I am fascinated by board games. They provide immense fun, anyone can enjoy them, they are unpredictable and best of all they are great value for money. That is why whenever I get sometime I experiment with simulating games to know them better [read Why Monopoly board game is not as random as it appears]. So, out of curiosity I have created an excel sheet that can generate bingo / housie (housey) tickets – 24 of them at a time. To get new set of tickets you would hit F9 (recalculate).
Click here to download the bingo / housie ticket generator.
Note that these are Bingo UK / India / Australia variant I am talking about, not the US 5*5 type of bingo tickets.
Read on if you want to know how this is done:
According to Wikipedia:
A typical housie/bingo ticket .., contains fifteen numbers, arranged in nine columns by three rows. Each row contains five numbers and four blank spaces. Each column contains either one, two, or very rarely three, numbers:
* The first column contains numbers from 1 to 9,
* The second column numbers from 10 to 19,
* The third 20 to 29 and so on up until the last column, which contains numbers from 80 to 90.
I have removed number “90” from the list in order to reduce some complexity in generating the tickets.
The problem is now to “generate 15 random number between 1 to 89 and fill them in 15 random spots in a grid of 3 rows by 9 columns such that each row has exactly 5 numbers”
Now I could write a function in VBA to do this, but I wanted to do this only using formulas. So I started breaking the problem.
The first challenge is to select any random 5 cells in a 9 cell row
Once we select any random 5 cells in a 9 cell row, we will fill them with bingo numbers. Now, excel has a function to generate random numbers between 1 to 9 (=round(rand()*9,0)), but this is not good for us since each time we call this function we will get a random number between 1 to 9, where as we need a 5 random numbers without repetition between 1 to 9. The function is memoryless and could repeat numbers when called 5 times.
Instead we can list all the possible “5 cells with numbers and others are empty” combinations of a 9 cells region and select a random combination every time. There are essentially 9C5 i.e. 126 ways in which you can select any 5 cells out of 9 cells (without repetition of course).
So I listed all these combinations in a table and then randomly selected one of the combinations. You can see the first five such combinations in the image below:
Selecting any five cells out of nine cells
Now I created a 3*9 region and filled the cells with 1s or 0s, “1” when the cell in bingo ticket is supposed to have a value and “0” if the cell is empty as shown below:
Next challenge is to show random values in each cell
The trick here is that first column in our 3*9 bingo ticket has any number(s) from 1 to 9, second column has any number(s) from 10 to 19 …
Again, the challenge is the numbers should not repeat, otherwise we could simply use rand()*10, rand()*10+10, rand()*10+20 ... to generate the numbers.
This time it gets even more trickier because each column can have either no values, or 1 value or 2 values or 3 values.
The ticket generation logic now looks like:
- If the column has no values in it, then we will leave all the cells in that column of bingo ticket empty
- If the column has 1 value, we will generate any random number from that column’s range of possible values (1-9, 10-19,20-29,…80-89) and place it in the cell that is supposed to have a value and leave other cells empty.
- If the column has 2 values, we will generate 2 random numbers without repetition from that column’s range of possible values and place them in cells that are supposed to have them
- If the column has 3 values, we will generate 3 random numbers without repetition from that column’s range of possible values and place them in cells that are supposed to have them
As you can see, it is easy when the column has no or 1 value in it. But when the column has 2 or 3 I used the combinations trick described earlier.
First I created all 2 number combinations and 3 number combinations. Since the numbers on Bingo ticket are always sorted from top to bottom in a column, I just had to list down 45 combinations (10C2) for 2 numbers and 120 combinations (10C3) for 3 numbers.
The rest of the details are small enough that I can leave them to your imagination. So when the ticket is generated, it looks like this:
Remember to download housie / bingo ticket generator excel sheet and print your tickets at home. Just F9 to generate new set of tickets. Un-hide the rows from 43 if you want to see how this is done.
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40 Responses to “Lost Excel Functions”
Of all the functions, I think the BAHTTEXT function is the biggest "Why is this here???"
It's use would be limited to a very, very small demographic. A better function would have been a generic translate function where you pick the language (even if it was only the top 5 or something...)
Lost by whose definition? Some people use these functions(me). There are alot of words in English dictionary that aren't used.
This is a great post, especially because I love Lost. Thanks!
See the following blog post on Excel Semi-Pro which identifies the flaws with the DATEDIF function.
http://excelsemipro.com/2011/01/how-many-years-months-and-days-has-it-been/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+ExcelSemi-pro+%28Excel+Semi-Pro%29
Nice Post Hui. It is amazing what is in the program that you have never heard of. I typed in =d and looked at the functions. "Delta" popped out although it is documented, why would you ever use it vs. just comparing with an equal sign (=1=1).
