inside=atan

16 Jan 2003

      Dear Jonathan, Stone-Soupers, Fractinters, 

high magnifications of midgets with 'inside=atan' are highly
maxiter-sensitive, thus pretty difficult to manage. Is there a trick to
find the right value for maxiter? 
After a time consuming 'try ad error' periode, I found a way to get
appropriate maxiter=nnn values. Here are examples for 5 orders of maxiter.
Low mag's as 'startman' are easy to manage.. No value for maxiter below the
value for the first order leeds to a nice pic and the value for the first
order is no easy to find.. 

So it would be great to implement 'maxiter' to the evolver, and, if it's
possible, the 'proximity value for inside=epscross and fmod' (x-screen) too.. 
Try to change the values for maxiter and see the results.. 

startman           { ; time: 0h15' on a K7/600
                     ;  Version 2002 Patchlevel 3
  reset=2002 type=mandel passes=d
  center-mag=-0.538232/0.00782014/0.929296/1/-90/3.88578058618804789e-016
  params=0/0 float=y maxiter=8000 inside=atan symmetry=none
  periodicity=0 cyclerange=1/1
  colors=000<3>321421031642<51>taJubJvbK<2>ydLzeLydL<55>642531421<2>100000\
  001<56>Q_tQ`uR`v<2>SbyTczSby<61>000
  }

ataniter           { ; 1th order =12033
                     ; time: 0h26 on a K7/600
  reset=2002 type=mandel passes=d
  center-mag=-0.74896255201844790/+0.05435555412152205/7.927134e+011/1/-4.\
  99675937785410795/-0.0902709561915964742 params=0/0 float=y
  maxiter=12033 inside=atan logmap=yes symmetry=none periodicity=0
  colors=00000T<24>005004003<2>000000222<4>DCEFEGIGI<3>QORSQTUSW<4>c`ddaff\
  ch<3>lhnmjonkq<3>soutovtpw<3>wrywszwsz<2>xszxszwry<6>sousnurnt<3>okqnjpl\
  in<2>hejgciebgc`e<3>XVZWTXURV<5>HGIFEGDCD<3>444<39>ma1na1pb1<2>se1se1re1\
  <3>pc0ob0ma0<27>860750540430220000<34>00`00a00b00c00d00f<13>00U
  }

atannumb           { ; 2th order =24066
                     ; time: 1h26 on a K7/600
  reset=2002 type=mandel passes=d
  center-mag=-0.74896255201845010/+0.05435555412154748/2.119379e+012/0.999\
  9/-4.99548275077093162/-0.086997345982712887 params=0/0 float=y
  maxiter=24066 inside=atan outside=0 symmetry=none periodicity=0
  colors=000000<57>taJubJvbK<2>ydLzeLydL<55>642531421<2>100000001<56>Q_tQ`\
  uR`v<2>SbyTczSby<61>000
  }

atanfmod           { ; 3th order =36099
                     ; time: 0h46 on a K7/600
  reset=2002 type=mandel passes=d
  center-mag=-0.74896255201844790/+0.05435555412152205/6.97086e+011/1/-4.9\
  9687607663320321/-0.0914427337369515397 params=0/0 float=y
  maxiter=36099 inside=atan proximity=0.007 outside=fmod symmetry=none
  periodicity=0
  colors=000000<57>taJubJvbK<2>ydLzeLydL<55>642531421<2>100000001<56>Q_tQ`\
  uR`v<2>SbyTczSby<61>000
  }

atansumm           { ; 4th order =48132
                     ; time: 0h55 on a K7/600
  reset=2002 type=mandel passes=d
  center-mag=-0.74896255201844790/+0.05435555412152205/1.113368e+012/1/-4.\
  99670916040466828/-0.0879347820503879468 params=0/0 float=y
  maxiter=48132 inside=atan outside=summ logmap=yes symmetry=none
  periodicity=0
  colors=000A81<3>431320110000000<29>4hg4ji4kj<3>5qp6sq6ts<3>6zy<30>2IH2GF\
  2FE<3>198077065<2>011000001<34>HNqHOsIPt<2>JRyKRzJRy<34>349237226<2>0010\
  00110<29>hZ7j_7k`7<3>qe8sg8th8<3>zl9<33>C92
  }

atanatan           { ; 5th order =60165
                     ; time: 1h22 on a K7/600
  reset=2002 type=mandel passes=d
  center-mag=-0.74896255201845010/+0.05435555412154748/1.356392e+012/1/-4.\
  98344032497560363/-0.100894378737287849 params=0/0 float=y
  maxiter=60165 inside=atan outside=atan symmetry=none periodicity=0
  colors=000<58>ARtASuBSv<2>BUyBUzBUy<55>136125024<2>001000110<56>tr9us9vt\
  9<2>ywAzxAywA<61>000
  }

have fun,

Guy

Guy Marson

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