cmat.h
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上传日期:2013-10-12
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- // Template Numerical Toolkit (TNT) for Linear Algebra
- //
- // BETA VERSION INCOMPLETE AND SUBJECT TO CHANGE
- // Please see http://math.nist.gov/tnt for updates
- //
- // R. Pozo
- // Mathematical and Computational Sciences Division
- // National Institute of Standards and Technology
- // C compatible matrix: row-oriented, 0-based [i][j] and 1-based (i,j) indexing
- //
- #ifndef CMAT_H
- #define CMAT_H
- #include "subscrpt.h"
- #include "vec.h"
- #include <stdlib.h>
- #include <assert.h>
- #include <iostream.h>
- #include <strstream.h>
- #ifdef TNT_USE_REGIONS
- #include "region2d.h"
- #endif
- template <class T>
- class C_matrix
- {
- public:
- typedef Subscript size_type;
- typedef T value_type;
- typedef T element_type;
- typedef T* pointer;
- typedef T* iterator;
- typedef T& reference;
- typedef const T* const_iterator;
- typedef const T& const_reference;
- Subscript lbound() const { return 1;}
-
- protected:
- Subscript m_;
- Subscript n_;
- Subscript mn_; // total size
- T* v_;
- T** row_;
- T* vm1_ ; // these point to the same data, but are 1-based
- T** rowm1_;
- // internal helper function to create the array
- // of row pointers
- void initialize(Subscript M, Subscript N)
- {
- mn_ = M*N;
- m_ = M;
- n_ = N;
- v_ = new T[mn_];
- row_ = new T*[M];
- rowm1_ = new T*[M];
- assert(v_ != NULL);
- assert(row_ != NULL);
- assert(rowm1_ != NULL);
- T* p = v_;
- vm1_ = v_ - 1;
- for (Subscript i=0; i<M; i++)
- {
- row_[i] = p;
- rowm1_[i] = p-1;
- p += N ;
-
- }
- rowm1_ -- ; // compensate for 1-based offset
- }
-
- void copy(const T* v)
- {
- Subscript N = m_ * n_;
- Subscript i;
- #ifdef TNT_UNROLL
- Subscript Nmod4 = N & 4;
- Subscript N4 = N - Nmod4;
- for (i=0; i<N4; i+=4)
- {
- v_[i] = v[i];
- v_[i+1] = v[i+1];
- v_[i+2] = v[i+2];
- v_[i+3] = v[i+3];
- }
- for (i=N4; i< N; i++)
- v_[i] = v[i];
- #else
- for (i=0; i< N; i++)
- v_[i] = v[i];
- #endif
- }
- void set(const T& val)
- {
- Subscript N = m_ * n_;
- Subscript i;
- #ifdef TNT_UNROLL
- Subscript Nmod4 = N & 4;
- Subscript N4 = N - Nmod4;
- for (i=0; i<N4; i+=4)
- {
- v_[i] = val;
- v_[i+1] = val;
- v_[i+2] = val;
- v_[i+3] = val;
- }
- for (i=N4; i< N; i++)
- v_[i] = val;
- #else
- for (i=0; i< N; i++)
- v_[i] = val;
-
- #endif
- }
-
-
- void destroy()
- {
- /* do nothing, if no memory has been previously allocated */
- if (v_ == NULL) return ;
- /* if we are here, then matrix was previously allocated */
- if (v_ != NULL) delete [] (v_);
- if (row_ != NULL) delete [] (row_);
- /* return rowm1_ back to original value */
- rowm1_ ++;
- if (rowm1_ != NULL ) delete [] (rowm1_);
- }
- public:
- operator T**(){ return row_; }
- operator T**() const { return row_; }
- Subscript size() const { return mn_; }
- // constructors
- C_matrix() : m_(0), n_(0), mn_(0), v_(0), row_(0), vm1_(0), rowm1_(0) {};
- C_matrix(const C_matrix<T> &A)
- {
- initialize(A.m_, A.n_);
- copy(A.v_);
- }
- C_matrix(Subscript M, Subscript N, const T& value = T(0))
- {
- initialize(M,N);
- set(value);
- }
- C_matrix(Subscript M, Subscript N, const T* v)
- {
- initialize(M,N);
- copy(v);
- }
- C_matrix(Subscript M, Subscript N, char *s)
- {
- initialize(M,N);
- istrstream ins(s);
- Subscript i, j;
- for (i=0; i<M; i++)
- for (j=0; j<N; j++)
- ins >> row_[i][j];
