[4] | 1 | /************************************************************** ggt-head beg |
---|
| 2 | * |
---|
| 3 | * GGT: Generic Graphics Toolkit |
---|
| 4 | * |
---|
| 5 | * Original Authors: |
---|
| 6 | * Allen Bierbaum |
---|
| 7 | * |
---|
| 8 | * ----------------------------------------------------------------- |
---|
| 9 | * File: Eigen.h,v |
---|
| 10 | * Date modified: 2002/02/10 04:38:07 |
---|
| 11 | * Version: 1.4 |
---|
| 12 | * ----------------------------------------------------------------- |
---|
| 13 | * |
---|
| 14 | *********************************************************** ggt-head end */ |
---|
| 15 | /*************************************************************** ggt-cpr beg |
---|
| 16 | * |
---|
| 17 | * GGT: The Generic Graphics Toolkit |
---|
| 18 | * Copyright (C) 2001,2002 Allen Bierbaum |
---|
| 19 | * |
---|
| 20 | * This library is free software; you can redistribute it and/or |
---|
| 21 | * modify it under the terms of the GNU Lesser General Public |
---|
| 22 | * License as published by the Free Software Foundation; either |
---|
| 23 | * version 2.1 of the License, or (at your option) any later version. |
---|
| 24 | * |
---|
| 25 | * This library is distributed in the hope that it will be useful, |
---|
| 26 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
---|
| 27 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
---|
| 28 | * Lesser General Public License for more details. |
---|
| 29 | * |
---|
| 30 | * You should have received a copy of the GNU Lesser General Public |
---|
| 31 | * License along with this library; if not, write to the Free Software |
---|
| 32 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
---|
| 33 | * |
---|
| 34 | ************************************************************ ggt-cpr end */ |
---|
| 35 | // |
---|
| 36 | // XXX: Based on source code from: Magic Software, Inc. |
---|
| 37 | // |
---|
| 38 | #ifndef _EIGEN_H |
---|
| 39 | #define _EIGEN_H |
---|
| 40 | |
---|
| 41 | #include <gmtl/gmtlConfig.h> |
---|
| 42 | |
---|
| 43 | namespace gmtl |
---|
| 44 | { |
---|
| 45 | |
---|
| 46 | class Eigen |
---|
| 47 | { |
---|
| 48 | public: |
---|
| 49 | Eigen (int iSize); |
---|
| 50 | ~Eigen (); |
---|
| 51 | |
---|
| 52 | // set the matrix for eigensolving |
---|
| 53 | float& Matrix (int iRow, int iCol); |
---|
| 54 | void SetMatrix (float** aafMat); |
---|
| 55 | |
---|
| 56 | // get the results of eigensolving (eigenvectors are columns of matrix) |
---|
| 57 | float GetEigenvalue (int i) const; |
---|
| 58 | float GetEigenvector (int iRow, int iCol) const; |
---|
| 59 | float* GetEigenvalue (); |
---|
| 60 | float** GetEigenvector (); |
---|
| 61 | |
---|
| 62 | // solve eigensystem |
---|
| 63 | void EigenStuff2 (); |
---|
| 64 | void EigenStuff3 (); |
---|
| 65 | void EigenStuff4 (); |
---|
| 66 | void EigenStuffN (); |
---|
| 67 | void EigenStuff (); |
---|
| 68 | |
---|
| 69 | // solve eigensystem, use decreasing sort on eigenvalues |
---|
| 70 | void DecrSortEigenStuff2 (); |
---|
| 71 | void DecrSortEigenStuff3 (); |
---|
| 72 | void DecrSortEigenStuff4 (); |
---|
| 73 | void DecrSortEigenStuffN (); |
---|
| 74 | void DecrSortEigenStuff (); |
---|
| 75 | |
---|
| 76 | // solve eigensystem, use increasing sort on eigenvalues |
---|
| 77 | void IncrSortEigenStuff2 (); |
---|
| 78 | void IncrSortEigenStuff3 (); |
---|
| 79 | void IncrSortEigenStuff4 (); |
---|
| 80 | void IncrSortEigenStuffN (); |
---|
| 81 | void IncrSortEigenStuff (); |
---|
| 82 | |
---|
| 83 | protected: |
---|
| 84 | int m_iSize; |
---|
| 85 | float** m_aafMat; |
---|
| 86 | float* m_afDiag; |
---|
| 87 | float* m_afSubd; |
---|
| 88 | |
---|
| 89 | // Householder reduction to tridiagonal form |
---|
| 90 | static void Tridiagonal2 (float** aafMat, float* afDiag, |
---|
| 91 | float* afSubd); |
---|
| 92 | static void Tridiagonal3 (float** aafMat, float* afDiag, |
---|
| 93 | float* afSubd); |
---|
| 94 | static void Tridiagonal4 (float** aafMat, float* afDiag, |
---|
