On 5/12/2011 2:13 PM, Bill Hart wrote:
There might be a way. But it would be in the mpfr documentation.
There should be no problems with either MPIR or MPFR on Windows.
Bill.
On 12 May 2011 19:00, Bob Smith<bsm...@sudleyplace.com> wrote:
I need this function to extend mpz_fac_ui to non-integral arguments. I see
it's in the MPFR library. If I calculate in that library, is there a direct
way to convert the result to mpf format?
Or should I solve this problem entirely differently?
My code needs to run on both Windows and Linux platforms.
I see that the MPFR docs describe how to use mpf code with mpfr, but I'm
working in the opposite direction: how to use an mpfr result with mpf.
Looking at the two structs: __mpf_struct and __mpfr_struct
typedef struct
{
int _mp_prec; /* Max precision, in number of `mp_limb_t's.
Set by mpf_init and modified by
mpf_set_prec. The area pointed to by the
_mp_d field contains `prec' + 1 limbs. */
int _mp_size; /* abs(_mp_size) is the number of limbs the
last field points to. If _mp_size is
negative this is a negative number. */
mp_exp_t _mp_exp; /* Exponent, in the base of `mp_limb_t'. */
mp_limb_t *_mp_d; /* Pointer to the limbs. */
} __mpf_struct;
typedef struct {
mpfr_prec_t _mpfr_prec;
mpfr_sign_t _mpfr_sign;
mpfr_exp_t _mpfr_exp;
mp_limb_t *_mpfr_d;
} __mpfr_struct;
is the correspondence as simple as
mpfr_t mpfrVal;
mpf_t mpfVal;
mpfVal->_mp_prec = mpfrVal->_mpfr_prec;
mpfVal->_mp_size = mpfrVal->_mpfr_sign ? -mpfrVal->_mpfr_prec
: mpfrVal->_mpfr_prec;
mpfVal->_mp_exp = mpfrVal->_mp_exp;
mpfVal->_mp_d = mpfrVal->_mp_d;
assuming both numbers have the same # bits per limb?
--
_______________________________________________________________
Bob Smith - bsm...@sudleyplace.com
http://www.sudleyplace.com - http://www.nars2000.org
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