|   | 
Formats a real value and returns a string representation of it.
| Number | Type | Compulsory | Default | Description | 
|---|---|---|---|---|
| 1 | real | Yes | 
 | number | 
| 2 | real | Yes | 
 | significant digits | 
| 3 | string | No | 'eng' | format | 
Format options are:
| 'eng' | (default if omitted). Formats the number using engineering units | 
| 'noeng' | Normal format. Will use 'E' if necessary | 
| '%' | Formats as a percentage | 
Return type: real
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