| 95 | float* afSubd); |
---|
| 96 | static void TridiagonalN (int iSize, float** aafMat, float* afDiag, |
---|
| 97 | float* afSubd); |
---|
| 98 | |
---|
| 99 | // QL algorithm with implicit shifting, applies to tridiagonal matrices |
---|
| 100 | static bool QLAlgorithm (int iSize, float* afDiag, float* afSubd, |
---|
| 101 | float** aafMat); |
---|
| 102 | |
---|
| 103 | // sort eigenvalues from largest to smallest |
---|
| 104 | static void DecreasingSort (int iSize, float* afEigval, |
---|
| 105 | float** aafEigvec); |
---|
| 106 | |
---|
| 107 | // sort eigenvalues from smallest to largest |
---|
| 108 | static void IncreasingSort (int iSize, float* afEigval, |
---|
| 109 | float** aafEigvec); |
---|
| 110 | }; |
---|
| 111 | |
---|
| 112 | //--------------------------------------------------------------------------- |
---|
| 113 | inline float& Eigen::Matrix (int iRow, int iCol) |
---|
| 114 | { |
---|
| 115 | return m_aafMat[iRow][iCol]; |
---|
| 116 | } |
---|
| 117 | //--------------------------------------------------------------------------- |
---|
| 118 | inline float Eigen::GetEigenvalue (int i) const |
---|
| 119 | { |
---|
| 120 | return m_afDiag[i]; |
---|
| 121 | } |
---|
| 122 | //--------------------------------------------------------------------------- |
---|
| 123 | inline float Eigen::GetEigenvector (int iRow, int iCol) const |
---|
| 124 | { |
---|
| 125 | return m_aafMat[iRow][iCol]; |
---|
| 126 | } |
---|
| 127 | //--------------------------------------------------------------------------- |
---|
| 128 | inline float* Eigen::GetEigenvalue () |
---|
| 129 | { |
---|
| 130 | return m_afDiag; |
---|
| 131 | } |
---|
| 132 | //--------------------------------------------------------------------------- |
---|
| 133 | inline float** Eigen::GetEigenvector () |
---|
| 134 | { |
---|
| 135 | return m_aafMat; |
---|
| 136 | } |
---|
| 137 | //--------------------------------------------------------------------------- |
---|
| 138 | |
---|
| 139 | |
---|
| 140 | |
---|
| 141 | |
---|
| 142 | |
---|
| 143 | //--------------------------------------------------------------------------- |
---|
| 144 | Eigen::Eigen (int iSize) |
---|
| 145 | { |
---|
| 146 | assert( iSize >= 2 ); |
---|
| 147 | m_iSize = iSize; |
---|
| 148 | |
---|
| 149 | m_aafMat = new float*[m_iSize]; |
---|
| 150 | for (int i = 0; i < m_iSize; i++) |
---|
| 151 | m_aafMat[i] = new float[m_iSize]; |
---|
| 152 | |
---|
| 153 | m_afDiag = new float[m_iSize]; |
---|
| 154 | m_afSubd = new float[m_iSize]; |
---|
| 155 | } |
---|
| 156 | //--------------------------------------------------------------------------- |
---|
| 157 | Eigen::~Eigen () |
---|
| 158 | { |
---|
| 159 | delete[] m_afSubd; |
---|
| 160 | delete[] m_afDiag; |
---|
| 161 | for (int i = 0; i < m_iSize; i++) |
---|
| 162 | delete[] m_aafMat[i]; |
---|
| 163 | delete[] m_aafMat; |
---|
| 164 | } |
---|
| 165 | //--------------------------------------------------------------------------- |
---|
| 166 | void Eigen::Tridiagonal2 (float** m_aafMat, float* m_afDiag, |
---|
| 167 | float* m_afSubd) |
---|
| 168 | { |
---|
| 169 | // matrix is already tridiagonal |
---|
| 170 | m_afDiag[0] = m_aafMat[0][0]; |
---|
| 171 | m_afDiag[1] = m_aafMat[1][1]; |
---|
| 172 | m_afSubd[0] = m_aafMat[0][1]; |
---|
| 173 | m_afSubd[1] = 0.0; |
---|
| 174 | m_aafMat[0][0] = 1.0; |
---|
| 175 | m_aafMat[0][1] = 0.0; |
---|
| 176 | m_aafMat[1][0] = 0.0; |
---|
| 177 | m_aafMat[1][1] = 1.0; |
---|
| 178 | } |
---|
| 179 | //--------------------------------------------------------------------------- |
---|
| 180 | void Eigen::Tridiagonal3 (float** m_aafMat, float* m_afDiag, |
---|
| 181 | float* m_afSubd) |
---|
| 182 | { |
---|
| 183 | float fM00 = m_aafMat[0][0]; |
---|
| 184 | float fM01 = m_aafMat[0][1]; |
---|
| 185 | float fM02 = m_aafMat[0][2]; |
---|
| 186 | float fM11 = m_aafMat[1][1]; |
---|
| 187 | float fM12 = m_aafMat[1][2]; |
---|
| 188 | float fM22 = m_aafMat[2][2]; |
---|
| 189 | |
---|
| 190 | m_afDiag[0] = fM00; |
