# mustBeLogicalScalar

Checks that value is logical scalar or raise an error.

## Syntax

* mustBeLogicalScalar(var)
* mustBeLogicalScalar(var, argPosition)
* C++: void mustBeLogicalScalar(const ArrayOfVector& args, int argPosition)

## Input argument

* var - a variable: all supported types and classes that implement islogical, isscalar methods.
* argPosition - a positive integer value: Position of input argument.

## Description

mustBeLogicalScalar checks that value is logical scalar or raise an error.

## Example

```matlab
mustBeLogicalScalar(true)
mustBeLogicalScalar([])
mustBeLogicalScalar([true false])
```

## See also

[isscalar](../elementary_functions/isscalar), [islogical](../types/islogical).

## History

| Version | Description     |
| ------- | --------------- |
| 1.0.0   | initial version |

## Author

Allan CORNET
