1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
|
#pragma once
#include <stdlib.h>
#include <cmath>
#include "types.h"
/* The following is the minimum definition of a spin class.
*
* The class must contain an M_t and an F_t for holding the sum of an
* integer number of spins and a double-weighted number of spins,
* respectively.
*
* void init(X_t *p);
* void free_spin(X_t p);
* X_t copy(X_t x);
* void add(M_t *x1, int factor, X_t x2);
* void add(F_t *x1, double factor, X_t x2);
* M_t scalar_multiple(int factor, X_t x);
* double norm_squared(F_t x);
* void write_magnetization(M_t M, FILE *outfile);
*
*/
template <q_t q, class T>
class vector_t {
public:
T *x;
// M_t needs to hold the sum of nv spins
typedef vector_t <q, T> M_t;
// F_t needs to hold the double-weighted sum of spins
typedef vector_t <q, double> F_t;
};
template <q_t q, class T>
void init(vector_t <q, T> *ptr) {
ptr->x = (T *)calloc(q, sizeof(T));
// initialize a unit vector
ptr->x[0] = (T)1;
}
template <q_t q, class T>
void free_spin (vector_t <q, T> v) {
free(v.x);
}
template <q_t q, class T>
vector_t <q, T> copy (vector_t <q, T> v) {
vector_t <q, T> v_copy;
v_copy.x = (T *)calloc(q, sizeof(T));
for (q_t i = 0; i < q; i++) {
v_copy.x[i] = v.x[i];
}
return v_copy;
}
template <q_t q, class T, class U, class V>
void add(vector_t<q, U> *v1, V a, vector_t <q, T> v2) {
for (q_t i = 0; i < q; i++) {
v1->x[i] += (U)(a * v2.x[i]);
}
}
template <q_t q, class T>
vector_t <q, T> scalar_multiple(int a, vector_t <q, T> v) {
vector_t <q, T> multiple;
multiple.x = (T *)malloc(q * sizeof(T));
for (q_t i = 0; i < q; i++) {
multiple.x[i] = a * v.x[i];
}
return multiple;
}
template <q_t q, class T>
double norm_squared (vector_t <q, T> v) {
double tmp = 0;
for (q_t i = 0; i < q; i++) {
tmp += pow(v.x[i], 2);
}
return tmp;
}
template <q_t q, class T>
void write_magnetization(vector_t <q, T> M, FILE *outfile) {
fwrite(M.x, sizeof(T), q, outfile);
}
// below functions and definitions are unnecessary for wolff.h but useful.
template <q_t q> // save some space and don't write whole doubles
void write_magnetization(vector_t <q, double> M, FILE *outfile) {
for (q_t i = 0; i < q; i++) {
float M_tmp = (float)M.x[i];
fwrite(&M_tmp, sizeof(float), 1, outfile);
}
}
template <q_t q, class T>
T dot(vector_t <q, T> v1, vector_t <q, T> v2) {
T prod = 0;
for (q_t i = 0; i < q; i++) {
prod += v1.x[i] * v2.x[i];
}
return prod;
}
template <q_t q, class T>
double H_vector(vector_t <q, T> v1, T *H) {
vector_t <q, T> H_vec;
H_vec.x = H;
return (double)(dot <q, T> (v1, H_vec));
}
char const *ON_strings[] = {"TRIVIAL", "ISING", "PLANAR", "HEISENBERG"};
|