---|
| 191 | m_afSubd[2] = 0.0; |
---|
| 192 | if ( fM02 != 0.0 ) |
---|
| 193 | { |
---|
| 194 | float fLength = Math::sqrt(fM01*fM01+fM02*fM02); |
---|
| 195 | float fInvLength = 1.0/fLength; |
---|
| 196 | fM01 *= fInvLength; |
---|
| 197 | fM02 *= fInvLength; |
---|
| 198 | float fQ = 2.0*fM01*fM12+fM02*(fM22-fM11); |
---|
| 199 | m_afDiag[1] = fM11+fM02*fQ; |
---|
| 200 | m_afDiag[2] = fM22-fM02*fQ; |
---|
| 201 | m_afSubd[0] = fLength; |
---|
| 202 | m_afSubd[1] = fM12-fM01*fQ; |
---|
| 203 | m_aafMat[0][0] = 1.0; m_aafMat[0][1] = 0.0; m_aafMat[0][2] = 0.0; |
---|
| 204 | m_aafMat[1][0] = 0.0; m_aafMat[1][1] = fM01; m_aafMat[1][2] = fM02; |
---|
| 205 | m_aafMat[2][0] = 0.0; m_aafMat[2][1] = fM02; m_aafMat[2][2] = -fM01; |
---|
| 206 | } |
---|
| 207 | else |
---|
| 208 | { |
---|
| 209 | m_afDiag[1] = fM11; |
---|
| 210 | m_afDiag[2] = fM22; |
---|
| 211 | m_afSubd[0] = fM01; |
---|
| 212 | m_afSubd[1] = fM12; |
---|
| 213 | m_aafMat[0][0] = 1.0; m_aafMat[0][1] = 0.0; m_aafMat[0][2] = 0.0; |
---|
| 214 | m_aafMat[1][0] = 0.0; m_aafMat[1][1] = 1.0; m_aafMat[1][2] = 0.0; |
---|
| 215 | m_aafMat[2][0] = 0.0; m_aafMat[2][1] = 0.0; m_aafMat[2][2] = 1.0; |
---|
| 216 | } |
---|
| 217 | } |
---|
| 218 | //--------------------------------------------------------------------------- |
---|
| 219 | void Eigen::Tridiagonal4 (float** m_aafMat, float* m_afDiag, |
---|
| 220 | float* m_afSubd) |
---|
| 221 | { |
---|
| 222 | // save matrix M |
---|
| 223 | float fM00 = m_aafMat[0][0]; |
---|
| 224 | float fM01 = m_aafMat[0][1]; |
---|
| 225 | float fM02 = m_aafMat[0][2]; |
---|
| 226 | float fM03 = m_aafMat[0][3]; |
---|
| 227 | float fM11 = m_aafMat[1][1]; |
---|
| 228 | float fM12 = m_aafMat[1][2]; |
---|
| 229 | float fM13 = m_aafMat[1][3]; |
---|
| 230 | float fM22 = m_aafMat[2][2]; |
---|
| 231 | float fM23 = m_aafMat[2][3]; |
---|
| 232 | float fM33 = m_aafMat[3][3]; |
---|
| 233 | |
---|
| 234 | m_afDiag[0] = fM00; |
---|
| 235 | m_afSubd[3] = 0.0; |
---|
| 236 | |
---|
| 237 | m_aafMat[0][0] = 1.0; |
---|
| 238 | m_aafMat[0][1] = 0.0; |
---|
| 239 | m_aafMat[0][2] = 0.0; |
---|
| 240 | m_aafMat[0][3] = 0.0; |
---|
| 241 | m_aafMat[1][0] = 0.0; |
---|
| 242 | m_aafMat[2][0] = 0.0; |
---|
| 243 | m_aafMat[3][0] = 0.0; |
---|
| 244 | |
---|
| 245 | float fLength, fInvLength; |
---|
| 246 | |
---|
| 247 | if ( fM02 != 0.0 || fM03 != 0.0 ) |
---|
| 248 | { |
---|
| 249 | float fQ11, fQ12, fQ13; |
---|
| 250 | float fQ21, fQ22, fQ23; |
---|
| 251 | float fQ31, fQ32, fQ33; |
---|
| 252 | |
---|
| 253 | // build column Q1 |
---|
| 254 | fLength = Math::sqrt(fM01*fM01 + fM02*fM02 + fM03*fM03); |
---|
| 255 | fInvLength = 1.0/fLength; |
---|
| 256 | fQ11 = fM01*fInvLength; |
---|
| 257 | fQ21 = fM02*fInvLength; |
---|
| 258 | fQ31 = fM03*fInvLength; |
---|
| 259 | |
---|
| 260 | m_afSubd[0] = fLength; |
---|
| 261 | |
---|
| 262 | // compute S*Q1 |
---|
| 263 | float fV0 = fM11*fQ11+fM12*fQ21+fM13*fQ31; |
---|
| 264 | float fV1 = fM12*fQ11+fM22*fQ21+fM23*fQ31; |
---|
| 265 | float fV2 = fM13*fQ11+fM23*fQ21+fM33*fQ31; |
---|
| 266 | |
---|
| 267 | m_afDiag[1] = fQ11*fV0+fQ21*fV1+fQ31*fV2; |
---|
| 268 | |
---|
| 269 | // build column Q3 = Q1x(S*Q1) |
---|
| 270 | fQ13 = fQ21*fV2-fQ31*fV1; |
---|
| 271 | fQ23 = fQ31*fV0-fQ11*fV2; |
---|
| 272 | fQ33 = fQ11*fV1-fQ21*fV0; |
---|
| 273 | fLength = Math::sqrt(fQ13*fQ13+fQ23*fQ23+fQ33*fQ33); |
---|
| 274 | if ( fLength > 0.0 ) |
---|
| 275 | { |
---|
| 276 | fInvLength = 1.0/fLength; |
---|
| 277 | fQ13 *= fInvLength; |
---|
| 278 | fQ23 *= fInvLength; |
---|
| 279 | fQ33 *= fInvLength; |
---|
| 280 | |
---|
| 281 | // build column Q2 = Q3xQ1 |
---|
| 282 | fQ12 = fQ23*fQ31-fQ33*fQ21; |
---|
| 283 | fQ22 = fQ33*fQ11-fQ13*fQ31; |
---|
| 284 | fQ32 = fQ13*fQ21-fQ23*fQ11; |
---|
| 285 | |
---|
| 286 | fV0 = fQ12*fM11+fQ22*fM12+fQ32*fM13; |
---|
| 287 | fV1 = fQ12*fM12+fQ22*fM22+fQ32*fM23; |
---|
| 288 | fV2 = fQ12*fM13+fQ22*fM23+fQ32*fM33; |
---|
| 289 | m_afSubd[1] = fQ11*fV0+fQ21*fV1+fQ31*fV2; |
---|
