X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=ginac%2Ftensor.cpp;h=259af3e45d3a579639f1712e7b5100bf9123d9e7;hp=399d3119ba742ba0b8d8cc21c8ef906ae5835664;hb=9d92d4b442fc4c1a95685884be4ba0494cd02bbe;hpb=6d225ee55693c0617d254e6fa283c00c71bd2919 diff --git a/ginac/tensor.cpp b/ginac/tensor.cpp index 399d3119..259af3e4 100644 --- a/ginac/tensor.cpp +++ b/ginac/tensor.cpp @@ -3,7 +3,7 @@ * Implementation of GiNaC's special tensors. */ /* - * GiNaC Copyright (C) 1999-2004 Johannes Gutenberg University Mainz, Germany + * GiNaC Copyright (C) 1999-2008 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 @@ -17,7 +17,7 @@ * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include @@ -64,7 +64,7 @@ GINAC_IMPLEMENT_REGISTERED_CLASS_OPT(tensepsilon, tensor, // constructors ////////// -tensor::tensor() : inherited(TINFO_tensor) +tensor::tensor() { setflag(status_flags::evaluated | status_flags::expanded); } @@ -74,44 +74,34 @@ DEFAULT_CTOR(tensmetric) minkmetric::minkmetric() : pos_sig(false) { - tinfo_key = TINFO_minkmetric; } spinmetric::spinmetric() { - tinfo_key = TINFO_spinmetric; } minkmetric::minkmetric(bool ps) : pos_sig(ps) { - tinfo_key = TINFO_minkmetric; } tensepsilon::tensepsilon() : minkowski(false), pos_sig(false) { - tinfo_key = TINFO_tensepsilon; } tensepsilon::tensepsilon(bool mink, bool ps) : minkowski(mink), pos_sig(ps) { - tinfo_key = TINFO_tensepsilon; } ////////// // archiving ////////// -DEFAULT_ARCHIVING(tensor) -DEFAULT_ARCHIVING(tensdelta) -DEFAULT_ARCHIVING(tensmetric) -DEFAULT_ARCHIVING(spinmetric) -DEFAULT_UNARCHIVE(minkmetric) -DEFAULT_UNARCHIVE(tensepsilon) - -minkmetric::minkmetric(const archive_node &n, lst &sym_lst) : inherited(n, sym_lst) +void minkmetric::read_archive(const archive_node& n, lst& sym_lst) { + inherited::read_archive(n, sym_lst); n.find_bool("pos_sig", pos_sig); } +GINAC_BIND_UNARCHIVER(minkmetric); void minkmetric::archive(archive_node &n) const { @@ -119,11 +109,13 @@ void minkmetric::archive(archive_node &n) const n.add_bool("pos_sig", pos_sig); } -tensepsilon::tensepsilon(const archive_node &n, lst &sym_lst) : inherited(n, sym_lst) +void tensepsilon::read_archive(const archive_node& n, lst& sym_lst) { + inherited::read_archive(n, sym_lst); n.find_bool("minkowski", minkowski); n.find_bool("pos_sig", pos_sig); } +GINAC_BIND_UNARCHIVER(tensepsilon); void tensepsilon::archive(archive_node &n) const { @@ -132,6 +124,10 @@ void tensepsilon::archive(archive_node &n) const n.add_bool("pos_sig", pos_sig); } +GINAC_BIND_UNARCHIVER(tensdelta); +GINAC_BIND_UNARCHIVER(tensmetric); +GINAC_BIND_UNARCHIVER(spinmetric); + ////////// // functions overriding virtual functions from base classes ////////// @@ -141,6 +137,22 @@ DEFAULT_COMPARE(tensdelta) DEFAULT_COMPARE(tensmetric) DEFAULT_COMPARE(spinmetric) +bool tensdelta::info(unsigned inf) const +{ + if(inf == info_flags::real) + return true; + + return false; +} + +bool tensmetric::info(unsigned inf) const +{ + if(inf == info_flags::real) + return true; + + return false; +} + int minkmetric::compare_same_type(const basic & other) const { GINAC_ASSERT(is_a(other)); @@ -152,6 +164,14 @@ int minkmetric::compare_same_type(const basic & other) const return inherited::compare_same_type(other); } +bool minkmetric::info(unsigned inf) const +{ + if(inf == info_flags::real) + return true; + + return false; +} + int tensepsilon::compare_same_type(const basic & other) const { GINAC_ASSERT(is_a(other)); @@ -165,6 +185,22 @@ int tensepsilon::compare_same_type(const basic & other) const return inherited::compare_same_type(other); } +bool tensepsilon::info(unsigned inf) const +{ + if(inf == info_flags::real) + return true; + + return false; +} + +bool spinmetric::info(unsigned inf) const +{ + if(inf == info_flags::real) + return true; + + return false; +} + DEFAULT_PRINT_LATEX(tensdelta, "delta", "\\delta") DEFAULT_PRINT(tensmetric, "g") DEFAULT_PRINT_LATEX(minkmetric, "eta", "\\eta") @@ -355,6 +391,8 @@ bool tensor::replace_contr_index(exvector::iterator self, exvector::iterator oth again: if (self_idx->is_symbolic()) { for (size_t i=1; inops(); i++) { + if (! is_a(other->op(i))) + continue; const idx &other_idx = ex_to(other->op(i)); if (is_dummy_pair(*self_idx, other_idx)) { @@ -534,40 +572,51 @@ bool tensepsilon::contract_with(exvector::iterator self, exvector::iterator othe ex delta_tensor(const ex & i1, const ex & i2) { + static ex delta = (new tensdelta)->setflag(status_flags::dynallocated); + if (!is_a(i1) || !is_a(i2)) throw(std::invalid_argument("indices of delta tensor must be of type idx")); - return indexed(tensdelta(), sy_symm(), i1, i2); + return indexed(delta, symmetric2(), i1, i2); } ex metric_tensor(const ex & i1, const ex & i2) { + static ex metric = (new tensmetric)->setflag(status_flags::dynallocated); + if (!is_a(i1) || !is_a(i2)) throw(std::invalid_argument("indices of metric tensor must be of type varidx")); - return indexed(tensmetric(), sy_symm(), i1, i2); + return indexed(metric, symmetric2(), i1, i2); } ex lorentz_g(const ex & i1, const ex & i2, bool pos_sig) { + static ex metric_neg = (new minkmetric(false))->setflag(status_flags::dynallocated); + static ex metric_pos = (new minkmetric(true))->setflag(status_flags::dynallocated); + if (!is_a(i1) || !is_a(i2)) throw(std::invalid_argument("indices of metric tensor must be of type varidx")); - return indexed(minkmetric(pos_sig), sy_symm(), i1, i2); + return indexed(pos_sig ? metric_pos : metric_neg, symmetric2(), i1, i2); } ex spinor_metric(const ex & i1, const ex & i2) { + static ex metric = (new spinmetric)->setflag(status_flags::dynallocated); + if (!is_a(i1) || !is_a(i2)) throw(std::invalid_argument("indices of spinor metric must be of type spinidx")); if (!ex_to(i1).get_dim().is_equal(2) || !ex_to(i2).get_dim().is_equal(2)) throw(std::runtime_error("index dimension for spinor metric must be 2")); - return indexed(spinmetric(), sy_anti(), i1, i2); + return indexed(metric, antisymmetric2(), i1, i2); } ex epsilon_tensor(const ex & i1, const ex & i2) { + static ex epsilon = (new tensepsilon)->setflag(status_flags::dynallocated); + if (!is_a(i1) || !is_a(i2)) throw(std::invalid_argument("indices of epsilon tensor must be of type idx")); @@ -577,11 +626,16 @@ ex epsilon_tensor(const ex & i1, const ex & i2) if (!ex_to(i1).get_dim().is_equal(_ex2)) throw(std::runtime_error("index dimension of epsilon tensor must match number of indices")); - return indexed(tensepsilon(), sy_anti(), i1, i2); + if(is_a(i1.op(0))||is_a(i2.op(0))) + return indexed(epsilon, antisymmetric2(), i1, i2).hold(); + + return indexed(epsilon, antisymmetric2(), i1, i2); } ex epsilon_tensor(const ex & i1, const ex & i2, const ex & i3) { + static ex epsilon = (new tensepsilon)->setflag(status_flags::dynallocated); + if (!is_a(i1) || !is_a(i2) || !is_a(i3)) throw(std::invalid_argument("indices of epsilon tensor must be of type idx")); @@ -591,11 +645,17 @@ ex epsilon_tensor(const ex & i1, const ex & i2, const ex & i3) if (!ex_to(i1).get_dim().is_equal(_ex3)) throw(std::runtime_error("index dimension of epsilon tensor must match number of indices")); - return indexed(tensepsilon(), sy_anti(), i1, i2, i3); + if(is_a(i1.op(0))||is_a(i2.op(0))||is_a(i3.op(0))) + return indexed(epsilon, antisymmetric3(), i1, i2, i3).hold(); + + return indexed(epsilon, antisymmetric3(), i1, i2, i3); } ex lorentz_eps(const ex & i1, const ex & i2, const ex & i3, const ex & i4, bool pos_sig) { + static ex epsilon_neg = (new tensepsilon(true, false))->setflag(status_flags::dynallocated); + static ex epsilon_pos = (new tensepsilon(true, true))->setflag(status_flags::dynallocated); + if (!is_a(i1) || !is_a(i2) || !is_a(i3) || !is_a(i4)) throw(std::invalid_argument("indices of Lorentz epsilon tensor must be of type varidx")); @@ -605,7 +665,10 @@ ex lorentz_eps(const ex & i1, const ex & i2, const ex & i3, const ex & i4, bool if (!ex_to(i1).get_dim().is_equal(_ex4)) throw(std::runtime_error("index dimension of epsilon tensor must match number of indices")); - return indexed(tensepsilon(true, pos_sig), sy_anti(), i1, i2, i3, i4); + if(is_a(i1.op(0))||is_a(i2.op(0))||is_a(i3.op(0))||is_a(i4.op(0))) + return indexed(pos_sig ? epsilon_pos : epsilon_neg, antisymmetric4(), i1, i2, i3, i4).hold(); + + return indexed(pos_sig ? epsilon_pos : epsilon_neg, antisymmetric4(), i1, i2, i3, i4); } } // namespace GiNaC