I use Datedif at times. What will be nice is if alternatives to these "Lost" functions can also be posted with examples. That'll be a good reading and also deter users from using functions "soon to be made obsolete"
I don't think the intersect AND logic is very well documented:
=B1:B3 A2:C2 One intersection
=SUM(D9:F9 E8:F10) Two intersections
=SUM(D9:F9 E8:E10 F8:F10) No intersection --> #NULL! Not seen very often
There might be a OR logic lurking as well
//Ola
Interesting post! 😉
I found out that only "evaluate" isn't available in my excel 2007.
Great post, thanks Hui! 🙂
@Fred
Evaluate is a Excel 4 Macro Function and not a spreadsheet function
It can only be used in Named Ranges and VBA, not as a spreadsheet function.
@OlaSa
I forgot all about the 2 Operators you mention.
Daniel at Excel Hero has done a story about them at: http://www.excelhero.com/blog/2010/06/which-function-to-use---part-1.html
@Steve T
Yes, Delta and Gestep are odd functions and easily replaced with alternative logic.
These 2 functions may have uses in handling ranges and not just single cells.
I read somewhere not too long ago (at Daily Dose, possible) that BAHTTEXT is "rumoured" to be a self-interested joke by the MS Excel programmers: although this function would be at least equally useful for other currencies, they did the baht first because they're extremely partial to Thai takeaways and wanted to speed up the turnaround time
...and why isn't there a reverse ROMAN?
there is, just replace Roman with Arabic
=ROMAN(2023) is MMXXIII
=ARABIC("mmxxiii") is 2023
Hi Hui,
I think you have mis-defined the Result range name because you have made the name relative. The proper formula should have been
=EVALUATE($A$1).
NB: I use the technique in this post: http://www.jkp-ads.com/articles/chartanequation00.asp
Found this posting with some User Defined Functions and VBA for reversing Roman Numerals:
http://www.excelbanter.com/showthread.php?t=141566
Hi Hui - Thanks for the post - a little off the excel topic, but wondering what does "you"ll be the full bottle" mean? Have never heard this expression before. 🙂
@Tra
“you'll be the full bottle” is Aussie slang for "You'll know all about it"
@Jan Karel Pieterse
Thanx for the input
.
=Evaluate(A1) is ok as long as A1 is the active cell
It can create problems if it isn't.
.
Ideally it should be entered as =EVALUATE(SheetName!$A$1)
I have updated the post accordingly
Further info on DELTA:
Have 1 cell formatted to number (a1), and the other formatted to text (a2).
Type the number 1 into both cells
The formula:
=A1=A2
returns FALSE (number does not equal text)
formula:
=DELTA(A1,A2)
returns 1 (the equivalent of true). I see limited places where this would be useful, but wanted to point out that they do function differently.
In Excel2010
I just tried Delta with
2 2 =Delta(A2, B2) =1
'2 '2 =Delta(A3, B3) =1
'2 2 =Delta(A4, B4) =1
C C =Delta(A5, B5) =#Value!
Lines 3 & 4 should also give errors but don't ?
The formatting of the cells shouldn't affect the results as that is just for display
Great post.
Interesting that the roman function returns a #value! if you go any higher than 3999
@Chandoo Not trying to be a shameless self promoter (I just want to spread the Excel awesomeness) but I've found an obscure way to create a mouse-over effect in Excel using the Hyperlink() formula and some VBA. I've used this technique in some of my dashboards at work, and as an example of how it's useful, you could use it in the Grammy Bump chart to simply let users rollover a year instead of clicking on it. I talk about it in the latest post of my rarely updated blog which is linked on my name in this post. Or, here's the long and short of it:
.
=HYPERLINK(MyFunction(), "Mouseover me!")
.
Then in some module:
Public Function MyFunction()
Msgbox "hi!"
End Function
.
To test: place your mouse over the underlined portion of the cell. To make the entire-cell a mouse over target (not just the underlined portion), word wrap it. Also, if you want the function to change parts of your spreadsheet, you'll need to wrap the Hyperlink formula in an IFERROR (you'll see what I mean when you try it). Or you can read about it by clicking on my name, either way, make sure to have fun!
@Hui
Seems like DELTA has the advantage in being able to recognize "text as numbers". And yes, thanks for clarifying my statement about formatting. I should have been clearer in the fact that I just wanted to compare a text string with a number...in which case, maybe I should have just written:
=DELTA(1,"1") 'Results in 1
@Jordan... wow, that is a beautiful trick. I have not yet tested it, but seems like it has lots of potential. Let me play with the idea and may be write a follow-up article on this.
