If the first argument evaluates to TRUE (i.e. non-zero) the function will return the value of argument 2. Otherwise it will return the value of argument 3. Note that the type of arguments 2 and 3 must both be the same. No implicit type conversion will be performed on these arguments.
| Number | Type | Compulsory | Default | Description |
| 1 | real array | Yes | Test value | |
| 2 | real array | Yes | Result if test true | |
| 3 | real array | Yes | Result if test false |
Return type: real array
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