| 290 | m_afDiag[2] = fQ12*fV0+fQ22*fV1+fQ32*fV2; |
---|
| 291 | m_afSubd[2] = fQ13*fV0+fQ23*fV1+fQ33*fV2; |
---|
| 292 | |
---|
| 293 | fV0 = fQ13*fM11+fQ23*fM12+fQ33*fM13; |
---|
| 294 | fV1 = fQ13*fM12+fQ23*fM22+fQ33*fM23; |
---|
| 295 | fV2 = fQ13*fM13+fQ23*fM23+fQ33*fM33; |
---|
| 296 | m_afDiag[3] = fQ13*fV0+fQ23*fV1+fQ33*fV2; |
---|
| 297 | } |
---|
| 298 | else |
---|
| 299 | { |
---|
| 300 | // S*Q1 parallel to Q1, choose any valid Q2 and Q3 |
---|
| 301 | m_afSubd[1] = 0; |
---|
| 302 | |
---|
| 303 | fLength = fQ21*fQ21+fQ31*fQ31; |
---|
| 304 | if ( fLength > 0.0 ) |
---|
| 305 | { |
---|
| 306 | fInvLength = 1.0/fLength; |
---|
| 307 | float fTmp = fQ11-1.0; |
---|
| 308 | fQ12 = -fQ21; |
---|
| 309 | fQ22 = 1.0+fTmp*fQ21*fQ21*fInvLength; |
---|
| 310 | fQ32 = fTmp*fQ21*fQ31*fInvLength; |
---|
| 311 | |
---|
| 312 | fQ13 = -fQ31; |
---|
| 313 | fQ23 = fQ32; |
---|
| 314 | fQ33 = 1.0+fTmp*fQ31*fQ31*fInvLength; |
---|
| 315 | |
---|
| 316 | fV0 = fQ12*fM11+fQ22*fM12+fQ32*fM13; |
---|
| 317 | fV1 = fQ12*fM12+fQ22*fM22+fQ32*fM23; |
---|
| 318 | fV2 = fQ12*fM13+fQ22*fM23+fQ32*fM33; |
---|
| 319 | m_afDiag[2] = fQ12*fV0+fQ22*fV1+fQ32*fV2; |
---|
| 320 | m_afSubd[2] = fQ13*fV0+fQ23*fV1+fQ33*fV2; |
---|
| 321 | |
---|
| 322 | fV0 = fQ13*fM11+fQ23*fM12+fQ33*fM13; |
---|
| 323 | fV1 = fQ13*fM12+fQ23*fM22+fQ33*fM23; |
---|
| 324 | fV2 = fQ13*fM13+fQ23*fM23+fQ33*fM33; |
---|
| 325 | m_afDiag[3] = fQ13*fV0+fQ23*fV1+fQ33*fV2; |
---|
| 326 | } |
---|
| 327 | else |
---|
| 328 | { |
---|
| 329 | // Q1 = (+-1,0,0) |
---|
| 330 | fQ12 = 0.0; fQ22 = 1.0; fQ32 = 0.0; |
---|
| 331 | fQ13 = 0.0; fQ23 = 0.0; fQ33 = 1.0; |
---|
| 332 | |
---|
| 333 | m_afDiag[2] = fM22; |
---|
| 334 | m_afDiag[3] = fM33; |
---|
| 335 | m_afSubd[2] = fM23; |
---|
| 336 | } |
---|
| 337 | } |
---|
| 338 | |
---|
| 339 | m_aafMat[1][1] = fQ11; m_aafMat[1][2] = fQ12; m_aafMat[1][3] = fQ13; |
---|
| 340 | m_aafMat[2][1] = fQ21; m_aafMat[2][2] = fQ22; m_aafMat[2][3] = fQ23; |
---|
| 341 | m_aafMat[3][1] = fQ31; m_aafMat[3][2] = fQ32; m_aafMat[3][3] = fQ33; |
---|
| 342 | } |
---|
| 343 | else |
---|
| 344 | { |
---|
| 345 | m_afDiag[1] = fM11; |
---|
| 346 | m_afSubd[0] = fM01; |
---|
| 347 | m_aafMat[1][1] = 1.0; |
---|
| 348 | m_aafMat[2][1] = 0.0; |
---|
| 349 | m_aafMat[3][1] = 0.0; |
---|
| 350 | |
---|
| 351 | if ( fM13 != 0.0 ) |
---|
| 352 | { |
---|
| 353 | fLength = Math::sqrt(fM12*fM12+fM13*fM13); |
---|
| 354 | fInvLength = 1.0/fLength; |
---|
| 355 | fM12 *= fInvLength; |
---|
| 356 | fM13 *= fInvLength; |
---|
| 357 | float fQ = 2.0*fM12*fM23+fM13*(fM33-fM22); |
---|
| 358 | |
---|
| 359 | m_afDiag[2] = fM22+fM13*fQ; |
---|
| 360 | m_afDiag[3] = fM33-fM13*fQ; |
---|
| 361 | m_afSubd[1] = fLength; |
---|
| 362 | m_afSubd[2] = fM23-fM12*fQ; |
---|
| 363 | m_aafMat[1][2] = 0.0; |
---|
| 364 | m_aafMat[1][3] = 0.0; |
---|
| 365 | m_aafMat[2][2] = fM12; |
---|
| 366 | m_aafMat[2][3] = fM13; |
---|
| 367 | m_aafMat[3][2] = fM13; |
---|
| 368 | m_aafMat[3][3] = -fM12; |
---|
| 369 | } |
---|
| 370 | else |
---|
| 371 | { |
---|
| 372 | m_afDiag[2] = fM22; |
---|
| 373 | m_afDiag[3] = fM33; |
---|
| 374 | m_afSubd[1] = fM12; |
---|
| 375 | m_afSubd[2] = fM23; |
---|
| 376 | m_aafMat[1][2] = 0.0; |
---|
| 377 | m_aafMat[1][3] = 0.0; |
---|
| 378 | m_aafMat[2][2] = 1.0; |
---|
| 379 | m_aafMat[2][3] = 0.0; |
---|
| 380 | m_aafMat[3][2] = 0.0; |
---|
| 381 | m_aafMat[3][3] = 1.0; |
---|
| 382 | } |
---|
| 383 | } |
---|
| 384 | } |
---|
| 385 | //--------------------------------------------------------------------------- |
---|
| 386 | void Eigen::TridiagonalN (int iSize, float** m_aafMat, |
---|
| 387 | float* m_afDiag, float* m_afSubd) |
---|
| 388 | { |
---|
| 389 | int i0, i1, i2, i3; |
---|
| 390 | |
---|
| 391 | for (i0 = iSize-1, i3 = iSize-2; i0 >= 1; i0--, i3--) |
---|
| 392 | { |
---|
| 393 | float fH = 0.0, fScale = 0.0; |
---|
| 394 | |
---|
| 395 | if ( i3 > 0 ) |
---|
| 396 | { |
---|
| 397 | for (i2 = 0; i2 <= i3; i2++) |
---|
| 398 | fScale += Math::abs(m_aafMat[i0][i2]); |
