FromDigits
FromDigits[
list
] constructs an integer from the list of its decimal digits.
FromDigits[
list
,
b
] takes the digits to be given in base b.
Example: FromDigits[
3,7,4
]
 .
FromDigits is effectively the inverse of IntegerDigits.
FromDigits[
list
,
n
,
b
] takes n to be an exponent, while FromDigits[
list
,
rep
,
n
,
b
] takes rep to be repeated, so that FromDigits can also be used as the inverse of RealDigits.
Since IntegerDigits[
n
] discards the sign of n, FromDigits[IntegerDigits[
n
]] is Abs[
n
] not just n.
The digits in list and the base b need not be positive integers and can be any expression.
See The Mathematica Book on the web:Section 3.1.3.
See also: IntegerDigits, RealDigits, FromContinuedFraction.
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