# 位址和參照, 絕對和相對

## Cell references

An individual cell is fully identified by the sheet it belongs, the column identifier (letter) located along the top of the columns and a row identifier (number) found along the left-hand side of the spreadsheet. On spreadsheets read from left to right, the complete reference for the upper left cell of the sheet is Sheet.A1.

## Cell ranges

You can reference a set of cells by referencing them in ranges. Ranges can be a block of cells, entire set of columns and entire set of rows. The range A1:B2 is the first four cells in the upper left corner of the sheet. Range A:E contains all the cells of column A, B, C, D and E. Range 2:5 contains all the cells of row 2, 3, 4 and 5.

The reference to a cell of another document contains the fully qualified name of the other document between single quotes ('), then a hash #, then the name of the sheet of the other document, followed by a period and the name or reference of the cell.

For example, .

The path and document name URI must always be enclosed in single quotes. If the name contains single quotes (') they must be escaped using two single quotes (''). Only a sheet name may not be quoted if it does not contain a space or a character that would be an operator or the name would be pure numeric (for example, '123' must be quoted).

### 參照運算子

Example

:

A1:C108, A:D or 3:13

!

SUM(A1:B6!B5:C12)

~

Takes two references and returns a reference list, which is a concatenation of the left reference followed by the right reference. Double entries are referenced twice.

=COUNT(A1:B2~B2:C3) counts values of A1:B2 and B2:C3. Note that the cell B2 is counted twice.

=INDEX(A1:B2~C1:D2;2;1;2) selects cell C2, that is, the first cell of the second row, first column, of the second range (C1:D2) of the range list.

A reference list is not allowed inside an array expression.

## 絕對定址

Absolute referencing is the opposite of relative addressing. A dollar sign is placed before each letter and number in an absolute reference, for example, \$A\$1:\$B\$2.

LibreOffice can convert the current reference, in which the cursor is positioned in the input line, from relative to absolute and vice versa by pressing F4. If you start with a relative address such as A1, the first time you press this key combination, both row and column are set to absolute references (\$A\$1). The second time, only the row (A\$1), and the third time, only the column (\$A1). If you press the key combination once more, both column and row references are switched back to relative (A1)

LibreOffice Calc shows the references to a formula. If, for example, you click the formula =SUM(A1:C5;D15:D24) in a cell, the two referenced areas in the sheet will be highlighted in color. For example, the formula component "A1:C5" may be in blue and the cell range in question bordered in the same shade of blue. The next formula component "D15:D24" can be marked in red in the same way.

## 什麼時候使用相對參照，什麼時候使用絕對參照？

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