---|
| 399 | if ( fScale == 0 ) |
---|
| 400 | { |
---|
| 401 | m_afSubd[i0] = m_aafMat[i0][i3]; |
---|
| 402 | } |
---|
| 403 | else |
---|
| 404 | { |
---|
| 405 | float fInvScale = 1.0/fScale; |
---|
| 406 | for (i2 = 0; i2 <= i3; i2++) |
---|
| 407 | { |
---|
| 408 | m_aafMat[i0][i2] *= fInvScale; |
---|
| 409 | fH += m_aafMat[i0][i2]*m_aafMat[i0][i2]; |
---|
| 410 | } |
---|
| 411 | float fF = m_aafMat[i0][i3]; |
---|
| 412 | float fG = Math::sqrt(fH); |
---|
| 413 | if ( fF > 0.0 ) |
---|
| 414 | fG = -fG; |
---|
| 415 | m_afSubd[i0] = fScale*fG; |
---|
| 416 | fH -= fF*fG; |
---|
| 417 | m_aafMat[i0][i3] = fF-fG; |
---|
| 418 | fF = 0.0; |
---|
| 419 | float fInvH = 1.0/fH; |
---|
| 420 | for (i1 = 0; i1 <= i3; i1++) |
---|
| 421 | { |
---|
| 422 | m_aafMat[i1][i0] = m_aafMat[i0][i1]*fInvH; |
---|
| 423 | fG = 0.0; |
---|
| 424 | for (i2 = 0; i2 <= i1; i2++) |
---|
| 425 | fG += m_aafMat[i1][i2]*m_aafMat[i0][i2]; |
---|
| 426 | for (i2 = i1+1; i2 <= i3; i2++) |
---|
| 427 | fG += m_aafMat[i2][i1]*m_aafMat[i0][i2]; |
---|
| 428 | m_afSubd[i1] = fG*fInvH; |
---|
| 429 | fF += m_afSubd[i1]*m_aafMat[i0][i1]; |
---|
| 430 | } |
---|
| 431 | float fHalfFdivH = 0.5*fF*fInvH; |
---|
| 432 | for (i1 = 0; i1 <= i3; i1++) |
---|
| 433 | { |
---|
| 434 | fF = m_aafMat[i0][i1]; |
---|
| 435 | fG = m_afSubd[i1] - fHalfFdivH*fF; |
---|
| 436 | m_afSubd[i1] = fG; |
---|
| 437 | for (i2 = 0; i2 <= i1; i2++) |
---|
| 438 | { |
---|
| 439 | m_aafMat[i1][i2] -= fF*m_afSubd[i2] + |
---|
| 440 | fG*m_aafMat[i0][i2]; |
---|
| 441 | } |
---|
| 442 | } |
---|
| 443 | } |
---|
| 444 | } |
---|
| 445 | else |
---|
| 446 | { |
---|
| 447 | m_afSubd[i0] = m_aafMat[i0][i3]; |
---|
| 448 | } |
---|
| 449 | |
---|
| 450 | m_afDiag[i0] = fH; |
---|
| 451 | } |
---|
| 452 | |
---|
| 453 | m_afDiag[0] = m_afSubd[0] = 0; |
---|
| 454 | for (i0 = 0, i3 = -1; i0 <= iSize-1; i0++, i3++) |
---|
| 455 | { |
---|
| 456 | if ( m_afDiag[i0] ) |
---|
| 457 | { |
---|
| 458 | for (i1 = 0; i1 <= i3; i1++) |
---|
| 459 | { |
---|
| 460 | float fSum = 0; |
---|
| 461 | for (i2 = 0; i2 <= i3; i2++) |
---|
| 462 | fSum += m_aafMat[i0][i2]*m_aafMat[i2][i1]; |
---|
| 463 | for (i2 = 0; i2 <= i3; i2++) |
---|
| 464 | m_aafMat[i2][i1] -= fSum*m_aafMat[i2][i0]; |
---|
| 465 | } |
---|
| 466 | } |
---|
| 467 | m_afDiag[i0] = m_aafMat[i0][i0]; |
---|
| 468 | m_aafMat[i0][i0] = 1; |
---|
| 469 | for (i1 = 0; i1 <= i3; i1++) |
---|
| 470 | m_aafMat[i1][i0] = m_aafMat[i0][i1] = 0; |
---|
| 471 | } |
---|
| 472 | |
---|
| 473 | // re-ordering if Eigen::QLAlgorithm is used subsequently |
---|
| 474 | for (i0 = 1, i3 = 0; i0 < iSize; i0++, i3++) |
---|
| 475 | m_afSubd[i3] = m_afSubd[i0]; |
---|
| 476 | m_afSubd[iSize-1] = 0; |
---|
| 477 | } |
---|
| 478 | //--------------------------------------------------------------------------- |
---|
| 479 | bool Eigen::QLAlgorithm (int iSize, float* m_afDiag, float* m_afSubd, |
---|
| 480 | float** m_aafMat) |
---|
| 481 | { |
---|
| 482 | const int iMaxIter = 32; |
---|
| 483 | |
---|
| 484 | for (int i0 = 0; i0 < iSize; i0++) |
---|
| 485 | { |
---|
| 486 | int i1; |
---|
| 487 | for (i1 = 0; i1 < iMaxIter; i1++) |
---|
| 488 | { |
---|
| 489 | int i2; |
---|
| 490 | for (i2 = i0; i2 <= iSize-2; i2++) |
---|
| 491 | { |
---|
| 492 | float fTmp = |
---|
| 493 | Math::abs(m_afDiag[i2])+ Math::abs(m_afDiag[i2+1]); |
---|
| 494 | if ( Math::abs(m_afSubd[i2]) + fTmp == fTmp ) |
---|
| 495 | break; |
---|
| 496 | } |
---|
| 497 | if ( i2 == i0 ) |
---|
| 498 | break; |
---|
| 499 | |
---|
| 500 | float fG = (m_afDiag[i0+1]-m_afDiag[i0])/(2.0*m_afSubd[i0]); |
---|
| 501 | float fR = Math::sqrt(fG*fG+1.0); |
---|
| 502 | if ( fG < 0.0 ) |
---|
| 503 | fG = m_afDiag[i2]-m_afDiag[i0]+m_afSubd[i0]/(fG-fR); |
---|
| 504 | else |
---|
| 505 | fG = m_afDiag[i2]-m_afDiag[i0]+m_afSubd[i0]/(fG+fR); |
---|
| 506 | float fSin = 1.0, fCos = 1.0, fP = 0.0; |
---|
| 507 | for (int i3 = i2-1; i3 >= i0; i3--) |
---|
| 508 | { |
---|
| 509 | float fF = fSin*m_afSubd[i3]; |
