VMatrix.cc

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/*
 * VMatrix.cpp
 *
 *  Created on: Feb 15, 2012
 *      Author: kleinwrt
 */

 
#include "VMatrix.h"

namespace gbl {
 
/*********** simple Matrix based on std::vector<double> **********/
 
VMatrix::VMatrix(const unsigned int nRows, const unsigned int nCols) :
                numRows(nRows), numCols(nCols), theVec(nRows * nCols) {
}
 
VMatrix::VMatrix(const VMatrix &aMatrix) :
                numRows(aMatrix.numRows), numCols(aMatrix.numCols), theVec(
                                aMatrix.theVec) {
 
}
 
VMatrix::~VMatrix() {
}


void VMatrix::resize(const unsigned int nRows, const unsigned int nCols) {
        numRows = nRows;
        numCols = nCols;
        theVec.resize(nRows * nCols);
}


VMatrix VMatrix::transpose() const {
        VMatrix aResult(numCols, numRows);
        for (unsigned int i = 0; i < numRows; ++i) {
                for (unsigned int j = 0; j < numCols; ++j) {
                        aResult(j, i) = theVec[numCols * i + j];
                }
        }
        return aResult;
}


unsigned int VMatrix::getNumRows() const {
        return numRows;
}


unsigned int VMatrix::getNumCols() const {
        return numCols;
}

void VMatrix::print() const {
        std::cout << " VMatrix: " << numRows << "*" << numCols << std::endl;
        for (unsigned int i = 0; i < numRows; ++i) {
                for (unsigned int j = 0; j < numCols; ++j) {
                        if (j % 5 == 0) {
                                std::cout << std::endl << std::setw(4) << i << ","
                                                << std::setw(4) << j << "-" << std::setw(4)
                                                << std::min(j + 4, numCols) << ":";
                        }
                        std::cout << std::setw(13) << theVec[numCols * i + j];
                }
        }
        std::cout << std::endl << std::endl;
}

VVector VMatrix::operator*(const VVector &aVector) const {
        VVector aResult(numRows);
        for (unsigned int i = 0; i < this->numRows; ++i) {
                double sum = 0.0;
                for (unsigned int j = 0; j < this->numCols; ++j) {
                        sum += theVec[numCols * i + j] * aVector(j);
                }
                aResult(i) = sum;
        }
        return aResult;
}

VMatrix VMatrix::operator*(const VMatrix &aMatrix) const {
 
        VMatrix aResult(numRows, aMatrix.numCols);
        for (unsigned int i = 0; i < numRows; ++i) {
                for (unsigned int j = 0; j < aMatrix.numCols; ++j) {
                        double sum = 0.0;
                        for (unsigned int k = 0; k < numCols; ++k) {
                                sum += theVec[numCols * i + k] * aMatrix(k, j);
                        }
                        aResult(i, j) = sum;
                }
        }
        return aResult;
}

VMatrix VMatrix::operator+(const VMatrix &aMatrix) const {
        VMatrix aResult(numRows, numCols);
        for (unsigned int i = 0; i < numRows; ++i) {
                for (unsigned int j = 0; j < numCols; ++j) {
                        aResult(i, j) = theVec[numCols * i + j] + aMatrix(i, j);
                }
        }
        return aResult;
}

VMatrix &VMatrix::operator=(const VMatrix &aMatrix) {
        if (this != &aMatrix) {   // Gracefully handle self assignment
                numRows = aMatrix.getNumRows();
                numCols = aMatrix.getNumCols();
                theVec.resize(numRows * numCols);
                for (unsigned int i = 0; i < numRows; ++i) {
                        for (unsigned int j = 0; j < numCols; ++j) {
                                theVec[numCols * i + j] = aMatrix(i, j);
                        }
                }
        }
        return *this;
}
 
/*********** simple symmetric Matrix based on std::vector<double> **********/
 
VSymMatrix::VSymMatrix(const unsigned int nRows) :
                numRows(nRows), theVec((nRows * nRows + nRows) / 2) {
}
 
