Peter Ostry

I get one list with up to 128 elements, either 0 or 1. Then I get a second list of equal length and some elements went from 1 to 0 compared to the first list. I need the list positions of these elements.

I worked it out but wonder if one of you has a better,

more elegant solution than the attached patch:

I worked it out but wonder if one of you has a better,
more elegant solution than the attached patch:

finding-list-items-who-go-down-to-zero

Had a go using zl sub (with group to get it back into a list to work with) and filter:

I knew that my [uzi] was a foreign object in such a patch ;-)

Cannot get it to work. It shows the differences, not if an element did a 1 to 0 transition.

Charles Matthews wrote:
Had a go using zl sub

Nice, thanks!
I knew that my [uzi] was a foreign object in such a patch ;-)

Roman Thilenius wrote:
[vexpr ($f1==$f2)] ?

Cannot get it to work. It shows the differences, not if an element did a 1 to 0 transition.


Perfect, for 1—>0 transitions I need only 2 objects.

Thanks. What a difference if one knows what he does ...

Perfect, for 1—>0 transitions I need only 2 objects.
Thanks. What a difference if one knows what he does ...

This [vexpr] is great, I didn't know it.


it makes you a list with 1 at the positions where the inputs differ.

sorry i noticed that this wasnt your question - but too late.

it makes you a list with 1 at the positions where the inputs differ.
sorry i noticed that this wasnt your question - but too late.


Oh, this "knows what he does" was not an affront.

Your example pointed into the right direction. Obviously I needed a second example to get the idea.

Oh, this "knows what he does" was not an affront.
Your example pointed into the right direction. Obviously I needed a second example to get the idea.


Finding list items who go down to zero