Automatic numbering in the unsequence's row for grouping

[Onnyhendra]

Can any one please help to make a excel's formula for the automatic numbering instead of manual as below sample

description automatic numbering w1 1 w1 1 w2 1 w3 1 w1 2 w3 1 w2 1 w3 2 w3 2 w3 3 w2 2 w2 2 w3 3 w1 2 <colgroup><col><col></colgroup><tbody> </tbody> For the support and attention Thank You...

<colgroup><col><col></colgroup><tbody>
</tbody>

 

[AOB]

You're more likely to get a reply if you provide a logic or pattern to what you're looking for?

There is no discernible pattern to the sample you've provided?

What determines whether the "automatic numbering" should be 1, 2, 3, x...

 

[Onnyhendra]

Dear AOB, Thanks for the suggestion,

I don't how to explain more, basically as below:

		Desire
No.	description	automatic numbering
1	w1	1
2	w1	1
3	w2	1
4	w3	1
5	w1	2
6	w3	1
7	w2	1
8	w3	2
9	w3	2
10	w3	3
11	w2	2
12	w2	2
13	w3	3
14	w1	2
Quantity
w1=4	in every 2 times will be automatic number (start in 1)
w2=4	in every 2 times will be automatic number (start in 1)
w3=6	in every 2 times will be automatic number (start in 1)

<colgroup><col><col><col><col span="2"></colgroup><tbody>
</tbody>

Thank you so much.

 

[njimack]

B1: =1
B2: (confirm with ctrl+shift+enter,then copy down as far as necessary) =MAX(IF(A$1:A1=A2,B$1:B1))+IF(MOD(COUNTIF(A$1:A1,A2),2)=0,1,0)

 

[AOB]

So if I get this right, you want the "automatic number" to effectively be a count of the description, but only to increment (1>2, 2>3 etc.) on every second instance of that description?

Assuming "description" is in column A and "automatic number" is in column B, and the first row of data is in row 2

This formula in cell B2 :

=ROUNDUP(COUNTIF($A$2:$A2,$A2)/2,0)

...dragged to the end of the data should produce he desired result

(Note the anchoring - enter the formula precisely as above or it won't work)

 

[Rick Rothstein]

Quantity
w1=4	in every 2 times will be automatic number (start in 1)
w2=4	in every 2 times will be automatic number (start in 1)
w3=6	in every 2 times will be automatic number (start in 1)

<tbody>
</tbody>

You had left the above out of your original post (it tells us the logic behind your numbers).

Now, if I understand your requirement correctly, this normally entered formula should work for you...

=ROUNDDOWN(COUNTIF(A$1:A1,A1)/2,0)+(MOD(COUNTIF(A$1:A1,A1),2)=1)

 

[Onnyhendra]

Great Sir,

Thanks so much for AOB, Neil and Mr. Rick.
It's working perfect for the last.

Regards,