---|
| 510 | float fB = fCos*m_afSubd[i3]; |
---|
| 511 | if ( Math::abs(fF) >= Math::abs(fG) ) |
---|
| 512 | { |
---|
| 513 | fCos = fG/fF; |
---|
| 514 | fR = sqrt(fCos*fCos+1.0); |
---|
| 515 | m_afSubd[i3+1] = fF*fR; |
---|
| 516 | fSin = 1.0/fR; |
---|
| 517 | fCos *= fSin; |
---|
| 518 | } |
---|
| 519 | else |
---|
| 520 | { |
---|
| 521 | fSin = fF/fG; |
---|
| 522 | fR = Math::sqrt(fSin*fSin+1.0); |
---|
| 523 | m_afSubd[i3+1] = fG*fR; |
---|
| 524 | fCos = 1.0/fR; |
---|
| 525 | fSin *= fCos; |
---|
| 526 | } |
---|
| 527 | fG = m_afDiag[i3+1]-fP; |
---|
| 528 | fR = (m_afDiag[i3]-fG)*fSin+2.0*fB*fCos; |
---|
| 529 | fP = fSin*fR; |
---|
| 530 | m_afDiag[i3+1] = fG+fP; |
---|
| 531 | fG = fCos*fR-fB; |
---|
| 532 | |
---|
| 533 | for (int i4 = 0; i4 < iSize; i4++) |
---|
| 534 | { |
---|
| 535 | fF = m_aafMat[i4][i3+1]; |
---|
| 536 | m_aafMat[i4][i3+1] = fSin*m_aafMat[i4][i3]+fCos*fF; |
---|
| 537 | m_aafMat[i4][i3] = fCos*m_aafMat[i4][i3]-fSin*fF; |
---|
| 538 | } |
---|
| 539 | } |
---|
| 540 | m_afDiag[i0] -= fP; |
---|
| 541 | m_afSubd[i0] = fG; |
---|
| 542 | m_afSubd[i2] = 0.0; |
---|
| 543 | } |
---|
| 544 | if ( i1 == iMaxIter ) |
---|
| 545 | return false; |
---|
| 546 | } |
---|
| 547 | |
---|
| 548 | return true; |
---|
| 549 | } |
---|
| 550 | //--------------------------------------------------------------------------- |
---|
| 551 | void Eigen::DecreasingSort (int iSize, float* afEigval, |
---|
| 552 | float** aafEigvec) |
---|
| 553 | { |
---|
| 554 | // sort eigenvalues in decreasing order, e[0] >= ... >= e[iSize-1] |
---|
| 555 | for (int i0 = 0, i1; i0 <= iSize-2; i0++) |
---|
| 556 | { |
---|
| 557 | // locate maximum eigenvalue |
---|
| 558 | i1 = i0; |
---|
| 559 | float fMax = afEigval[i1]; |
---|
| 560 | int i2; |
---|
| 561 | for (i2 = i0+1; i2 < iSize; i2++) |
---|
| 562 | { |
---|
| 563 | if ( afEigval[i2] > fMax ) |
---|
| 564 | { |
---|
| 565 | i1 = i2; |
---|
| 566 | fMax = afEigval[i1]; |
---|
| 567 | } |
---|
| 568 | } |
---|
| 569 | |
---|
| 570 | if ( i1 != i0 ) |
---|
| 571 | { |
---|
| 572 | // swap eigenvalues |
---|
| 573 | afEigval[i1] = afEigval[i0]; |
---|
| 574 | afEigval[i0] = fMax; |
---|
| 575 | |
---|
| 576 | // swap eigenvectors |
---|
| 577 | for (i2 = 0; i2 < iSize; i2++) |
---|
| 578 | { |
---|
| 579 | float fTmp = aafEigvec[i2][i0]; |
---|
| 580 | aafEigvec[i2][i0] = aafEigvec[i2][i1]; |
---|
| 581 | aafEigvec[i2][i1] = fTmp; |
---|
| 582 | } |
---|
| 583 | } |
---|
| 584 | } |
---|
| 585 | } |
---|
| 586 | //--------------------------------------------------------------------------- |
---|
| 587 | void Eigen::IncreasingSort (int iSize, float* afEigval, |
---|
| 588 | float** aafEigvec) |
---|
| 589 | { |
---|
| 590 | // sort eigenvalues in increasing order, e[0] <= ... <= e[iSize-1] |
---|
| 591 | for (int i0 = 0, i1; i0 <= iSize-2; i0++) |
---|
| 592 | { |
---|
| 593 | // locate minimum eigenvalue |
---|
| 594 | i1 = i0; |
---|
| 595 | float fMin = afEigval[i1]; |
---|
| 596 | int i2; |
---|
| 597 | for (i2 = i0+1; i2 < iSize; i2++) |
---|
| 598 | { |
---|
| 599 | if ( afEigval[i2] < fMin ) |
---|
| 600 | { |
---|
| 601 | i1 = i2; |
---|
| 602 | fMin = afEigval[i1]; |
---|
| 603 | } |
---|
| 604 | } |
---|
| 605 | |
---|
| 606 | if ( i1 != i0 ) |
---|
| 607 | { |
---|
| 608 | // swap eigenvalues |
---|
| 609 | afEigval[i1] = afEigval[i0]; |
---|
| 610 | afEigval[i0] = fMin; |
---|
| 611 | |
---|
| 612 | // swap eigenvectors |
---|
| 613 | for (i2 = 0; i2 < iSize; i2++) |
---|
| 614 | { |
---|
| 615 | float fTmp = aafEigvec[i2][i0]; |
---|
| 616 | aafEigvec[i2][i0] = aafEigvec[i2][i1]; |
---|
| 617 | aafEigvec[i2][i1] = fTmp; |
---|
| 618 | } |
---|
| 619 | } |
---|
| 620 | } |
---|
| 621 | } |
---|
| 622 | //--------------------------------------------------------------------------- |
---|
| 623 | void Eigen::SetMatrix (float** aafMat) |
---|
| 624 | { |
---|
| 625 | for (int iRow = 0; iRow < m_iSize; iRow++) |
---|
| 626 | { |
---|
| 627 | for (int iCol = 0; iCol < m_iSize; iCol++) |
