Excel公式中的动态参考

Question

I have the following array formula which works for what I want to do but I'm trying to change the formula when a user selects a value.

=INDEX($A$2:$B$70,SMALL(IF($A$2:$B$70=$A$121,ROW($A$2:$B$70)),ROW(1:1))-1,1)

It's used for a monthly report and the user will choose from a drop down the day of the month, eg 1,2,3 - 31.

So if the user selects 1 from the drop down menu I want the formula to use the above formula. If they select 2 for example I want the formula to move over a column so it would change to

=INDEX($A$2:$C$70,SMALL(IF($A$2:$C$70=$A$121,ROW($A$2:$C$70)),ROW(1:1))-1,1)

and so on moving over a column at a time.

It this possible at all or can it even be done without VBA?

I have an example of what I want done on the following link https://docs.google.com/spreadsheets/d/1MDOzoQxYLgW-UOyljZsMwSu8zyAB7O2k1V-bTNP5_F0/edit?usp=sharing

All the data is on the first tab called staff. Each employee has a row and the duty assigned under the corresponding day column. On the Roster tab it summarises each day. So what I am trying to get to happen is when you choose the day of the month (or preferably the actual date) the sheet changes to reflect the data.

At the moment the code I have working does for just Day 1 because the column references are coded into the formula. I was hoping to somehow choose 6 for example from the drop down and then the formula will map chosen day to the corresponding range in the raw data and update the formula and change the formula from Staff!$A$2:$B$68 to Staff!$A$2:$G$68 .

If the formula finds no more entries if shows #NUM! but I intended to use the function ISERROR() to replace #NUM! with "".

This is what I'm trying to achieve it if makes sense?

Answer 1

There are a few issues here/ You are returning the value from column A so the first range can be $A$2:$A$70 and that means you don't need the 1 to specify the column_num . The IF statement was covering A2:C70 when you really only want either B2:70 or C2:C70 depending on the 1 or 2.

Assuming that A122 has either a 1 or 2 in it then,

=INDEX($A$2:$A$70, SMALL(IF(INDEX($B$2:$C$70, 0, $A$122) = $A$121, ROW($1:$69)), ROW(1:1)))

Standard non-array alternative,

=INDEX($A$2:$A$70, SMALL(INDEX(ROW($1:$69)+(INDEX($B$2:$C$70, 0, $A$122) <> $A$121)*1E+99,, ), ROW(1:1)))