* Implementation of symbolic matrices */
/*
- * GiNaC Copyright (C) 1999-2000 Johannes Gutenberg University Mainz, Germany
+ * GiNaC Copyright (C) 1999-2001 Johannes Gutenberg University Mainz, Germany
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
#include "archive.h"
#include "numeric.h"
#include "lst.h"
+#include "idx.h"
+#include "indexed.h"
#include "utils.h"
#include "debugmsg.h"
#include "power.h"
#include "symbol.h"
#include "normal.h"
-#ifndef NO_NAMESPACE_GINAC
namespace GiNaC {
-#endif // ndef NO_NAMESPACE_GINAC
GINAC_IMPLEMENT_REGISTERED_CLASS(matrix, basic)
//////////
-// default constructor, destructor, copy constructor, assignment operator
-// and helpers:
+// default ctor, dtor, copy ctor, assignment operator and helpers:
//////////
// public
/** Default ctor. Initializes to 1 x 1-dimensional zero-matrix. */
matrix::matrix() : inherited(TINFO_matrix), row(1), col(1)
{
- debugmsg("matrix default constructor",LOGLEVEL_CONSTRUCT);
+ debugmsg("matrix default ctor",LOGLEVEL_CONSTRUCT);
m.push_back(_ex0());
}
-matrix::~matrix()
-{
- debugmsg("matrix destructor",LOGLEVEL_DESTRUCT);
- destroy(false);
-}
-
-matrix::matrix(const matrix & other)
-{
- debugmsg("matrix copy constructor",LOGLEVEL_CONSTRUCT);
- copy(other);
-}
-
-const matrix & matrix::operator=(const matrix & other)
-{
- debugmsg("matrix operator=",LOGLEVEL_ASSIGNMENT);
- if (this != &other) {
- destroy(true);
- copy(other);
- }
- return *this;
-}
-
// protected
+/** For use by copy ctor and assignment operator. */
void matrix::copy(const matrix & other)
{
inherited::copy(other);
}
//////////
-// other constructors
+// other ctors
//////////
// public
matrix::matrix(unsigned r, unsigned c)
: inherited(TINFO_matrix), row(r), col(c)
{
- debugmsg("matrix constructor from unsigned,unsigned",LOGLEVEL_CONSTRUCT);
+ debugmsg("matrix ctor from unsigned,unsigned",LOGLEVEL_CONSTRUCT);
m.resize(r*c, _ex0());
}
matrix::matrix(unsigned r, unsigned c, const exvector & m2)
: inherited(TINFO_matrix), row(r), col(c), m(m2)
{
- debugmsg("matrix constructor from unsigned,unsigned,exvector",LOGLEVEL_CONSTRUCT);
+ debugmsg("matrix ctor from unsigned,unsigned,exvector",LOGLEVEL_CONSTRUCT);
}
//////////
/** Construct object from archive_node. */
matrix::matrix(const archive_node &n, const lst &sym_lst) : inherited(n, sym_lst)
{
- debugmsg("matrix constructor from archive_node", LOGLEVEL_CONSTRUCT);
+ debugmsg("matrix ctor from archive_node", LOGLEVEL_CONSTRUCT);
if (!(n.find_unsigned("row", row)) || !(n.find_unsigned("col", col)))
throw (std::runtime_error("unknown matrix dimensions in archive"));
m.reserve(row * col);
// public
-basic * matrix::duplicate() const
-{
- debugmsg("matrix duplicate",LOGLEVEL_DUPLICATE);
- return new matrix(*this);
-}
-
void matrix::print(std::ostream & os, unsigned upper_precedence) const
{
debugmsg("matrix print",LOGLEVEL_PRINT);
void matrix::printraw(std::ostream & os) const
{
debugmsg("matrix printraw",LOGLEVEL_PRINT);
- os << "matrix(" << row << "," << col <<",";
+ os << class_name() << "(" << row << "," << col <<",";
for (unsigned r=0; r<row-1; ++r) {
os << "(";
for (unsigned c=0; c<col-1; ++c)
return false;
}
-/** evaluate matrix entry by entry. */
+/** Evaluate matrix entry by entry. */
ex matrix::eval(int level) const
{
debugmsg("matrix eval",LOGLEVEL_MEMBER_FUNCTION);