- }
- // destructor
- //
- ~C_matrix()
- {
- destroy();
- }
- // reallocating
- //
- C_matrix<T>& newsize(Subscript M, Subscript N)
- {
- if (num_rows() == M && num_cols() == N)
- return *this;
- destroy();
- initialize(M,N);
-
- return *this;
- }
- // assignments
- //
- C_matrix<T>& operator=(const C_matrix<T> &A)
- {
- if (v_ == A.v_)
- return *this;
- if (m_ == A.m_ && n_ == A.n_) // no need to re-alloc
- copy(A.v_);
- else
- {
- destroy();
- initialize(A.m_, A.n_);
- copy(A.v_);
- }
- return *this;
- }
-
- C_matrix<T>& operator=(const T& scalar)
- {
- set(scalar);
- return *this;
- }
- Subscript dim(Subscript d) const
- {
- #ifdef TNT_BOUNDS_CHECK
- assert( d >= 1);
- assert( d <= 2);
- #endif
- return (d==1) ? m_ : ((d==2) ? n_ : 0);
- }
- Subscript num_rows() const { return m_; }
- Subscript num_cols() const { return n_; }
- inline T* operator[](Subscript i)
- {
- #ifdef TNT_BOUNDS_CHECK
- assert(0<=i);
- assert(i < m_) ;
- #endif
- return row_[i];
- }
- inline const T* operator[](Subscript i) const
- {
- #ifdef TNT_BOUNDS_CHECK
- assert(0<=i);
- assert(i < m_) ;
- #endif
- return row_[i];
- }
- inline reference operator()(Subscript i)
- {
- #ifdef TNT_BOUNDS_CHECK
- assert(1<=i);
- assert(i <= mn_) ;
- #endif
- return vm1_[i];
- }
- inline const_reference operator()(Subscript i) const
- {
- #ifdef TNT_BOUNDS_CHECK
- assert(1<=i);
- assert(i <= mn_) ;
- #endif
- return vm1_[i];
- }
- inline reference operator()(Subscript i, Subscript j)
- {
- #ifdef TNT_BOUNDS_CHECK
- assert(1<=i);
- assert(i <= m_) ;
- assert(1<=j);
- assert(j <= n_);
- #endif
- return rowm1_[i][j];
- }
-
- inline const_reference operator() (Subscript i, Subscript j) const
- {
- #ifdef TNT_BOUNDS_CHECK
- assert(1<=i);
- assert(i <= m_) ;
- assert(1<=j);
- assert(j <= n_);
- #endif
- return rowm1_[i][j];
- }
- friend istream& operator>>(istream &s, C_matrix<T> &A);
- #ifdef TNT_USE_REGIONS
- typedef Region2D<C_matrix<T> > Region;
-
- Region operator()(const Index1D &I, const Index1D &J)
- {
- return Region(*this, I,J);
- }
- typedef const_Region2D<C_matrix<T>,T > const_Region;
- const_Region operator()(const Index1D &I, const Index1D &J) const
- {
- return const_Region(*this, I,J);
- }
- #endif
- };
- /* *************************** I/O ********************************/
- template <class T>
- ostream& operator<<(ostream &s, const C_matrix<T> &A)
- {
- Subscript M=A.num_rows();
- Subscript N=A.num_cols();
- s << M << " " << N << endl;
- for (Subscript i=0; i<M; i++)
- {
- for (Subscript j=0; j<N; j++)
- {
- s << A[i][j] << " ";
- }
- s << endl;
- }
- return s;
- }
- template <class T>
- istream& operator>>(istream &s, C_matrix<T> &A)
- {
- Subscript M, N;
- s >> M >> N;
- if ( !(M == A.m_ && N == A.n_) )
- {
- A.destroy();
- A.initialize(M,N);
- }
- for (Subscript i=0; i<M; i++)
- for (Subscript j=0; j<N; j++)
- {
- s >> A[i][j];
- }
- return s;
- }
- //*******************[ basic matrix algorithms ]***************************
- template <class T>
- C_matrix<T> operator+(const C_matrix<T> &A,
- const C_matrix<T> &B)
- {
- Subscript M = A.num_rows();
- Subscript N = A.num_cols();
- assert(M==B.num_rows());
- assert(N==B.num_cols());
- C_matrix<T> tmp(M,N);
- Subscript i,j;
- for (i=0; i<M; i++)
- for (j=0; j<N; j++)
- tmp[i][j] = A[i][j] + B[i][j];
- return tmp;
- }
- template <class T>
- C_matrix<T> operator-(const C_matrix<T> &A,
