Home |
Search |
Today's Posts |
#1
|
|||
|
|||
Problem with "=rand()"
I wrote if staements for a random number generator, yet they dont work with the random number generator. All I am trying to do is make sure two of the same numbers do not show up. Without the rand. the formulas work fine. HELP!!!! -- comotoman ------------------------------------------------------------------------ comotoman's Profile: http://www.excelforum.com/member.php...o&userid=27292 View this thread: http://www.excelforum.com/showthread...hreadid=469176 |
#2
|
|||
|
|||
post your formulas so they can be evaluated. what is the expected result? what are you getting as a result? more info, please. -- swatsp0p ------------------------------------------------------------------------ swatsp0p's Profile: http://www.excelforum.com/member.php...o&userid=15101 View this thread: http://www.excelforum.com/showthread...hreadid=469176 |
#3
|
|||
|
|||
=rand()*(100-1)+1 Used in 5 cells. Works fine. =if(a1=b1,"Repeat","Good") cell 1 =if(a1=c1,"Repeat","Good") cell 2 and so on, used to see if any of the first 5 cells repeats itself. The above if formulas work when i test the cells without Rand, but do not work when i enter the rand formula from above. -- comotoman ------------------------------------------------------------------------ comotoman's Profile: http://www.excelforum.com/member.php...o&userid=27292 View this thread: http://www.excelforum.com/showthread...hreadid=469176 |
#4
|
|||
|
|||
All seems to work when I use your formulas. There are ten possible combinations to check for repeats (note that RAND() recalculates with every change to the sheet) If your RAND formula (=rand()*(100-1)+1) is in cells A1:E1 and in A2:A11 you have the following formulas: =IF(A1=B1,"Repeat","Good") =IF(A1=C1,"Repeat","Good") =IF(A1=D1,"Repeat","Good") =IF(A1=E1,"Repeat","Good") =IF(B1=C1,"Repeat","Good") =IF(B1=D1,"Repeat","Good") =IF(B1=E1,"Repeat","Good") =IF(C1=D1,"Repeat","Good") =IF(C1=E1,"Repeat","Good") =IF(D1=E1,"Repeat","Good") Each cell in this range will return "Good" (as there are no duplicates), plus the odds of a repeat are staggering... unless you use the INT function =INT(rand()*(100-1)+1). What is failing for you? -- swatsp0p ------------------------------------------------------------------------ swatsp0p's Profile: http://www.excelforum.com/member.php...o&userid=15101 View this thread: http://www.excelforum.com/showthread...hreadid=469176 |
#5
|
|||
|
|||
It would seem that it does not recalculate after each change. By reducing the range to 10, and using whole numbers, they duplicate more often. In doing this, the results never change, and this is the root of my problem. -- comotoman ------------------------------------------------------------------------ comotoman's Profile: http://www.excelforum.com/member.php...o&userid=27292 View this thread: http://www.excelforum.com/showthread...hreadid=469176 |
#6
|
|||
|
|||
Are you saying that instead of =rand()*(100-1)+1 your formula is actually =rand()*(10-1)+1? Do you have calculation set to automatic (ToolsOptionsCalculation tab)? Pressing F9 should cause your sheet to recalc. and generate a new set of random numbers in your range. Are you trying to make it so that no duplicates EVER happen or simply to flag when they do? -- swatsp0p ------------------------------------------------------------------------ swatsp0p's Profile: http://www.excelforum.com/member.php...o&userid=15101 View this thread: http://www.excelforum.com/showthread...hreadid=469176 |
#7
|
|||
|
|||
It's hard to tell what you're doing since you didn't include the
formulae, but this might be of help: http://www.mcgimpsey.com/excel/randint.html In article , comotoman wrote: I wrote if staements for a random number generator, yet they dont work with the random number generator. All I am trying to do is make sure two of the same numbers do not show up. Without the rand. the formulas work fine. HELP!!!! |
#8
|
|||
|
|||
I just reduced the rand size to increase the duplication, and i would like to show either no duplicates ever, or flag me when there is a duplicate. Currently Im just trying to flag. -- comotoman ------------------------------------------------------------------------ comotoman's Profile: http://www.excelforum.com/member.php...o&userid=27292 View this thread: http://www.excelforum.com/showthread...hreadid=469176 |
