sizeinbase {gmp}

Compute size of a bigz in a base

Description

Return an approximation to the number of character the integer X would have printed in base b. The approximation is never too small.

In case of powers of 2, function gives exact result.

Usage

sizeinbase(a, b=10)

Arguments

a

big integer, i.e. "bigz"

b

base

Value

integer of the same length as a: the size, i.e. number of digits, of each a[i].

Author(s)

Antoine Lucas

References

The GNU MP Library, see https://gmplib.org

Examples

sizeinbase(342434, 10)# 6 obviously

Iv <- as.bigz(2:7)^500
sizeinbase(Iv)
stopifnot(sizeinbase(Iv)       == nchar(as.character(Iv)),
          sizeinbase(Iv, b=16) == nchar(as.character(Iv, b=16)))