Btw, you are welcome to share information and links. That is the whole point of commenting. 🙂
Alright, i am no engineer, but a simple formula can also do what Delta does without having a whole function for it. That is like creating a function called Add (Syntax =Add(a1,a2) that results in the addition of A1+A2
This will do what delta does on numbers and textNumbers and its not rocket science or structural engineering 🙂 🙂
=VALUE(A1)=VALUE(A2) will also yield true/false
And if you need the result as a number =(VALUE(A3)=VALUE(A4))*1
@SteveT
You know, they invented this function you described in Excel. It is called SUM, not ADD 🙂
There are also functions PRODUCT, SUMPRODUCT and others. All of them simple definied, and it doesn't mean they aren't to be in Excel.
Of the under-used functions, I think Evaluate is probably the most useful.
The short UDF presented here:
http://newtonexcelbach.wordpress.com/2008/04/22/evaluate-function/
allows Excel to evaluate functions entered as text, without the need to create named ranges.
An application using this function can be downloaded here:
http://newtonexcelbach.wordpress.com/2008/03/25/section-properties-of-defined-shapes-spreadsheet/
thanks for this. I hope to use "convert" more frequently henceforth
@ruvelk and @Chandoo
I checked out the link you provided (ruvelk) and the explanation given of the intervals 'MD' 'YM' AND 'YD' provided above (Chandoo) and the information is not quite correct.
'MD' returns the number of days since the last completed month.
'YM' returns the number of months since the last completed year.
'YD' returns the number of days since the last completed year.
As far as I can see there is no flaw in the function just perhaps a misunderstanding of what is does.
eg
using the 'MD' interval
02/28/2010 to 01/11/2011
Last completed month = 12/28/2010
Number of days between 12/28/2010 and 01/11/2011 = 14
Using 03/01/2010 to 01/11/2011
Last completed month = 01/01/2011
Number of days between 01/01/2011 and 01/11/2011 = 10
Cheers
Andrew
@Andrew
I think we are talking about the same thing in different ways.
From the post:
"md" Days Excluding Years And Months Complete calendar days between the dates as if they were of the same month and same year.
so using your dates
28/2/10 to 11/1/11 will count 29, 30 and 31 as if they are in January and then the first 11 days in January = 14 days.
That is, it is counting the dates as if they are both in January, same year, and so there is 14 days between them.
Hi,
Can any one tell how to enter data into range of cells through a single cell without the help of VBA.
Regards
Chandra
@ Chandra
Can you be more specific?
@Chandra
If you type this into A1:
={1,2,3;4,5,6;7,8,9}
then select A1:C3 and use Control+Shift+Enter
You will get a 3x3 array in A1:C3
The formula in each cell in that range will be:
{={1,2,3;4,5,6;7,8,9}}
Commas separate columns. Semicolons separate rows,
This is of limited use since the cells in this array cannot be individually edited.
There is at least 1 Excel 4 macro that provides functionality that cannot (AFAIK) be replicated in later versions of Excel. GET.CHART.ITEM is used to get the exact coordinates of chart elements, including the coordinates of individual points in a line graph (or edge and corner cordinates of bars, or columns for those types of graphs). For example:
sngXPos = ExecuteExcel4Macro("get.chart.item(1,1, ""S2P" & lX & """)")
returns the X position of each point in series 2 of a line graph as you iterate from 1 To ActiveChart.SeriesCollection(2).Points.Count
Documentation file for Excel4 macros available at:
http://support.microsoft.com/kb/128185
Excel 2010 has incorporated most (but not all?) of this functionality as described here:
http://blogs.office.com/b/microsoft-excel/archive/2010/02/16/migrating-excel-4-macros-to-vba.aspx
Unfortunately, I don’t see Evaluate working in Excel 2010.
I have Microsoft Office Professional Plus 2010.
When I try it myself, or download the example file, I have #NAME?
result in the cell containing “=Result” formula.
The Evaluate function does work in Excel 2010 and 2013.
It is called from a VBA function, so maybe the problem is that macros are not enabled.
[…] To know how many months are left between TODAY() and date in A1, use = DATEDIF(TODAY(), A1, “m”). Related: How to use DATEDIF function. […]
[…] To know how many months are left between TODAY() and date in A1, use = DATEDIF(TODAY(), A1, “m”). Related: How to use DATEDIF function. […]
I once ran across an undocumented version of GETPIVOTDATA. The syntax was something like "GETPIVOTDATA($A$3, ...", where $A$# would reference the pivot table then you could concatenate text fields to select the specific data you were after. I found this useful as I could use an IF("condition", "place field text", ""). This way if the "condition" was met it would field data requested otherwise nothing was included. This worked well if nested condition were not available. Hope this is clear. I can't find the alternate syntax for GETPIVOTDATA anywhere. Does someone have it?
@Marty
Yes, GetPivotData is a usefull function but I believe it has been documented since 2007
https://support.office.com/en-us/article/GETPIVOTDATA-function-8c083b99-a922-4ca0-af5e-3af55960761f