FromDigits

Usage

• FromDigits[list] constructs an integer from the list of its decimal digits.
• FromDigits[list, b] takes the digits to be given in base b.

Notes

• 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.

• If Indeterminate appears in list, it is assumed to signify unknown digits beyond the precision of an approximate real number.

• See Section 3.1.3.

• New in Version 3; modified in 4.

Further Examples