---|
| 628 | m_aafMat[iRow][iCol] = aafMat[iRow][iCol]; |
---|
| 629 | } |
---|
| 630 | } |
---|
| 631 | //--------------------------------------------------------------------------- |
---|
| 632 | void Eigen::EigenStuff2 () |
---|
| 633 | { |
---|
| 634 | Tridiagonal2(m_aafMat,m_afDiag,m_afSubd); |
---|
| 635 | QLAlgorithm(m_iSize,m_afDiag,m_afSubd,m_aafMat); |
---|
| 636 | } |
---|
| 637 | //--------------------------------------------------------------------------- |
---|
| 638 | void Eigen::EigenStuff3 () |
---|
| 639 | { |
---|
| 640 | Tridiagonal3(m_aafMat,m_afDiag,m_afSubd); |
---|
| 641 | QLAlgorithm(m_iSize,m_afDiag,m_afSubd,m_aafMat); |
---|
| 642 | } |
---|
| 643 | //--------------------------------------------------------------------------- |
---|
| 644 | void Eigen::EigenStuff4 () |
---|
| 645 | { |
---|
| 646 | Tridiagonal4(m_aafMat,m_afDiag,m_afSubd); |
---|
| 647 | QLAlgorithm(m_iSize,m_afDiag,m_afSubd,m_aafMat); |
---|
| 648 | } |
---|
| 649 | //--------------------------------------------------------------------------- |
---|
| 650 | void Eigen::EigenStuffN () |
---|
| 651 | { |
---|
| 652 | TridiagonalN(m_iSize,m_aafMat,m_afDiag,m_afSubd); |
---|
| 653 | QLAlgorithm(m_iSize,m_afDiag,m_afSubd,m_aafMat); |
---|
| 654 | } |
---|
| 655 | //--------------------------------------------------------------------------- |
---|
| 656 | void Eigen::EigenStuff () |
---|
| 657 | { |
---|
| 658 | switch ( m_iSize ) |
---|
| 659 | { |
---|
| 660 | case 2: |
---|
| 661 | Tridiagonal2(m_aafMat,m_afDiag,m_afSubd); |
---|
| 662 | break; |
---|
| 663 | case 3: |
---|
| 664 | Tridiagonal3(m_aafMat,m_afDiag,m_afSubd); |
---|
| 665 | break; |
---|
| 666 | case 4: |
---|
| 667 | Tridiagonal4(m_aafMat,m_afDiag,m_afSubd); |
---|
| 668 | break; |
---|
| 669 | default: |
---|
| 670 | TridiagonalN(m_iSize,m_aafMat,m_afDiag,m_afSubd); |
---|
| 671 | break; |
---|
| 672 | } |
---|
| 673 | QLAlgorithm(m_iSize,m_afDiag,m_afSubd,m_aafMat); |
---|
| 674 | } |
---|
| 675 | //--------------------------------------------------------------------------- |
---|
| 676 | void Eigen::DecrSortEigenStuff2 () |
---|
| 677 | { |
---|
| 678 | Tridiagonal2(m_aafMat,m_afDiag,m_afSubd); |
---|
| 679 | QLAlgorithm(m_iSize,m_afDiag,m_afSubd,m_aafMat); |
---|
| 680 | DecreasingSort(m_iSize,m_afDiag,m_aafMat); |
---|
| 681 | } |
---|
| 682 | //--------------------------------------------------------------------------- |
---|
| 683 | void Eigen::DecrSortEigenStuff3 () |
---|
| 684 | { |
---|
| 685 | Tridiagonal3(m_aafMat,m_afDiag,m_afSubd); |
---|
| 686 | QLAlgorithm(m_iSize,m_afDiag,m_afSubd,m_aafMat); |
---|
| 687 | DecreasingSort(m_iSize,m_afDiag,m_aafMat); |
---|
| 688 | } |
---|
| 689 | //--------------------------------------------------------------------------- |
---|
| 690 | void Eigen::DecrSortEigenStuff4 () |
---|
| 691 | { |
---|
| 692 | Tridiagonal4(m_aafMat,m_afDiag,m_afSubd); |
---|
| 693 | QLAlgorithm(m_iSize,m_afDiag,m_afSubd,m_aafMat); |
---|
| 694 | DecreasingSort(m_iSize,m_afDiag,m_aafMat); |
---|
| 695 | } |
---|
| 696 | //--------------------------------------------------------------------------- |
---|
| 697 | void Eigen::DecrSortEigenStuffN () |
---|
| 698 | { |
---|
| 699 | TridiagonalN(m_iSize,m_aafMat,m_afDiag,m_afSubd); |
---|
| 700 | QLAlgorithm(m_iSize,m_afDiag,m_afSubd,m_aafMat); |
---|
| 701 | DecreasingSort(m_iSize,m_afDiag,m_aafMat); |
---|
| 702 | } |
---|
| 703 | //--------------------------------------------------------------------------- |
---|
| 704 | void Eigen::DecrSortEigenStuff () |
---|
| 705 | { |
---|
| 706 | switch ( m_iSize ) |
---|
| 707 | { |
---|
| 708 | case 2: |
---|
| 709 | Tridiagonal2(m_aafMat,m_afDiag,m_afSubd); |
---|
| 710 | break; |
---|
| 711 | case 3: |
---|
| 712 | Tridiagonal3(m_aafMat,m_afDiag,m_afSubd); |
---|
| 713 | break; |
---|
| 714 | case 4: |
---|
| 715 | Tridiagonal4(m_aafMat,m_afDiag,m_afSubd); |
---|
| 716 | break; |
---|
| 717 | default: |
---|
| 718 | TridiagonalN(m_iSize,m_aafMat,m_afDiag,m_afSubd); |
