Preface
Due to the work requirements of a good friend, it is necessary to realize the permutation and combination of three kinds of data on Excel. If using a programming language, it is nothing more than nested loops. However, it has not been implemented in Excel. After the implementation, I found it quite interesting and hereby record it for the convenience of follow-up. Engineer personnel can facilitate this requirement.
Effect preview
Things to know about Excel functions
COUNTA()
is used to count the number of non-empty cells in a column. COUNT() is commonly used, but it cannot handle statistics of non-numeric columns. This article is used to calculate the maximum value of a set.
For example, COUNTA(A:A), the rendering is subtracted by 1, so it is displayed as 3.
INDEX()
returns a specific cell value or reference in a given cell range. This article is used for assignment.
For example, INDEX(A:A, 2), the returned result is Shanghai.
ROW()
returns a referenced row number, which is used in this article to implement traversal.
MOD()
returns the remainder of the division of two numbers, which is used in this article to implement a recursive loop.
Implementation instructions
As shown in the results of the renderings
Function formula in column J: INDEX(A:A,(ROW(J2)-2)/($F$2 * $G$2) + 2) .
| step | official | illustrate |
|---|---|---|
| 0 | ROW(J2)-2 | Because we need to filter out the header and start from 0, we need - 2 |
| 1 | $F$2 * $G$2 | That is, the number of combinations of product name and accessories, that is, the number of cycles, 2 * 5 |
| 2 | (ROW(J2)-2) / ($F$2 * $G$2) | Take integers for classification and summarization |
| 3 | INDEX(A:A, (ROW(J2)-2) / ($F$2 * $G$2) + 2） | Within the range of column A, + 2 is to ensure the correct value to filter out meaningless data, that is, A0, A1 |
In this way, the data in column I will successfully traverse 30 valid data (3 * 2 * 10) as shown below
在 K列的函数公式：=INDEX(B:B,MOD((ROW($J2)-2) / $G$2,$F$2) + 2)
在 L列的函数公式：=INDEX(C:C,MOD(ROW($J2)-2)),$G$2) + 2)
The above formulas are generally similar. It should be noted that column K is / $G$2, and column L does not have / (which can be understood as / 1). This is the inconsistency in the corresponding number of loops, thus achieving nested loops in the program.
idea
It's a very interesting experience. You need to know the number of loops to prevent exceptions, and you need to use the $ symbol reasonably to ensure that horizontal expansion is supported. It is very simple from the perspective of implementation complexity, but compared to using a program to implement it, the former has a greater sense of accomplishment.