Hello Alexey,

I changed your notebook a bit, have a look at this piece of code:

ClearAll["Global`*"]

a = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
For[i = 2, i <= Length[a], i++,
 b = Select[a, # < 2 a[[i]] || # > 3 a[[i]] &];
 Print[i, ",", b];
 Print["####  ", a];
 a = Complement[a, b];
 Print["****  ", a]]

Basically you need to seperate your commands with a semicolon (;). In general one should try to avoid For-loops and this infamous Print command; better would be a more functional style and e.g. a Reap - Sow constuct for returning values as in my example above.

Regards -- Henrik

Hello, Henrik! Your questions help me to understand what i want (thanx) - need to change the base list inside the loop many times with some (not changing) operations. Another attempt - see attached file

Attachments:

Hello Podchufarov,

I would like to contribute, but I find the description hard to follow. Could you try to clarify? For example, you say that you take an element of a list (at random?) and use it to compute (by calling an existing function) a sublist of a list (of a different list or of the same one?).

Also, could you be more specific about the sizes of the lists? One could come up with something that works fine for a list of 10 elements, but that crashes on a list of 80K elements.

Thanks,

OL.