mpz_get_d_2exp
Damien Stehle
stehle at maths.usyd.edu.au
Wed Feb 1 23:12:02 CET 2006
Hello,
I guess I found a bug in the documentation of the function
double mpz_get_d_2exp (signed long int *EXP, mpz_t OP).
The doc says:
- Function: double mpz_get_d_2exp (signed long int *EXP, mpz_t OP)
Find D and EXP such that D times 2 raised to EXP, with
0.5<=abs(D)<1, is a good approximation to OP.
This is not corresponding to what happens for OP=0.
They had approximately the same bug in MPFR, and they corrected it
by something like:
Return D and set EXP such that 0.5<=|D|<1
and D times 2 raised to EXP is a good approximation to OP.
If OP is zero, then D=EXP=0.
Regards,
Damien Stehle
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