isvarname (MATLAB Functions)

Determine if item is a valid variable name

Syntax

```
tf = isvarname('str')
isvarname str
```

Description

tf = isvarname 'str' returns logical true (1) if the string, str, is a valid MATLAB variable name and logical false (0) otherwise. A valid variable name is a character string of letters, digits, and underscores, totaling not more than namelengthmax characters and beginning with a letter.

isvarname str uses the MATLAB command format.

Examples

This variable name is valid:

```
isvarname foo
ans = 
   1
```

This one is not because it starts with a number:

```
isvarname 8th_column
ans =
   0
```

If you are building strings from various pieces, place the construction in parentheses.

d = date;

isvarname(['Monday_', d(1:2)])
ans = 
   1

isvalid (timer) j