# mustBeMember

Checks that value is member of specified array or issue error.

## Syntax

* mustBeMember(var, c)
* mustBeMember(var, c, argPosition)
* C++: void mustBeMember(const ArrayOfVector& args, const ArrayOf \&c, int argPosition)

## Input argument

* var - a variable.
* c - a variable.
* argPosition - a positive integer value: Position of input argument.

## Description

**mustBeMember** checks that value is member of an array or issue error.

## Example

```matlab
A = "red";
B = ["yellow","red","blue"];
mustBeMember(A,B)
```

## See also

[mustBeNonempty](mustbenonempty).

## History

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

## Author

Allan CORNET