status_flags::evaluated );
}
-/** evaluate matrix numerically entry by entry. */
+/** Evaluate matrix numerically entry by entry. */
ex matrix::evalf(int level) const
{
debugmsg("matrix evalf",LOGLEVEL_MEMBER_FUNCTION);
return matrix(row, col, m2);
}
+ex matrix::subs(const lst & ls, const lst & lr) const
+{
+ exvector m2(row * col);
+ for (unsigned r=0; r<row; ++r)
+ for (unsigned c=0; c<col; ++c)
+ m2[r*col+c] = m[r*col+c].subs(ls, lr);
+
+ return matrix(row, col, m2);
+}
+
// protected
int matrix::compare_same_type(const basic & other) const
return 0;
}
+/** Automatic symbolic evaluation of an indexed matrix. */
+ex matrix::eval_indexed(const basic & i) const
+{
+ GINAC_ASSERT(is_of_type(i, indexed));
+ GINAC_ASSERT(is_ex_of_type(i.op(0), matrix));
+
+ bool all_indices_unsigned = static_cast<const indexed &>(i).all_index_values_are(info_flags::nonnegint);
+
+ // Check indices
+ if (i.nops() == 2) {
+
+ // One index, must be one-dimensional vector
+ if (row != 1 && col != 1)
+ throw (std::runtime_error("matrix::eval_indexed(): vector must have exactly 1 index"));
+
+ const idx & i1 = ex_to_idx(i.op(1));
+
+ if (col == 1) {
+
+ // Column vector
+ if (!i1.get_dim().is_equal(row))
+ throw (std::runtime_error("matrix::eval_indexed(): dimension of index must match number of vector elements"));
+
+ // Index numeric -> return vector element
+ if (all_indices_unsigned) {
+ unsigned n1 = ex_to_numeric(i1.get_value()).to_int();
+ if (n1 >= row)
+ throw (std::runtime_error("matrix::eval_indexed(): value of index exceeds number of vector elements"));
+ return (*this)(n1, 0);
+ }
+
+ } else {
+
+ // Row vector
+ if (!i1.get_dim().is_equal(col))
+ throw (std::runtime_error("matrix::eval_indexed(): dimension of index must match number of vector elements"));
+
+ // Index numeric -> return vector element
+ if (all_indices_unsigned) {
+ unsigned n1 = ex_to_numeric(i1.get_value()).to_int();
+ if (n1 >= col)
+ throw (std::runtime_error("matrix::eval_indexed(): value of index exceeds number of vector elements"));
+ return (*this)(0, n1);
+ }
+ }
+
+ } else if (i.nops() == 3) {
+
+ // Two indices
+ const idx & i1 = ex_to_idx(i.op(1));
+ const idx & i2 = ex_to_idx(i.op(2));
+
+ if (!i1.get_dim().is_equal(row))
+ throw (std::runtime_error("matrix::eval_indexed(): dimension of first index must match number of rows"));
+ if (!i2.get_dim().is_equal(col))
+ throw (std::runtime_error("matrix::eval_indexed(): dimension of second index must match number of columns"));
+
+ // Pair of dummy indices -> compute trace
+ if (is_dummy_pair(i1, i2))
+ return trace();
+
+ // Both indices numeric -> return matrix element
+ if (all_indices_unsigned) {
+ unsigned n1 = ex_to_numeric(i1.get_value()).to_int(), n2 = ex_to_numeric(i2.get_value()).to_int();
+ if (n1 >= row)
+ throw (std::runtime_error("matrix::eval_indexed(): value of first index exceeds number of rows"));
+ if (n2 >= col)
+ throw (std::runtime_error("matrix::eval_indexed(): value of second index exceeds number of columns"));
+ return (*this)(n1, n2);
+ }
+
+ } else
+ throw (std::runtime_error("matrix::eval_indexed(): matrix must have exactly 2 indices"));
+
+ return i.hold();
+}
+
+/** Contraction of an indexed matrix with something else. */
+bool matrix::contract_with(exvector::iterator self, exvector::iterator other, exvector & v) const