VSymMatrix::~VSymMatrix() {
}


void VSymMatrix::resize(const unsigned int nRows) {
        numRows = nRows;
        theVec.resize((nRows * nRows + nRows) / 2);
}


unsigned int VSymMatrix::getNumRows() const {
        return numRows;
}

void VSymMatrix::print() const {
        std::cout << " VSymMatrix: " << numRows << "*" << numRows << std::endl;
        for (unsigned int i = 0; i < numRows; ++i) {
                for (unsigned int j = 0; j <= i; ++j) {
                        if (j % 5 == 0) {
                                std::cout << std::endl << std::setw(4) << i << ","
                                                << std::setw(4) << j << "-" << std::setw(4)
                                                << std::min(j + 4, i) << ":";
                        }
                        std::cout << std::setw(13) << theVec[(i * i + i) / 2 + j];
                }
        }
        std::cout << std::endl << std::endl;
}

VSymMatrix VSymMatrix::operator-(const VMatrix &aMatrix) const {
        VSymMatrix aResult(numRows);
        for (unsigned int i = 0; i < numRows; ++i) {
                for (unsigned int j = 0; j <= i; ++j) {
                        aResult(i, j) = theVec[(i * i + i) / 2 + j] - aMatrix(i, j);
                }
        }
        return aResult;
}

VVector VSymMatrix::operator*(const VVector &aVector) const {
        VVector aResult(numRows);
        for (unsigned int i = 0; i < numRows; ++i) {
                aResult(i) = theVec[(i * i + i) / 2 + i] * aVector(i);
                for (unsigned int j = 0; j < i; ++j) {
                        aResult(j) += theVec[(i * i + i) / 2 + j] * aVector(i);
                        aResult(i) += theVec[(i * i + i) / 2 + j] * aVector(j);
                }
        }
        return aResult;
}

VMatrix VSymMatrix::operator*(const VMatrix &aMatrix) const {
        unsigned int nCol = aMatrix.getNumCols();
        VMatrix aResult(numRows, nCol);
        for (unsigned int l = 0; l < nCol; ++l) {
                for (unsigned int i = 0; i < numRows; ++i) {
                        aResult(i, l) = theVec[(i * i + i) / 2 + i] * aMatrix(i, l);
                        for (unsigned int j = 0; j < i; ++j) {
                                aResult(j, l) += theVec[(i * i + i) / 2 + j] * aMatrix(i, l);
                                aResult(i, l) += theVec[(i * i + i) / 2 + j] * aMatrix(j, l);
                        }
                }
        }
        return aResult;
}
 
/*********** simple Vector based on std::vector<double> **********/
 
VVector::VVector(const unsigned int nRows) :
                numRows(nRows), theVec(nRows) {
}
 
VVector::VVector(const VVector &aVector) :
                numRows(aVector.numRows), theVec(aVector.theVec) {
 
}
 
VVector::~VVector() {
}


void VVector::resize(const unsigned int nRows) {
        numRows = nRows;
        theVec.resize(nRows);
}


VVector VVector::getVec(unsigned int len, unsigned int start) const {
        VVector aResult(len);
        std::memcpy(&aResult.theVec[0], &theVec[start], sizeof(double) * len);
        return aResult;
}


void VVector::putVec(const VVector &aVector, unsigned int start) {
        std::memcpy(&theVec[start], &aVector.theVec[0],
                        sizeof(double) * aVector.numRows);
}


unsigned int VVector::getNumRows() const {
        return numRows;
}

void VVector::print() const {
        std::cout << " VVector: " << numRows << std::endl;
        for (unsigned int i = 0; i < numRows; ++i) {
 
                if (i % 5 == 0) {
                        std::cout << std::endl << std::setw(4) << i << "-" << std::setw(4)
                                        << std::min(i + 4, numRows) << ":";
                }
                std::cout << std::setw(13) << theVec[i];
        }
        std::cout << std::endl << std::endl;
}

