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cf_roots.cc
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1//*****************************************************************************
2
3
4#include "config.h"
5
6
7#include "cf_assert.h"
8#include "debug.h"
9
10#include "canonicalform.h"
11#include "cf_util.h"
12#include "imm.h"
13#include "cf_iter.h"
14
15#ifdef HAVE_NTL
16#include "NTLconvert.h"
17#endif
18
19#ifdef HAVE_FLINT
20#include "FLINTconvert.h"
21#include "flint/nmod_poly_factor.h"
22#endif
23
24#include "cf_roots.h"
25
27{
28 int p= getCharacteristic ();
29 #if defined(HAVE_FLINT) && (__FLINT_RELEASE >= 20503)
30 nmod_poly_t FLINT_f;
32 nmod_poly_factor_t fac;
33 nmod_poly_factor_init(fac);
34 nmod_poly_roots(fac,FLINT_f,0);
35 int *res=NEW_ARRAY(int,1+fac->num);
36
37 int j=1;
38 for(int i=fac->num-1; i>=0;i--)
39 {
40 // root of (linear) factor: -absolute Term
41 if (nmod_poly_length(fac->p+i)==2)
42 {
43 res[j]=p-nmod_poly_get_coeff_ui(fac->p+i,0);
44 j++;
45 }
46 }
47 res[0]=j-1;
48 // cleanup
49 nmod_poly_clear(FLINT_f);
50 nmod_poly_factor_clear(fac);
51 return res;
52 #elif defined(HAVE_NTL)
53 if (fac_NTL_char != p)
54 {
56 zz_p::init (p);
57 }
58 zz_pX NTL_f= convertFacCF2NTLzzpX (f);
59 vec_zz_p roots= FindRoots (NTL_f);
60 int *res=NEW_ARRAY(int,1+roots.length());
61 res[0]=roots.length();
62 for(int i=roots.length()-1;i>=0;i--)
63 {
64 res[i+1]=to_long(rep(roots[i]));
65 }
66 return res;
67 #else
68 factoryError("NTL/FLINT missing: Zp_roots");
69 return NULL;
70 #endif
71}
72
This file defines functions for conversion to FLINT (www.flintlib.org) and back.
zz_pX convertFacCF2NTLzzpX(const CanonicalForm &f)
VAR long fac_NTL_char
Definition NTLconvert.cc:46
Conversion to and from NTL.
Header for factory's main class CanonicalForm.
int FACTORY_PUBLIC getCharacteristic()
Definition cf_char.cc:70
int i
Definition cfEzgcd.cc:132
int p
Definition cfModGcd.cc:4086
assertions for Factory
#define NEW_ARRAY(T, N)
Definition cf_defs.h:64
Iterators for CanonicalForm's.
int * Zp_roots(const CanonicalForm f)
Definition cf_roots.cc:26
VAR void(* factoryError)(const char *s)
Definition cf_util.cc:80
FILE * f
Definition checklibs.c:9
factory's main class
functions to print debug output
CanonicalForm res
Definition facAbsFact.cc:60
int j
Definition facHensel.cc:110
convertFacCF2nmod_poly_t(FLINTmipo, M)
nmod_poly_clear(FLINTmipo)
operations on immediates, that is elements of F_p, GF, Z, Q that fit into intrinsic int,...
#define NULL
Definition omList.c:12