How to remove a list from another one ?

[bruno29a]

Hi @tttpham , this was a challenge I looked into a couple of weeks ago.

I could not find a way in Knime nodes where it could remove only 1 instance of an element. Knime would remove all instances of the element as you found out.

I used a Python script to achieve this. The trick is to use list.remove() as it allows you to remove only 1 occurrence of it.

Check out this thread for more details and sample workflow:

Eliminate rows that values in a column that sums up to zero

Hi @ipazin @aworker , while we’re waiting for confirmation from @Angel_Villa , I thought that finding combinations for the positives was quite an interesting challenge. So, I put something together for this - note, it will also work if no combination is needed, which basically is a combination of 1 item, so it will still work. I made use of Python, since the Python script since I it has a library to generate all combinations of a given list. The workflow looks like this: [image] This is ac…