如何基于电子表格中另一个单元格中的值动态更改公式中的输入单元格？

Question

It is possible to dynamically change the input cell address in a formula based on the content in another cell?

Let's say I have a spreadsheet (excel or libreoffice) with these cell values:

A1: 10
A5:  9
C1:  5

Instead of hardcoding =A1-A5 , I would like to do something like this: =A1-A(C1) , that would be evaluated at run time to use cell A5 for the second input.

Answer 1

The non-volatile¹ solution would be the INDEX function .

'for Excel
=A1-INDEX(A:A, C1)
'for OpenOffice
=A1-INDEX(A$1:A$1048576; C1)

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¹ _{Volatile functions recalculate whenever anything in the entire workbook changes, not just when something that affects their outcome changes. Examples of volatile functions are INDIRECT , OFFSET , TODAY , NOW , RAND and RANDBETWEEN . Some sub-functions of the CELL and INFO worksheet functions will make them volatile as well.}

Answer 2

Use INDIRECT to take the value in C1 as a pointer to the row that you want in column A:-

=A1-INDIRECT("A"&C1)

(tested in Open Office and Excel 2010)

Answer 3

For this kind of dynamic reference, you need the INDIRECT function. It takes two arguments INDIRECT(reference,style)

reference , a text string containing a cell, a range of cells text or a named range

and style a boolean that if omitted or TRUE, indicates that reference is A1 style, and when FALSE, the reference is using the R1C1 style.

so in your case you can use

INDIRECT("A"&C1)

or

INDIRECT("R1C"&C1,FALSE)