1 | #include <iostream> |
---|
2 | #include <stdlib.h> |
---|
3 | #include <time.h> |
---|
4 | #include <math.h> |
---|
5 | |
---|
6 | float getNormalRV() |
---|
7 | { |
---|
8 | float v1,v2,s; |
---|
9 | do{ |
---|
10 | v1 = 2.*(1.*rand())/(RAND_MAX+1.0) - 1.; |
---|
11 | v2 = 2.*(1.*rand())/(RAND_MAX+1.0) - 1.; |
---|
12 | s = v1*v1+v2*v2; |
---|
13 | }while(s>1); |
---|
14 | return sqrt(-2.*log(s)/s)*v1; |
---|
15 | |
---|
16 | } |
---|
17 | |
---|
18 | float getNormalRV(float mean, float sigma) |
---|
19 | { |
---|
20 | float v1,v2,s; |
---|
21 | do{ |
---|
22 | v1 = 2.*(1.*rand())/(RAND_MAX+1.0) - 1.; |
---|
23 | v2 = 2.*(1.*rand())/(RAND_MAX+1.0) - 1.; |
---|
24 | s = v1*v1+v2*v2; |
---|
25 | }while(s>1); |
---|
26 | float z=sqrt(-2.*log(s)/s)*v1; |
---|
27 | return z*sigma + mean; |
---|
28 | } |
---|
29 | |
---|
30 | void getRandomSpectrum(int length, float *x, float *y) |
---|
31 | { |
---|
32 | srandom(time(0)); |
---|
33 | rand(); |
---|
34 | |
---|
35 | for(int i=0;i<length;i++){ |
---|
36 | x[i] = i; |
---|
37 | // simulate a standard normal RV via polar method |
---|
38 | float v1,v2,s; |
---|
39 | do{ |
---|
40 | v1 = 2.*(1.*rand())/(RAND_MAX+1.0) - 1.; |
---|
41 | v2 = 2.*(1.*rand())/(RAND_MAX+1.0) - 1.; |
---|
42 | s = v1*v1+v2*v2; |
---|
43 | }while(s>1); |
---|
44 | y[i] = sqrt(-2.*log(s)/s)*v1; |
---|
45 | } |
---|
46 | } |
---|
47 | |
---|
48 | void getRandomSpectrum(int length, float *x, double *y) |
---|
49 | { |
---|
50 | srandom(time(0)); |
---|
51 | rand(); |
---|
52 | for(int i=0;i<length;i++){ |
---|
53 | x[i] = (float)i; |
---|
54 | // simulate a standard normal RV via polar method |
---|
55 | double v1,v2,s; |
---|
56 | do{ |
---|
57 | v1 = 2.*(1.*rand())/(RAND_MAX+1.0) - 1.; |
---|
58 | v2 = 2.*(1.*rand())/(RAND_MAX+1.0) - 1.; |
---|
59 | s = v1*v1+v2*v2; |
---|
60 | }while(s>1); |
---|
61 | y[i] = sqrt(-2.*log(s)/s)*v1; |
---|
62 | // cerr<< x[i]<<" " << y[i]<<endl; |
---|
63 | } |
---|
64 | } |
---|
65 | |
---|
66 | |
---|
67 | void getRandomSpectrum(int length, float mean, float sigma, float *x, double *y) |
---|
68 | { |
---|
69 | srandom(time(0)); |
---|
70 | rand(); |
---|
71 | for(int i=0;i<length;i++){ |
---|
72 | x[i] = (float)i; |
---|
73 | // simulate a standard normal RV via polar method |
---|
74 | double v1,v2,s; |
---|
75 | do{ |
---|
76 | v1 = 2.*(1.*rand())/(RAND_MAX+1.0) - 1.; |
---|
77 | v2 = 2.*(1.*rand())/(RAND_MAX+1.0) - 1.; |
---|
78 | s = v1*v1+v2*v2; |
---|
79 | }while(s>1); |
---|
80 | float z = sqrt(-2.*log(s)/s)*v1; |
---|
81 | y[i] = z * sigma + mean; |
---|
82 | // cerr<< x[i]<<" " << y[i]<<endl; |
---|
83 | } |
---|
84 | } |
---|
85 | |
---|
86 | void getRandomSpectrum(int length, float mean, float sigma, float *x, float *y) |
---|
87 | { |
---|
88 | srandom(time(0)); |
---|
89 | rand(); |
---|
90 | for(int i=0;i<length;i++){ |
---|
91 | x[i] = (float)i; |
---|
92 | // simulate a standard normal RV via polar method |
---|
93 | float v1,v2,s; |
---|
94 | do{ |
---|
95 | v1 = 2.*(1.*rand())/(RAND_MAX+1.0) - 1.; |
---|
96 | v2 = 2.*(1.*rand())/(RAND_MAX+1.0) - 1.; |
---|
97 | s = v1*v1+v2*v2; |
---|
98 | }while(s>1); |
---|
99 | float z = sqrt(-2.*log(s)/s)*v1; |
---|
100 | y[i] = z * sigma + mean; |
---|
101 | // cerr<< x[i]<<" " << y[i]<<endl; |
---|
102 | } |
---|
103 | } |
---|
104 | |
---|