# isValid {#isvalid}

## Syntax {#syntax}

`isValid(X)`

## Arguments {#arguments}

**X** is a scalar/vector/matrix.

## Details {#details}

Determine if each element of X is null. Return true if at least one element is not null and false otherwise.

## Examples {#examples}

```
isValid(00i);
// output: false

isValid(1 NULL NULL 6 NULL 7);
// output: [true,false,false,true,false,true]

isValid(1/0);
// output: false
```

