Enigma

c=c+a
d=c+@seed
pz=pz^2+d
`

pz=pz^2+c+a+@seed

class OM_ForumQuestion(common.ulb:DivergentFormula) {
public:
complex func Init(complex pz)
fpixel=pz
a=(0,0)
c=@seed
return pz
endfunc
private:
complex c
complex fpixel
complex a
complex func Iterate(complex pz)
float b=@p1
c=c-@p2*b
a=@p2+cotanh(pz/fpixel)
if @v==0
c=c+a
d=c+@seed
pz=pz^2+d
elseif @v==1
pz=pz^2+c+a+@seed
endif
return pz
endfunc
default:
title="Forum Question"
param v
caption="Variation"
enum="1""2"
endparam
param seed
caption="Seed"
default=(-0.5,0)
endparam
param p1
caption="Parameter 1"
default=0.7
endparam
param p2
caption="Parameter 2"
default=(0.01,0)
endparam
param p_power
visible=false
endparam
float param p_bailout
caption="Bailout"
default=128.0
exponential=true
endparam
}

Something is puzzling me. Here are two code snippets: ``` c=c+a d=c+@seed pz=pz^2+d ```` and ```` pz=pz^2+c+a+@seed ```` According to my understanding, these should produce the same result. They do not. Here's the formula: ```` class OM_ForumQuestion(common.ulb:DivergentFormula) { public: complex func Init(complex pz) fpixel=pz a=(0,0) c=@seed return pz endfunc private: complex c complex fpixel complex a complex func Iterate(complex pz) float b=@p1 c=c-@p2*b a=@p2+cotanh(pz/fpixel) if @v==0 c=c+a d=c+@seed pz=pz^2+d elseif @v==1 pz=pz^2+c+a+@seed endif return pz endfunc default: title="Forum Question" param v caption="Variation" enum="1""2" endparam param seed caption="Seed" default=(-0.5,0) endparam param p1 caption="Parameter 1" default=0.7 endparam param p2 caption="Parameter 2" default=(0.01,0) endparam param p_power visible=false endparam float param p_bailout caption="Bailout" default=128.0 exponential=true endparam } ```` and these are the two results: Variation 1:  Variation 2:  This is not a problem, because both variations are interesting, but I'd like to know why there is a difference. I'm guessing there is something glaringly obvious that I'm missing. Any suggestions?

The second version does not change c, which will be important in following iterations.

Ah, thank you Jim! It is indeed obvious now you point it out ]:)