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BUILT-IN MATHEMATICA SYMBOL
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.
FromDigits["string"]
constructs an integer from a string of digits.
FromDigits["string", "Roman"]
constructs an integer from Roman numerals.
Details
- FromDigits is effectively the inverse of IntegerDigits and IntegerString.
- FromDigits[{list, n}, b] takes n to be an exponent, while FromDigits[{{a1, a2, ..., {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. »
- FromDigits["string", b] takes the digits in
to be given in base b. - In FromDigits["string", b], digits above 9 can be represented by letters
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or 
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New in 3 | Last modified in 6
