my memory serves me right.
Regards,
Gerald
---------------- .PAR SET BELOW ------------------------------------
Diode {
 reset=2004 type=formula formulafile=fractint.frm
 formulaname=LnDioGH
 corners=-0.16588419/0.25978091/-0.15031315/0.1691023 float=y
 maxiter=512 logmap=yes periodicity=no
 colors=00000j0j0jj0j00j0j0jjkkkkrkdmwW000W0WW000WW0W0WWFNF<5>zNFFVF<5>zV\
 FFbF<5>zbFFjF<5>zjFFrF<5>zrFFzF<5>zzFFFN<5>zFNFNN<5>zNNFVN<5>zVNFbN<5>zb\
 NFjN<5>zjNFrN<5>zrNFzN<5>zzNFFV<5>zFVFNV<5>zNVFVV<5>zVVFbV<5>zbVFjV<5>zj\
 VFrV<5>zrVFzV<5>zzVFFb<5>zFbFNb<5>zNbFVb<5>zVbFbb<5>zbbFjb<5>zjbFrb<5>zr\
 bFzb<5>zzbFFj<5>zFjFNj<5>zNjFVj<5>zVjFbj<5>zbjFjj<5>zjjFrj<4>rrjzywccdWW\
 Wz000z0zz000zz0z0zzzzz
 }
frm:LnDioGH{
;
; Complex Voltage - Complex Current
;       Diode Characteristics .
;
;      for 1N4148 silicon type .
;           Level 1 model .
;
;           at 25 degrees C
;
 Pd = 0.0000000000001
 Gm = 0.00000000000094
Ids = 0.00000000252
 Rs = 0.968
  n = 1.752
 Vt = 0.025
  u = Gm*n*Rs*Vt+n*Vt
 Pt = n*Vt
 vr = Ids*Rs
  x = 0.1
  x = x-((u*x*log(x)+vr*x*x-(Pixel+vr)*x)/(vr*x+u))
  z = 0-(Pt*log(x)-Pixel)/Rs:
  u = z
  x = x-((u*x*log(x)+vr*x*x-(Pixel+vr)*x)/(vr*x+u))
  z = 0-(Pt*log(x)-Pixel)/Rs
|u-z| > Pd
}
-------------- END OF .PAR SET ------------------------------------------
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