@Helmut_Kaufmann I don’t know your level with G’mic (I’m a beginner too, and not even a dev!) but it may seem a bit cryptic to you, so here’s a little “translation” for a few shortcuts used here :
:= launches the math parser. You could also use do_append={ u<0.1 }
e shortcut for echo
a short for append
u here it is a variable : random float between 0 and 1. there is also a command u(n) which gives you a float between 0 and n. Or u(n,N), which I think you can guess.
o a.k.a. output
i short for input, but you can also use nothing.
EDIT: forgot these ones below…
$> Is a variable that increments with each loop, starting from 0. $< does the same backwards.
${} is the output/status of the last command? (not so sure about this one if someone can confirm)
Also, the best command is h, short for help : gmic h a. Using autocompletion will give you a list of all commands starting with a.
Let’s hope I’m not wrong here 