+{
+ GINAC_ASSERT(is_ex_of_type(*self, indexed));
+ GINAC_ASSERT(is_ex_of_type(*other, indexed));
+ GINAC_ASSERT(self->nops() == 2 || self->nops() == 3);
+ GINAC_ASSERT(is_ex_of_type(self->op(0), matrix));
+
+ // Only contract with other matrices
+ if (!is_ex_of_type(other->op(0), matrix))
+ return false;
+
+ GINAC_ASSERT(other->nops() == 2 || other->nops() == 3);
+
+ const matrix &self_matrix = ex_to_matrix(self->op(0));
+ const matrix &other_matrix = ex_to_matrix(other->op(0));
+
+ if (self->nops() == 2) {
+ unsigned self_dim = (self_matrix.col == 1) ? self_matrix.row : self_matrix.col;
+
+ if (other->nops() == 2) { // vector * vector (scalar product)
+ unsigned other_dim = (other_matrix.col == 1) ? other_matrix.row : other_matrix.col;
+
+ if (self_matrix.col == 1) {
+ if (other_matrix.col == 1) {
+ // Column vector * column vector, transpose first vector
+ *self = self_matrix.transpose().mul(other_matrix)(0, 0);
+ } else {
+ // Column vector * row vector, swap factors
+ *self = other_matrix.mul(self_matrix)(0, 0);
+ }
+ } else {
+ if (other_matrix.col == 1) {
+ // Row vector * column vector, perfect
+ *self = self_matrix.mul(other_matrix)(0, 0);
+ } else {
+ // Row vector * row vector, transpose second vector
+ *self = self_matrix.mul(other_matrix.transpose())(0, 0);
+ }
+ }
+ *other = _ex1();
+ return true;
+
+ } else { // vector * matrix
+
+ // B_i * A_ij = (B*A)_j (B is row vector)
+ if (is_dummy_pair(self->op(1), other->op(1))) {
+ if (self_matrix.row == 1)
+ *self = indexed(self_matrix.mul(other_matrix), other->op(2));
+ else
+ *self = indexed(self_matrix.transpose().mul(other_matrix), other->op(2));
+ *other = _ex1();
+ return true;
+ }
+
+ // B_j * A_ij = (A*B)_i (B is column vector)
+ if (is_dummy_pair(self->op(1), other->op(2))) {
+ if (self_matrix.col == 1)
+ *self = indexed(other_matrix.mul(self_matrix), other->op(1));
+ else
+ *self = indexed(other_matrix.mul(self_matrix.transpose()), other->op(1));
+ *other = _ex1();
+ return true;
+ }
+ }
+
+ } else if (other->nops() == 3) { // matrix * matrix
+
+ // A_ij * B_jk = (A*B)_ik
+ if (is_dummy_pair(self->op(2), other->op(1))) {
+ *self = indexed(self_matrix.mul(other_matrix), self->op(1), other->op(2));
+ *other = _ex1();
+ return true;
+ }
+
+ // A_ij * B_kj = (A*Btrans)_ik
+ if (is_dummy_pair(self->op(2), other->op(2))) {
+ *self = indexed(self_matrix.mul(other_matrix.transpose()), self->op(1), other->op(1));
+ *other = _ex1();
+ return true;
+ }
+
+ // A_ji * B_jk = (Atrans*B)_ik
+ if (is_dummy_pair(self->op(1), other->op(1))) {
+ *self = indexed(self_matrix.transpose().mul(other_matrix), self->op(2), other->op(2));
+ *other = _ex1();
+ return true;
+ }
+
+ // A_ji * B_kj = (B*A)_ki
+ if (is_dummy_pair(self->op(1), other->op(2))) {
+ *self = indexed(other_matrix.mul(self_matrix), other->op(1), self->op(2));
+ *other = _ex1();
+ return true;
+ }
+ }
+
+ return false;
+}
+
+
//////////
// non-virtual functions in this class
//////////
throw (std::logic_error("matrix::inverse(): matrix not square"));
// NOTE: the Gauss-Jordan elimination used here can in principle be
- // replaced this by two clever calls to gauss_elimination() and some to
+ // replaced by two clever calls to gauss_elimination() and some to
// transpose(). Wouldn't be more efficient (maybe less?), just more
// orthogonal.
