While preparing a project plan, I had a strange problem. I wanted to highlight all the project tasks that fall with-in a certain date range. At the lowest level, the problem is like this:
There are 2 ranges of dates (a,b) and (x,y) and I want to know if they overlap (ie at least one date common between a,b and x,y)
The formula for testing such a thing seemed tricky at first. So I drew the conditions on paper to get clarity on what we should test. Evidently, there are 4 ways in dates (a,b) can overlap with dates (x,y) as shown below:
Now, we can test for the overlap condition using a formula like this:
If x is between a and b
or a is between x and y
then overlap
else do not overlap
As you know, there is no formula in excel like isbetween(). So we have to break it up to 2 conditions and an AND() Formula. Finally the formula becomes,
=if(or(and(x>=a,x<=b),and(a>=x,a<=y)),"Overlap","Do not overlap")
Now, it seemed like quite a big formula for testing if 2 ranges of dates overlap.
So, I continued my quest for even shorter formula.
After sometime, I realized that if we test for non-overlap instead of overlap, we can write a shorter formula.
Do not understand? Let me explain.
While there are 4 ways in which (a,b) can overlap with (x,y), there are only two ways in which (a,b) cannot overlap with (x,y). See this to understand:
Now, testing above conditions is very straight forward in excel.
the formula becomes, =if(or(y<a,b<x),"Do not overlap","Overlap")
The formula is much shorter and easy to maintain.
I was able to use it to test if a set of tasks in the project plan are running between given dates (for eg. next week). All is well in the end.
How do you test overlap conditions?
Do you ever have to test overlap conditions? What kind of formulas have you used? Please share your formula tips & tricks using comments.
11 Responses to “Use Alt+Enter to get multiple lines in a cell [spreadcheats]”
@Chandoo:
One more useful trick.......
In a column you have no. of data in rows and need to copy in the next row from the previous row, no need to go for the previous rows but entering Alt + down arrow, you will get the list of data, (in asending order), entered in the previous rows...
This is another great tip. I use this all the time to make sense of some *very* long formulas. As soon as the formula is debugged I remove the break.
Great tip Chandoo!
I use this feature often and it has even gotten the, "how did you do that" response.
Thanks!
@Ketan: Alt+down arrow is an awesome tip. I never knew it and now I am using it everyday.
@Jorge, Tony: Agree... 🙂
[...] Day 1: Insert Line Breaks in a Cell [...]
how can we merge a two sheet.
excellent idea. Chandoo you are genious
Hi chandoo,
I have used ctrl+enter to break the cell. But I did not get the result.
Please tell me how can i break the cell in multiple lines.
Hi, Ranveer,
Its not Ctrl+enter to break the cell, use Alt+Enter to make it happen.
hi Chandoo....
how we can use Alt+Enter in multiple rows at the same time please reply hurry i have lot of work and have no time and i m stuck in this. 🙁
Alt+J worked once 🙁
So I found another more reliable way:
=SUBSTITUTE(A2,CHAR(13),"")
Where A2 is the cell that contains the line breaks which the code for it is CHAR(13). It will replace it with whatever inside the ""