deduplicate() with more than one list

[dan-p3rry]

I have several lists that correspond to one another -- same number of points, etc. I remove the nth item from listA using deduplicate(). How can I then remove the nth item from listB and listC? I looked at the documentation for deduplicate_indexed(), but that doesn't seem to be the solution.

Perhaps a new function find_duplicate() that provides a list of indices for items to be deleted?

Thanks

[dan-p3rry]

I modified deduplicate() to make find_duplicate(). Code assumes that closed=true is not used with strings. I tested a bunch of possibilities but I don't claim to have tried EVERY possibility.

function find_duplicate(list, closed=false, eps=EPSILON) =
    assert(is_list(list)||is_string(list))
    let(
        l = len(list),
        end = l-(closed?0:1)
    )
    is_string(list) 
        ? [for (i=[0:1:l-2]) if (list[i] == list[(i+1)%l]) i]
        :
            eps==0 
                ? [for (i=[0:l-(closed?1:2)]) if (list[i] == list[(i+1)%l]) i] 
                : [for (i=[0:l-(closed?1:2)]) if (approx(list[i], list[(i+1)%l], eps)) i];

[adrianVmariano]

Can't you do something like ind=deduplicate_indexed(mydata, count(len(mydata)); to get the desired index list? That is the list of indices to be retained. Then you can use select to create the desired lists.

I wonder if it would make sense to have deduplicate_indexed have a default index set of count(len(list))