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G4NeutronHPFastLegendre.hh
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29 #ifndef G4NeutronHPFastLegendre_h
30 #define G4NeutronHPFastLegendre_h 1
31 
32 #include "globals.hh"
33 
34 class G4NeutronHPFastLegendre
35 {
36  public:
37 
38  G4NeutronHPFastLegendre()
39  {
40  value = new G4double * [31];
41  value[0] = l0;
42  value[1] = l1;
43  value[2] = l2;
44  value[3] = l3;
45  value[4] = l4;
46  value[5] = l5;
47  value[6] = l6;
48  value[7] = l7;
49  value[8] = l8;
50  value[9] = l9;
51  value[10] = l10;
52  value[11] = l11;
53  value[12] = l12;
54  value[13] = l13;
55  value[14] = l14;
56  value[15] = l15;
57  value[16] = l16;
58  value[17] = l17;
59  value[18] = l18;
60  value[19] = l19;
61  value[20] = l20;
62  value[21] = l21;
63  value[22] = l22;
64  value[23] = l23;
65  value[24] = l24;
66  value[25] = l25;
67  value[26] = l26;
68  value[27] = l27;
69  value[28] = l28;
70  value[29] = l29;
71  value[30] = l30;
72  integral = new G4double * [31];
73  integral[0] = i0;
74  integral[1] = i1;
75  integral[2] = i2;
76  integral[3] = i3;
77  integral[4] = i4;
78  integral[5] = i5;
79  integral[6] = i6;
80  integral[7] = i7;
81  integral[8] = i8;
82  integral[9] = i9;
83  integral[10] = i10;
84  integral[11] = i11;
85  integral[12] = i12;
86  integral[13] = i13;
87  integral[14] = i14;
88  integral[15] = i15;
89  integral[16] = i16;
90  integral[17] = i17;
91  integral[18] = i18;
92  integral[19] = i19;
93  integral[20] = i20;
94  integral[21] = i21;
95  integral[22] = i22;
96  integral[23] = i23;
97  integral[24] = i24;
98  integral[25] = i25;
99  integral[26] = i26;
100  integral[27] = i27;
101  integral[28] = i28;
102  integral[29] = i29;
103  integral[30] = i30;
104 
105  G4int i;
106  for(i=0;i<31;i++) theNbin[i]=1+200*(i+1);
107  }
108 
109  ~G4NeutronHPFastLegendre()
110  {
111  delete [] value;
112  delete [] integral;
113  }
114 
115  G4double Integrate(G4int l, G4double costh)
116  {
117  if(l>30) return regularIntegrate(l,costh);
118  G4int bin = GetBin(l, costh);
119  G4double y1, y2;
120 // G4cout <<"Testhpw G4NeutronHPFastLegendre::Integrate "<<l<<" "<<bin<<G4endl;
121  y1 = integral[l][bin];
122  y2 = integral[l][bin+1];
123 // G4cout <<"Testhpw G4NeutronHPFastLegendre::Integrate exit"<<G4endl;
124  return Interpolate(bin, l, y1, y2, costh);
125  }
126 
127  inline G4double Evaluate(G4int l, G4double costh)
128  {
129  if(l>30) return regularEvaluate(l,costh);
130  G4double result;
131  G4int bin = GetBin(l, costh);
132  if(bin != theNbin[l]-1)
133  {
134  G4double y1, y2;
135  y1 = value[l][bin];
136  y2 = value[l][bin+1];
137  result = Interpolate(bin, l, y1, y2, costh);
138  }
139  else
140  {
141  result = value[l][bin];
142  }
143  return result;
144  }
145 
146  private:
147 
148  G4double regularEvaluate( int l , double x );
149  G4double regularIntegrate( int l , double x );
150 
151 
152  inline G4int GetBin(G4int l, G4double costh)
153  {
154  G4int bin=0;
155  bin = G4int( (theNbin[l]-1)*(costh+1)/2. );
156  if(bin == theNbin[l]-1) bin--;
157  return bin;
158  }
159 
160  inline G4double Interpolate(G4int bin, G4int l, G4double y1, G4double y2, G4double x)
161  {
162  G4double slope = 0, off = 0, x2=0, x1mx2;
163  G4int half = (theNbin[l]-1)/2;
164 // x1 = (bin-half)/G4double(half);
165  x2 = (bin+1-half)/G4double(half);
166  x1mx2 = 1./G4double( (theNbin[l]-1)/2 );
167 // slope = (y2-y1)/(x2-x1);
168  slope = (y2-y1)/x1mx2;
169  off = y2-x2*slope;
170  return x*slope+off;
171  }
172 
173  G4double ** value;
174  G4double ** integral;
175  G4int theNbin[31];
176  static G4double l0[201];
177  static G4double i0[201];
178  static G4double l1[401];
179  static G4double i1[401];
180  static G4double l2[601];
181  static G4double i2[601];
182  static G4double l3[801];
183  static G4double i3[801];
184  static G4double l4[1001];
185  static G4double i4[1001];
186  static G4double l5[1201];
187  static G4double i5[1201];
188  static G4double l6[1401];
189  static G4double i6[1401];
190  static G4double l7[1601];
191  static G4double i7[1601];
192  static G4double l8[1801];
193  static G4double i8[1801];
194  static G4double l9[2001];
195  static G4double i9[2001];
196  static G4double l10[2201];
197  static G4double i10[2201];
198  static G4double l11[2401];
199  static G4double i11[2401];
200  static G4double l12[2601];
201  static G4double i12[2601];
202  static G4double l13[2801];
203  static G4double i13[2801];
204  static G4double l14[3001];
205  static G4double i14[3001];
206  static G4double l15[3201];
207  static G4double i15[3201];
208  static G4double l16[3401];
209  static G4double i16[3401];
210  static G4double l17[3601];
211  static G4double i17[3601];
212  static G4double l18[3801];
213  static G4double i18[3801];
214  static G4double l19[4001];
215  static G4double i19[4001];
216  static G4double l20[4201];
217  static G4double i20[4201];
218  static G4double l21[4401];
219  static G4double i21[4401];
220  static G4double l22[4601];
221  static G4double i22[4601];
222  static G4double l23[4801];
223  static G4double i23[4801];
224  static G4double l24[5001];
225  static G4double i24[5001];
226  static G4double l25[5201];
227  static G4double i25[5201];
228  static G4double l26[5401];
229  static G4double i26[5401];
230  static G4double l27[5601];
231  static G4double i27[5601];
232  static G4double l28[5801];
233  static G4double i28[5801];
234  static G4double l29[6001];
235  static G4double i29[6001];
236  static G4double l30[6201];
237  static G4double i30[6201];
238 };
239 #endif
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