NumberPadding is an option for NumberForm and related functions which gives strings to use as padding on the left- and right-hand sides of numbers.
specifies strings to use for padding on the left and right.
In NumberForm, the default setting is NumberPadding
In PaddedForm, the default setting is NumberPadding
The strings specified as padding are inserted in place of digits.
See the Mathematica book: Section 2.8.7.
See also: SignPadding.
With the default setting for the option NumberPadding, both NumberForm and PaddedForm insert trailing zeros when they pad a number on the right. You can use spaces for padding on both the left and the right by setting NumberPadding
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