#9
|
|||
|
|||
The formulas are as posted above, all I really need to do is flag if [=rand()*(100-1)+1] in 5 cells has any duplicates. -- comotoman ------------------------------------------------------------------------ comotoman's Profile: http://www.excelforum.com/member.php...o&userid=27292 View this thread: http://www.excelforum.com/showthread...hreadid=469176 |
#10
|
|||
|
|||
Anybody have any ideas? -- comotoman ------------------------------------------------------------------------ comotoman's Profile: http://www.excelforum.com/member.php...o&userid=27292 View this thread: http://www.excelforum.com/showthread...hreadid=469176 |
#11
|
|||
|
|||
comotoman -
Anybody have any ideas? < Please be more specific. The RAND worksheet function returns numbers with 15 significant digits. Your formula "=rand()*(100-1)+1" will also have 15 significant digits. If you examine a sequence of several hundred or several thousand or several hundred thousand, you will not see any duplicates. The above if formulas work when i test the cells without Rand, but do not work when i enter the rand formula from above. < What do you mean by "do not work"? It would seem that it does not recalculate after each change. < After each change of what? That is, what are you changing? - Mike www.mikemiddleton.com |
#12
|
|||
|
|||
I hope this may help explain my problem. (=rand()*(10-1)+1) are in cells A1:E1 and in A2:A11 the following formulas: =IF(A1=B1,"Repeat","Good") =IF(A1=C1,"Repeat","Good") =IF(A1=D1,"Repeat","Good") =IF(A1=E1,"Repeat","Good") =IF(B1=C1,"Repeat","Good") =IF(B1=D1,"Repeat","Good") =IF(B1=E1,"Repeat","Good") =IF(C1=D1,"Repeat","Good") =IF(C1=E1,"Repeat","Good") =IF(D1=E1,"Repeat","Good") (I have changed the original formula from 100 to 10, thus allowing more duplicates as to test the sheet.) cells A1:E1 are formated as "number" with "no decimal places". When I update (F9) or change the sheet (type a #1 in a unassociated cell, pressing enter) to change the random #'s in cells A:1 thru E:1, and 2 duplicate whole numbers appear, the formulas in A2:A11 do not show "repeat", instead the results still show "good". -- comotoman ------------------------------------------------------------------------ comotoman's Profile: http://www.excelforum.com/member.php...o&userid=27292 View this thread: http://www.excelforum.com/showthread...hreadid=469176 |
#13
|
|||
|
|||
Here is your problem... even though you have formatted as "no decimal places", the result of the RAND -still- has 15 decimals, you simply are suppressing the displaying of those digits.. As I indicated in an earlier post Each cell in this range will return "Good" (as there are no duplicates), plus the odds of a repeat are staggering... unless you use the INT function =INT(rand()*(10-1)+1). PLEASE try my suggestion: =INT(rand()*(10-1)+1) -- swatsp0p ------------------------------------------------------------------------ swatsp0p's Profile: http://www.excelforum.com/member.php...o&userid=15101 View this thread: http://www.excelforum.com/showthread...hreadid=469176 |
#14
|
|||
|
|||
That will teach me to be more specific with my questions, it works like a charm. Thanks -- comotoman ------------------------------------------------------------------------ comotoman's Profile: http://www.excelforum.com/member.php...o&userid=27292 View this thread: http://www.excelforum.com/showthread...hreadid=469176 |
#15
|
|||
|
|||
I am so glad we got this all sorted out. Details are vital to getting the correct answer to a problem. Cheers! -- swatsp0p ------------------------------------------------------------------------ swatsp0p's Profile: http://www.excelforum.com/member.php...o&userid=15101 View this thread: http://www.excelforum.com/showthread...hreadid=469176 |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Excel Display Problem | Excel Discussion (Misc queries) | |||
autofilter problem | Excel Worksheet Functions | |||
Problem with Array Formulas and ISNUMBER | Excel Worksheet Functions | |||
Freeze Pane problem in shared workbooks | Excel Discussion (Misc queries) | |||
Row Autofit problem Excel 2003 | Excel Discussion (Misc queries) |