HP 39G User Manual page 246

Format
NumCol
NumFont
NumIndep
15-40
Defines the number display format.
From Solve's Numeric Setup view, choose Standard,
Fixed, Scientific, or Engineering in the Number
Format field.
or
In a program, store the constant name (or its number) into the
variable Format.
1. Standard
2. Fixed
3. Scientific
4. Engineering
Note: Fraction is not a valid mode in aplets.
Except in Solve, the value of Format takes effect only after the
current aplet is saved with a new name. Until then, HFormat
is in effect.
Example
Scientific Format
or
3 Format
Defines the highlighted column in Numeric view.
In a program, type
n
NumCol
where n can be 0, 1, 2, 3, 4, 5, 6, 7, 8, 9.
Toggles the font size in Numeric view. Does not appear in the
Num Setup input form. Corresponds to the BIG key in
Numeric view.
In a program, type
NumFont for small (default).
0
NumFont for big.
1
List of independent values used by Build Your Own Table.
In a program, type
LIST NumIndep
Programming