Today’s homework is inspired from an email I got from Simran,
I have a mathematical problem, I do not know if it can be solved using excel. So, the question is what is the probability of selecting a mutant cell if the percentage of mutant in the whole population is 0.01 and each cell is dividing 4 times per day,meaning at 2 raised to the power of 4 and the population is say 100,000 and is growing exponentially for 10 days and every day you are selecting, say 1/16 th of the population for the next growth? So, after 10 days, what are the chances that I have different mutants and not clone of the same mutant?
Let me break down the problem for you.
We have a starting population of 100,000 cells (not the A1 kind)- Out of which 1% are Mutant cells
- Each cell becomes 16 cells by end of day
- Naturally, there will be 1 new mutant cell for every 100 new cells produced in such a way.
- At the end of day, we just pick 1/16th of the cells and go for the next day
We have a starting population of 100,000 cells (not the A1 kind)At the end of 10 days, what portion of total cells are,
- Normal (ie no mutation at all)?
- Clones of original Mutant cells?
- New Mutants?
What you need to do?
Simple. Make an Excel Model to simulate the cell mutation. Your objective is to find answers to above questions thru that model. (Obviously, we can find answers without modeling, but I want to see how we can creatively use Excel to solve a problem like this.)
Once you find a solution,
- Upload your workbook to skydrive or a public website
- You can also email to me at chandoo.d @ gmail.com with subject “mutant ninja turtle”
- Share the link thru comments along with a description of your solution
What if you don’t find mutant cells exciting?
Here is a mutant teddy bear. Enjoy it. (source)
More Excel Homework
If you enjoy excel challenges, then you will love Excel Homework page. It has a bunch of challenging exercises for you.
All the best. Go muse over the mutation problem.
21 Responses to “How to Filter Odd or Even Rows only? [Quick Tips]”
Infact, instead of using =ISEVEN(B3), how about to use =ISEVEN(ROW())
So it takes away any chance of wrong referencing.
I like Daily Dose of Excel
I like it.
Just a heads up, you do need to have the Analysis ToolPak add-in activated to use the ISEVEN / ISODD functions. An alternative to ISEVEN would be:
=MOD(ROW(),2)=0
rather than use a formula, couldn't you enter "true" in first cell and "false" in the second and drag it down and than filter on true or false.
Just for clarification, is Ashish looking to filter by even or odd Characters or rows?
so many functions to learn!
Nice support by chandoo and team as a helpdesk. Give us more to learn and make us awesome. Always be helpful.......
In case you want to delete instead of filter,
IF your data is in Sheet1 column A
Put this in Sheet2 column A and drag down
=OFFSET(Sheet1!A$1,(ROWS($1:1)-1)*2,,)
(This is to delete even rows)
To delete odd rows :
=OFFSET(Sheet1!A$2,(ROWS($1:1)-1)*2,,)
If your numbered cells did not correspond to rows, the answer would be even simpler:
=MOD([cell address],2), then filter by 0 to see evens or 1 to see odds.
I sometimes do this using an even simpler method. I add a new column called "Sign" and put the value of 1 in the first row, say cell C2 if C1 contains the header. Then in C3 I put the formula =-1 * C2, which I copy and paste into the rest of the rows (so C4 has =-1 * C3 and so forth). Now I can just apply a filter and pick either +1 or -1 to see half the rows.
Another way, which works if I want three possibilities: in C2 I put the value 1, in C3 I put the value 2, in C4 I put the value 3, then in C5 I put the formula =C2 then I copy C5 and paste into all the remaining rows (so C6 gets =C3, C7 gets =C4, etc.). Now I can apply a filter and pick the value 1, 2, or 3 to see a third of the rows.
Extending this approach to more than 3 cases is left as an exercise for the reader.
Another way =MOD(ROW();2). In this case, must to choose betwen 1 and 0.
[...] How to Filter Even or Odd rows only [...]
very different style Odd or Even Rows very easy way to visit this site
http://www.handycss.com/tips/odd-or-even-rows/
Thanks for the tip, it worked like magic, saved having to delete row by row in my database.
Thanks!
Thankssssssssssssssss
Hi Chandoo- First of all thanks for the trick. It helped me a lot. Here I have one more challenge. Having filtered the data based on odd. I want to paste data in another sheet adjacent to it. How can I do that?
For Example-
A 1 odd
B 3 odd
C 4 even
D 6 even
I have fileted the above data for odd and want to copy the "This is odd number" text in adjacent/next sheet here. How can I do that. After doing this my data should look like this
A 1 odd This is odd number
B 3 odd This is odd number
C 4 even
D 6 even
Hi! Could you please help me find a formula to filter by language?
Thank you!
Chandoo SIR,
I HAVE A DATA IN EXCEL ROWS LIKE BELOW IS THERE ANY FORMULA OR A WAY WHERE I CAN INSTRUCT I CAN MAKE CHANGES , MEANS I WANT TO WRITE ONLY , THE FIG IS FRESH, BUT IN BELOW ROW IT WILL AUTOMATICALLY TAKE THE SOME WORDS FROM FIGS AND MAKE IN PLURAL FORM , WHILE USING '' ARE'' LIKE BELOW
The fig is fresh - row 1
Figs are fresh - row 2
The Pomegranate is red - row 3
Pomegranates are red - row 4
=IF(EVEN(A1)=A1,"EVEN - do something","ODD - do something else") with iferron (for blank Cell)