- const C_matrix<T> &B)
- {
- Subscript M = A.num_rows();
- Subscript N = A.num_cols();
- assert(M==B.num_rows());
- assert(N==B.num_cols());
- C_matrix<T> tmp(M,N);
- Subscript i,j;
- for (i=0; i<M; i++)
- for (j=0; j<N; j++)
- tmp[i][j] = A[i][j] - B[i][j];
- return tmp;
- }
- template <class T>
- C_matrix<T> mult_element(const C_matrix<T> &A,
- const C_matrix<T> &B)
- {
- Subscript M = A.num_rows();
- Subscript N = A.num_cols();
- assert(M==B.num_rows());
- assert(N==B.num_cols());
- C_matrix<T> tmp(M,N);
- Subscript i,j;
- for (i=0; i<M; i++)
- for (j=0; j<N; j++)
- tmp[i][j] = A[i][j] * B[i][j];
- return tmp;
- }
- template <class T>
- C_matrix<T> transpose(const C_matrix<T> &A)
- {
- Subscript M = A.num_rows();
- Subscript N = A.num_cols();
- C_matrix<T> S(N,M);
- Subscript i, j;
- for (i=0; i<M; i++)
- for (j=0; j<N; j++)
- S[j][i] = A[i][j];
- return S;
- }
-
- template <class T>
- inline C_matrix<T> matmult(const C_matrix<T> &A,
- const C_matrix<T> &B)
- {
- #ifdef TNT_BOUNDS_CHECK
- assert(A.num_cols() == B.num_rows());
- #endif
- Subscript M = A.num_rows();
- Subscript N = A.num_cols();
- Subscript K = B.num_cols();
- C_matrix<T> tmp(M,K);
- T sum;
- for (Subscript i=0; i<M; i++)
- for (Subscript k=0; k<K; k++)
- {
- sum = 0;
- for (Subscript j=0; j<N; j++)
- sum = sum + A[i][j] * B[j][k];
- tmp[i][k] = sum;
- }
- return tmp;
- }
- template <class T>
- inline C_matrix<T> operator*(const C_matrix<T> &A,
- const C_matrix<T> &B)
- {
- return matmult(A,B);
- }
- template <class T>
- inline C_matrix<T> matmult(const C_matrix<T> &A, const T &b)
- {
- Subscript M = A.num_rows();
- Subscript N = A.num_cols();
- C_matrix<T> tmp(M,N);
- for (Subscript i=0; i<M; i++)
- for (Subscript j=0; j<N; j++)
- {
- tmp[i][j] = A[i][j] * b;
- }
- return tmp;
- }
- template <class T>
- inline C_matrix<T> operator*(const C_matrix<T> &A, const T &b)
- {
- return matmult(A,b);
- }
- template <class T>
- inline int matmult(C_matrix<T>& C, const C_matrix<T> &A,
- const C_matrix<T> &B)
- {
- assert(A.num_cols() == B.num_rows());
- Subscript M = A.num_rows();
- Subscript N = A.num_cols();
- Subscript K = B.num_cols();
- C.newsize(M,K);
- T sum;
- const T* row_i;
- const T* col_k;
- for (Subscript i=0; i<M; i++)
- for (Subscript k=0; k<K; k++)
- {
- row_i = &(A[i][0]);
- col_k = &(B[0][k]);
- sum = 0;
- for (Subscript j=0; j<N; j++)
- {
- sum += *row_i * *col_k;
- row_i++;
- col_k += K;
- }
- C[i][k] = sum;
- }
- return 0;
- }
- template <class T>
- Vector<T> matmult(const C_matrix<T> &A, const Vector<T> &x)
- {
- #ifdef TNT_BOUNDS_CHECK
- assert(A.num_cols() == x.dim());
- #endif
- Subscript M = A.num_rows();
- Subscript N = A.num_cols();
- Vector<T> tmp(M);
- T sum;
- for (Subscript i=0; i<M; i++)
- {
- sum = 0;
- const T* rowi = A[i];
- for (Subscript j=0; j<N; j++)
- sum = sum + rowi[j] * x[j];
- tmp[i] = sum;
- }
- return tmp;
- }
- template <class T>
- inline Vector<T> operator*(const C_matrix<T> &A, const Vector<T> &x)
- {
- return matmult(A,x);
- }
- #endif
- template <class T>
- C_matrix<T> outer_prod(const Vector<T> &a, const Vector<T> &b)
- {
- #ifdef TNT_BOUNDS_CHECK
- assert(a.dim() == b.dim());
- #endif
- Subscript N = a.dim();
- C_matrix<T> tmp(N,N);
- for (Subscript i=0; i<N; i++) {
- tmp[i][i] = a[i] * b[i];
- for (Subscript j=i+1; j<N; j++) {
- tmp[i][j] = tmp[j][i] = a[i] * b[j];
- }
- }
- return tmp;
- }
- // CMAT_H