# Why do I need a Helper when I know the Item?

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Hi there,

Quantrix is logical und structured, and a cool thing. But there is one thing I do not understand, and I’m crossing the same thing in a lot of places, when doing SELECT statements, or in other places. I’m still not sure if my brain is twisted or if it is Quantrix ðŸ™‚

I compiled a very simple example to illustrate the point.

In a 3-dim matrix, I want to select one index on one dimension, sum over the second dimension, and do it for all elements in the third dimension.

Easy, as I know the item I want to slice – “S1” – by name.

I do not find a way to do this … not using the item name, not using the descriptor. Everybody is doing this using a helper. Why do I need to convert the address to content, and then search the cell content to get back the address of the cell?? This looks very inefficient to me.

Is there anybody out there who can fix my mind? Or show me how to solve the problem without a helper column (and yes, I know how I can do it if both matricies have the same structure and linked categories, I could sum over all “Sektor”-items, but that’s not what I want to do …

Gilbert Selected answer as best November 18, 2022

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Dear SAU,

I’m so sorry!!

For an unknown reason the “:” went away in my formulas, so I wrote “=” instead of “:=”, seems I was too tired last night!

Now, both formulas work!!

Thanks for all your explanations, I think these are very important techniques for me, correctly addressing items in other matrices based on items.

I’ve never seen this kind of stuff somewhere else, so this is extremly helpfull.

you definitvely won the prize!

Gilbert

Gilbert Answered question November 18, 2022