Forum Discussion
Dynamic Arrays - Extend the last logical row value in a 2D array
As always a fabulous solution - actually 2. I'm using the Index as it is actually so fundamentally simple. Not sure why I couldn't get there but added more to my war chest. I now fully get the sequence inside the index to force the rows. And, of course, xmatch in reverse!! Why did I not think of that!!
ANd the error handling then if flags are missing. Very nice and very reusable.
I now get the scan & map combo. I see the use of the new enhanced byrow - I will carry on with the older version for a bit longer until all have it rolled out but it took a few seconds to figure out how it worked as never actually just seen it in use!
So now I fully get it. The map lets you do the logical test with the flag to leave only the last values in the resulting array and then you just do the usual scan function on that using the NAs to reset the rows. That will be a great addition to my library and I can now think of a number of places I could use that kind of combination
Both fab. I may doa performance test sometime to compare them but the usage is not high so won't make much difference. I have 7 sets of these so far and don't notice anything on the calc speed.
Many thanks to you again - and Peter for his input.
A couple of possibilities include:
=LET(
lastCols, BYROW(G6:N8,LAMBDA(r,XMATCH(1,r,,-1))),
lastVals, INDEX(G12:N14,SEQUENCE(ROWS(G12:N14)),lastCols),
IF(G3:N3<=INDEX(G3:N3,,lastCols),G12:N14,lastVals)
)
-OR-
=LET(
isFcst, BYROW(G6:N8*G3:N3,MAX)<G3:N3,
SCAN(0,MAP(isFcst,G12:N14,LAMBDA(f,v,LAMBDA(a,IF(f,a,v)))),LAMBDA(a,λ,λ(a)))
)
However, if any rows in the "flag" array don't contain a flag, additional steps would need to be taken, e.g. using IFNA to handle errors, which I've included in the attached file...
As always a fabulous solution - actually 2. I'm using the Index as it is actually so fundamentally simple. Not sure why I couldn't get there but added more to my war chest. I now fully get the sequence inside the index to force the rows. And, of course, xmatch in reverse!! Why did I not think of that!!
ANd the error handling then if flags are missing. Very nice and very reusable.
I now get the scan & map combo. I see the use of the new enhanced byrow - I will carry on with the older version for a bit longer until all have it rolled out but it took a few seconds to figure out how it worked as never actually just seen it in use!
So now I fully get it. The map lets you do the logical test with the flag to leave only the last values in the resulting array and then you just do the usual scan function on that using the NAs to reset the rows. That will be a great addition to my library and I can now think of a number of places I could use that kind of combination
Both fab. I may doa performance test sometime to compare them but the usage is not high so won't make much difference. I have 7 sets of these so far and don't notice anything on the calc speed.
Many thanks to you again - and Peter for his input.The new so called "platform upgrade" has broken this forum for me. It doesn't work properly on my cell phone (probably because it's too old/small), and I'm not about to buy a new phone just to keep up with a hobby, nor am I going to keep my laptop running all day just to monitor recent activity. The new threaded conversation view for replies/comments is also horrendous... nobody in their right mind would want to chase down every thread by clicking "Show More" over and over again to find the latest comment or to see all previous replies/suggested solutions. I don't think I'll be hanging out here much anymore. If you need any more help with your current or future projects, please feel free to email me direct. Take care.
David
Shame about that. I have come to value your contributions since you came on the scene. I certainly agree with you that, for the sort of extended technical discussions we have, there is one sort order of importance, namely chronological. Similarly the only filter of relevance is none.
It appears to be taking a step towards the LinkedIn platform which, in turn, appeared to borrow from Facebook. Suddenly everything was driven by likes (AI algorithms applying Artificial Stupidity to garble the logic of a technical discussion).
Mind you, I was surprised to read you manage to contribute using a phone. I need Excel open to test ideas as I go. Maybe part of a generation that lives and breaths by the power of the mouse 🙂.
Will you still use Chandoo?
Regards, Peter