matrix tmp(row,col);
}
for (unsigned r2=0; r2<row; ++r2) {
if (r2 != r1) {
- ex a2 = cpy.m[r2*col+r1];
- for (unsigned c=0; c<col; ++c) {
- cpy.m[r2*col+c] -= a2 * cpy.m[r1*col+c];
- if (!cpy.m[r2*col+c].info(info_flags::numeric))
- cpy.m[r2*col+c] = cpy.m[r2*col+c].normal();
- tmp.m[r2*col+c] -= a2 * tmp.m[r1*col+c];
- if (!tmp.m[r2*col+c].info(info_flags::numeric))
- tmp.m[r2*col+c] = tmp.m[r2*col+c].normal();
+ if (!cpy.m[r2*col+r1].is_zero()) {
+ ex a2 = cpy.m[r2*col+r1];
+ // yes, there is something to do in this column
+ for (unsigned c=0; c<col; ++c) {
+ cpy.m[r2*col+c] -= a2 * cpy.m[r1*col+c];
+ if (!cpy.m[r2*col+c].info(info_flags::numeric))
+ cpy.m[r2*col+c] = cpy.m[r2*col+c].normal();
+ tmp.m[r2*col+c] -= a2 * tmp.m[r1*col+c];
+ if (!tmp.m[r2*col+c].info(info_flags::numeric))
+ tmp.m[r2*col+c] = tmp.m[r2*col+c].normal();
+ }
}
}
}
if (indx > 0)
sign = -sign;
for (unsigned r2=r0+1; r2<m; ++r2) {
- ex piv = this->m[r2*n+r1] / this->m[r0*n+r1];
- for (unsigned c=r1+1; c<n; ++c) {
- this->m[r2*n+c] -= piv * this->m[r0*n+c];
- if (!this->m[r2*n+c].info(info_flags::numeric))
- this->m[r2*n+c] = this->m[r2*n+c].normal();
+ if (!this->m[r2*n+r1].is_zero()) {
+ // yes, there is something to do in this row
+ ex piv = this->m[r2*n+r1] / this->m[r0*n+r1];
+ for (unsigned c=r1+1; c<n; ++c) {
+ this->m[r2*n+c] -= piv * this->m[r0*n+c];
+ if (!this->m[r2*n+c].info(info_flags::numeric))
+ this->m[r2*n+c] = this->m[r2*n+c].normal();
+ }
}
// fill up left hand side with zeros
for (unsigned c=0; c<=r1; ++c)
// matrix needs pivoting, so swap rows k and ro
ensure_if_modifiable();
for (unsigned c=0; c<col; ++c)
- m[k*col+c].swap(m[ro*col+c]);
+ this->m[k*col+c].swap(this->m[ro*col+c]);
return k;
}
return m;
}
-//////////
-// global constants
-//////////
-
-const matrix some_matrix;
-const std::type_info & typeid_matrix = typeid(some_matrix);
-
-#ifndef NO_NAMESPACE_GINAC
} // namespace GiNaC
-#endif // ndef NO_NAMESPACE_GINAC
git://www.ginac.de / ginac.git / blobdiff