VVector VVector::operator-(const VVector &aVector) const {
        VVector aResult(numRows);
        for (unsigned int i = 0; i < numRows; ++i) {
                aResult(i) = theVec[i] - aVector(i);
        }
        return aResult;
}

VVector &VVector::operator=(const VVector &aVector) {
        if (this != &aVector) {   // Gracefully handle self assignment
                numRows = aVector.getNumRows();
                theVec.resize(numRows);
                for (unsigned int i = 0; i < numRows; ++i) {
                        theVec[i] = aVector(i);
                }
        }
        return *this;
}
 
/*============================================================================
 from mpnum.F (MillePede-II by V. Blobel, Univ. Hamburg)
 ============================================================================*/

unsigned int VSymMatrix::invert() {
 
        const double eps = 1.0E-10;
        unsigned int aSize = numRows;
        std::vector<int> next(aSize);
        std::vector<double> diag(aSize);
        int nSize = aSize;
 
        int first = 1;
        for (int i = 1; i <= nSize; ++i) {
                next[i - 1] = i + 1; // set "next" pointer
                diag[i - 1] = fabs(theVec[(i * i + i) / 2 - 1]); // save abs of diagonal elements
        }
        next[aSize - 1] = -1; // end flag
 
        unsigned int nrank = 0;
        for (int i = 1; i <= nSize; ++i) { // start of loop
                int k = 0;
                double vkk = 0.0;
 
                int j = first;
                int previous = 0;
                int last = previous;
                // look for pivot
                while (j > 0) {
                        int jj = (j * j + j) / 2 - 1;
                        if (fabs(theVec[jj]) > std::max(fabs(vkk), eps * diag[j - 1])) {
                                vkk = theVec[jj];
                                k = j;
                                last = previous;
                        }
                        previous = j;
                        j = next[j - 1];
                }
                // pivot found
                if (k > 0) {
                        int kk = (k * k + k) / 2 - 1;
                        if (last <= 0) {
                                first = next[k - 1];
                        } else {
                                next[last - 1] = next[k - 1];
                        }
                        next[k - 1] = 0; // index is used, reset
                        nrank++; // increase rank and ...
 
                        vkk = 1.0 / vkk;
                        theVec[kk] = -vkk;
                        int jk = kk - k;
                        int jl = -1;
                        for (int m = 1; m <= nSize; ++m) { // elimination
                                if (m == k) {
                                        jk = kk;
                                        jl += m;
                                } else {
                                        if (m < k) {
                                                ++jk;
                                        } else {
                                                jk += m - 1;
                                        }
 
                                        double vjk = theVec[jk];
                                        theVec[jk] = vkk * vjk;
                                        int lk = kk - k;
                                        if (m >= k) {
                                                for (int l = 1; l <= k - 1; ++l) {
                                                        ++jl;
                                                        ++lk;
                                                        theVec[jl] -= theVec[lk] * vjk;
                                                }
                                                ++jl;
                                                lk = kk;
                                                for (int l = k + 1; l <= m; ++l) {
                                                        ++jl;
                                                        lk += l - 1;
                                                        theVec[jl] -= theVec[lk] * vjk;
                                                }
                                        } else {
                                                for (int l = 1; l <= m; ++l) {
                                                        ++jl;
                                                        ++lk;
                                                        theVec[jl] -= theVec[lk] * vjk;
                                                }
                                        }
                                }
                        }
                } else {
                        for (int m = 1; m <= nSize; ++m) {
                                if (next[m - 1] >= 0) {
                                        int kk = (m * m - m) / 2 - 1;
                                        for (int n = 1; n <= nSize; ++n) {
                                                if (next[n - 1] >= 0) {
                                                        theVec[kk + n] = 0.0; // clear matrix row/col
                                                }
                                        }
                                }
                        }
                        throw 1; // singular
                }
        }
        for (int ij = 0; ij < (nSize * nSize + nSize) / 2; ++ij) {
                theVec[ij] = -theVec[ij]; // finally reverse sign of all matrix elements
        }
        return nrank;
}
}