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# 邏輯函式

This category contains the Logical functions.

### Handling non-logical arguments in logical functions

- Zero (0) is equivalent to FALSE and all other numbers are equivalent to TRUE.

- Empty cells and text in cells are ignored.

- A #VALUE error is raised if all arguments are ignored.

- A #VALUE error is raised if one argument is direct text (not text in a cell).

- Errors as argument lead to an error.

若要使用此指令...

Insert - Function - Category Logical

### ISNA

如果儲存格包含 #N/A (數值不存在) 的錯誤值則傳回 TRUE。

若發生錯誤，則函式會傳回 FALSE。

#### Syntax

ISNA(Value)

value 是要檢查的數值或表示式。

#### Example

=ISNA(D3) 傳回結果為 FALSE。

### ISERROR

Returns the value if the cell does not contain an error value, or the alternative value if it does.

This function is available since LibreOffice 4.0.

#### Syntax

IFERROR(Value; Alternate_value)

Value is the value or expression to be returned if it is not equal or results in an error.

Alternate_value is the value or expression to be returned if the expression or value of Value is equal or results in an error.

#### Example

=ISERROR(C8) (其中儲存格 C8 包含 =1/0) 傳回 TRUE，因為 1/0 是錯誤。

=ISERROR(C8) (其中儲存格 C8 包含 =1/0) 傳回 TRUE，因為 1/0 是錯誤。

## IFS

IFS is a multiple IF-function.

## SWITCH

SWITCH compares expression with value1 to valuen and returns the result belonging to the first value that equals expression. If there is no match and default_result is given, that will be returned.

## AND

如果所有引數是 TRUE 則傳回 TRUE。 如果其中一個元素是 FALSE，此函式會傳回 FALSE 值。

這些引數可能是本身傳回邏輯值的邏輯表示式 (TRUE, 1<5, 2+3=7, B8<10)，或包含邏輯值的陣列 (A1:C3)。

#### Syntax

AND(Logical 1 [; Logical 2 [; … [; Logical 255]]])

Logical 1; Logical 2; … ; Logical 255 are boolean values, references to cells or to cell ranges of logical values.

This function ignores any text or empty cell within a data range. If you suspect wrong results from this function, look for text in the data ranges. To highlight text contents in a data range, use the value highlighting feature.

#### Example

即將檢查條目 12<13、14>12 與 7<6 的邏輯值：

=AND(12<13;14>12;7<6) 傳回 FALSE。

=AND(FALSE();TRUE()) returns FALSE.

The array formula {=AND(B1:B10;C1:C10)} yields a one-dimensional value of TRUE when all components of B1:B10 and C1:C10 are TRUE. The array expression above does not produce the logical AND per element, and thus does not produce an array of logical values. To compute a logical AND of arrays per element use the * operator in array context. In the example, enter {=B1:B10*C1:C10}.

## FALSE

傳回邏輯值 FALSE。 FALSE() 函式不需要任何引數，而且會一直傳回邏輯值 FALSE。

#### Syntax

FALSE()

#### Example

=FALSE() 傳回 FALSE。

=NOT(FALSE()) 傳回 TRUE。

## IF

指定要執行的邏輯測試。

#### Syntax

IF(Test [; [ThenValue] [; [OtherwiseValue]]])

Test 是任意值或可為 TRUE 或 FALSE 的表示式。

若邏輯測試為 TRUE，則 (選擇性) 傳回 ThenValue。

若邏輯測試為 FALSE，則 (選擇性) 傳回 OtherwiseValue。

In the LibreOffice Calc functions, parameters marked as "optional" can be left out only when no parameter follows. For example, in a function with four parameters, where the last two parameters are marked as "optional", you can leave out parameter 4 or parameters 3 and 4, but you cannot leave out parameter 3 alone.

#### Example

=IF(A1>5;100;"too small") If the value in A1 is greater than 5, the value 100 is returned; otherwise, the text too small is returned.

=IF(A1>5;;"too small") If the value in A1 is greater than 5, the value 0 is returned because empty parameters are considered to be 0; otherwise, the text too small is returned.

=IF(A1>5;100;) If the value in A1 is less than 5, the value 0 is returned because the empty OtherwiseValue is interpreted as 0; otherwise 100 is returned.

## NOT

反轉邏輯值。

#### Syntax

NOT(LogicalValue)

LogicalValue 是要反轉的值。

#### Example

=NOT(A)。若 A=TRUE，則 NOT(A) 將評估 FALSE。

## OR

如果至少一個引數是 TRUE 則傳回 TRUE。 如果所有引數邏輯值均為 FALSE，此函式則傳回值 FALSE。

這些引數可能是本身傳回邏輯值的邏輯表示式 (TRUE, 1<5, 2+3=7, B8<10)，或包含邏輯值的陣列 (A1:C3)。

#### Syntax

OR(Logical 1 [; Logical 2 [; … [; Logical 255]]])

Logical 1; Logical 2; … ; Logical 255 are boolean values, references to cells or to cell ranges of logical values.

This function ignores any text or empty cell within a data range. If you suspect wrong results from this function, look for text in the data ranges. To highlight text contents in a data range, use the value highlighting feature.

#### Example

即將檢查條目 12<11、13>22 與 45=45 的邏輯值。

=OR(12<11;13>22;45=45) 傳回 TRUE。

=OR(FALSE();TRUE()) returns TRUE.

The array formula {=OR(B1:B10;C1:C10)} yields a one-dimensional value of FALSE when all components of B1:B10 and C1:C10 are FALSE. The array expression above does not produce the logical OR per element, and thus does not produce an array of logical values. To compute a logical OR of arrays per element use the + operator in array context. In the example, enter {=B1:B10+C1:C10}.

## TRUE

邏輯值設為 TRUE。 TRUE() 函式不需要任何引數，而且會一直傳回邏輯值 TRUE。

#### Syntax

TRUE()

#### Example

如果 A=TRUE 而 B=FALSE，下列範例出現：

=AND(A;B) 傳回 FALSE。

=OR(A;B) 傳回 TRUE。

=NOT(AND(A;B)) 傳回 TRUE。

## XOR

Returns true if an odd number of arguments evaluates to TRUE.

這些引數可能是本身傳回邏輯值的邏輯表示式 (TRUE, 1<5, 2+3=7, B8<10)，或包含邏輯值的陣列 (A1:C3)。

This function is available since LibreOffice 4.0.

#### Syntax

XOR(Logical 1 [; Logical 2 [; … [; Logical 255]]])

Logical 1; Logical 2; … ; Logical 255 are boolean values, references to cells or to cell ranges of logical values.

#### Example

=XOR(TRUE();TRUE()) returns FALSE

=XOR(TRUE();TRUE();TRUE()) returns TRUE

=XOR(FALSE();TRUE()) returns TRUE

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