---|
| 719 | break; |
---|
| 720 | } |
---|
| 721 | QLAlgorithm(m_iSize,m_afDiag,m_afSubd,m_aafMat); |
---|
| 722 | DecreasingSort(m_iSize,m_afDiag,m_aafMat); |
---|
| 723 | } |
---|
| 724 | //--------------------------------------------------------------------------- |
---|
| 725 | void Eigen::IncrSortEigenStuff2 () |
---|
| 726 | { |
---|
| 727 | Tridiagonal2(m_aafMat,m_afDiag,m_afSubd); |
---|
| 728 | QLAlgorithm(m_iSize,m_afDiag,m_afSubd,m_aafMat); |
---|
| 729 | IncreasingSort(m_iSize,m_afDiag,m_aafMat); |
---|
| 730 | } |
---|
| 731 | //--------------------------------------------------------------------------- |
---|
| 732 | void Eigen::IncrSortEigenStuff3 () |
---|
| 733 | { |
---|
| 734 | Tridiagonal3(m_aafMat,m_afDiag,m_afSubd); |
---|
| 735 | QLAlgorithm(m_iSize,m_afDiag,m_afSubd,m_aafMat); |
---|
| 736 | IncreasingSort(m_iSize,m_afDiag,m_aafMat); |
---|
| 737 | } |
---|
| 738 | //--------------------------------------------------------------------------- |
---|
| 739 | void Eigen::IncrSortEigenStuff4 () |
---|
| 740 | { |
---|
| 741 | Tridiagonal4(m_aafMat,m_afDiag,m_afSubd); |
---|
| 742 | QLAlgorithm(m_iSize,m_afDiag,m_afSubd,m_aafMat); |
---|
| 743 | IncreasingSort(m_iSize,m_afDiag,m_aafMat); |
---|
| 744 | } |
---|
| 745 | //--------------------------------------------------------------------------- |
---|
| 746 | void Eigen::IncrSortEigenStuffN () |
---|
| 747 | { |
---|
| 748 | TridiagonalN(m_iSize,m_aafMat,m_afDiag,m_afSubd); |
---|
| 749 | QLAlgorithm(m_iSize,m_afDiag,m_afSubd,m_aafMat); |
---|
| 750 | IncreasingSort(m_iSize,m_afDiag,m_aafMat); |
---|
| 751 | } |
---|
| 752 | //--------------------------------------------------------------------------- |
---|
| 753 | void Eigen::IncrSortEigenStuff () |
---|
| 754 | { |
---|
| 755 | switch ( m_iSize ) |
---|
| 756 | { |
---|
| 757 | case 2: |
---|
| 758 | Tridiagonal2(m_aafMat,m_afDiag,m_afSubd); |
---|
| 759 | break; |
---|
| 760 | case 3: |
---|
| 761 | Tridiagonal3(m_aafMat,m_afDiag,m_afSubd); |
---|
| 762 | break; |
---|
| 763 | case 4: |
---|
| 764 | Tridiagonal4(m_aafMat,m_afDiag,m_afSubd); |
---|
| 765 | break; |
---|
| 766 | default: |
---|
| 767 | TridiagonalN(m_iSize,m_aafMat,m_afDiag,m_afSubd); |
---|
| 768 | break; |
---|
| 769 | } |
---|
| 770 | QLAlgorithm(m_iSize,m_afDiag,m_afSubd,m_aafMat); |
---|
| 771 | IncreasingSort(m_iSize,m_afDiag,m_aafMat); |
---|
| 772 | } |
---|
| 773 | //--------------------------------------------------------------------------- |
---|
| 774 | |
---|
| 775 | }; |
---|
| 776 | |
---|
| 777 | |
---|
| 778 | /* |
---|
| 779 | #ifdef EIGEN_TEST |
---|
| 780 | |
---|
| 781 | int main () |
---|
| 782 | { |
---|
| 783 | Eigen kES(3); |
---|
| 784 | |
---|
| 785 | kES.Matrix(0,0) = 2.0; kES.Matrix(0,1) = 1.0; kES.Matrix(0,2) = 1.0; |
---|
| 786 | kES.Matrix(1,0) = 1.0; kES.Matrix(1,1) = 2.0; kES.Matrix(1,2) = 1.0; |
---|
| 787 | kES.Matrix(2,0) = 1.0; kES.Matrix(2,1) = 1.0; kES.Matrix(2,2) = 2.0; |
---|
| 788 | |
---|
| 789 | kES.IncrSortEigenStuff3(); |
---|
| 790 | |
---|
| 791 | cout.setf(ios::fixed); |
---|
| 792 | |
---|
| 793 | cout << "eigenvalues = " << endl; |
---|
| 794 | int iRow; |
---|
| 795 | for (iRow = 0; iRow < 3; iRow++) |
---|
| 796 | cout << kES.GetEigenvalue(iRow) << ' '; |
---|
| 797 | cout << endl; |
---|
| 798 | |
---|
| 799 | cout << "eigenvectors = " << endl; |
---|
| 800 | for (iRow = 0; iRow < 3; iRow++) |
---|
| 801 | { |
---|
| 802 | for (int iCol = 0; iCol < 3; iCol++) |
---|
| 803 | cout << kES.GetEigenvector(iRow,iCol) << ' '; |
---|
| 804 | cout << endl; |
---|
| 805 | } |
---|
| 806 | |
---|
| 807 | // eigenvalues = |
---|
| 808 | // 1.000000 1.000000 4.000000 |
---|
| 809 | // eigenvectors = |
---|
| 810 | // 0.411953 0.704955 0.577350 |
---|
| 811 | // 0.404533 -0.709239 0.577350 |
---|
| 812 | // -0.816485 0.004284 0.577350 |
---|
| 813 | |
---|
| 814 | return 0; |
---|
| 815 | } |
---|
| 816 | |
---|
| 817 | #endif |
---|
| 818 | */ |
---|
| 819 | |
---|
| 820 | #endif |
---|