January 2014 - GiNaC-list

Example Input Program Hanging Up
by Casey Conger 03 Feb '14

03 Feb '14

Hello all, I’m having trouble with running the example interactive program from the tutorial. I simply cut and pasted it, but after it asks for “an expression involving ‘x’ “ it just hangs and never does anything. The problem seems to be in the line ‘ex e = reader(cin)’, I got the other examples to run just fine, but the reader(cin) seems to be problematic. My setup: Macbook Air1.5GHZ i7, OSX 10.9.1, ginac 1.6.2 My program: #include <iostream> #include <string> #include <stdexcept> #include <ginac/ginac.h> using namespace std; using namespace GiNaC; int main() { cout << "Enter an expression containing ’x’: " << flush; parser reader; try { ex e = reader(cin); symtab table = reader.get_syms(); symbol x = table.find("x") != table.end() ? ex_to<symbol>(table["x"]) : symbol("x"); cout << "The derivative of " << e << " with respect to x is "; cout << e.diff(x) << "." << endl; } catch (exception &p) { cerr << p.what() << endl; } } Commandline: Caseys-MacBook-Air:ginac casey$ g++ ginacPlay.cpp -o ginacPlay.out -lginac -lcln Caseys-MacBook-Air:ginac casey$ ./ginacPlay.out Enter an expression containing ’x’: x ^C …It just hangs there for several minutes.

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Stay in touch with me through LinkedIn
by Jose Antonio Garcia Peiro 29 Jan '14

29 Jan '14

LinkedIn ------------ Me gustaría añadirte a mi red profesional en LinkedIn. -Jose Antonio Jose Antonio Garcia Peiro Estudiante de Universidad Miguel Hernández de Elche Murcia y alrededores, España Confirm that you know Jose Antonio Garcia Peiro: https://www.linkedin.com/e/-qmwzwc-hr0w8crr-5d/isd/4281101300/r-1XX1c3/?hs=… -- You are receiving Invitation to Connect emails. Click to unsubscribe: http://www.linkedin.com/e/-qmwzwc-hr0w8crr-5d/kGy7Yg-6HHAoBPMg-Y4n5eWUQMwWs… (c) 2012 LinkedIn Corporation. 2029 Stierlin Ct, Mountain View, CA 94043, USA.

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Problems running ginac on OSX 10.9
by Casey Conger 19 Jan '14

19 Jan '14

Hello, I apologize in advance because I am extremely bad with anything beyond simple computing. My Setup: OSX 10.9.1, gcc4.8 My Situation: After some trouble compiling, I finally was able make/ make install with no errors. Now when I try to run one of the example programs, it doesn’t compile. I see all of the header files located in /usr/local/include/ginac. I try to compile with g++ derivative.cpp -I /usr/local/include or g++ derivative.cpp -L /usr/local/include but I get the following: Caseys-MacBook-Air:examples casey$ g++ derivative.cpp -I/usr/local/include/ Undefined symbols for architecture x86_64: "GiNaC::library_init::library_init()", referenced from: ___cxx_global_var_init in derivative-sy6zT0.o "GiNaC::library_init::~library_init()", referenced from: ___cxx_global_var_init in derivative-sy6zT0.o "GiNaC::add_unarchiver::add_unarchiver()", referenced from: ___cxx_global_var_init18 in derivative-sy6zT0.o "GiNaC::add_unarchiver::~add_unarchiver()", referenced from: ___cxx_global_var_init18 in derivative-sy6zT0.o "GiNaC::idx_unarchiver::idx_unarchiver()", referenced from: ___cxx_global_var_init22 in derivative-sy6zT0.o "GiNaC::idx_unarchiver::~idx_unarchiver()", referenced from: ___cxx_global_var_init22 in derivative-sy6zT0.o "GiNaC::lst_unarchiver::lst_unarchiver()", referenced from: ___cxx_global_var_init2 in derivative-sy6zT0.o "GiNaC::lst_unarchiver::~lst_unarchiver()", referenced from: ___cxx_global_var_init2 in derivative-sy6zT0.o "GiNaC::mul_unarchiver::mul_unarchiver()", referenced from: ___cxx_global_var_init19 in derivative-sy6zT0.o "GiNaC::mul_unarchiver::~mul_unarchiver()", referenced from: ___cxx_global_var_init19 in derivative-sy6zT0.o "GiNaC::fail_unarchiver::fail_unarchiver()", referenced from: ___cxx_global_var_init4 in derivative-sy6zT0.o "GiNaC::fail_unarchiver::~fail_unarchiver()", referenced from: ___cxx_global_var_init4 in derivative-sy6zT0.o "GiNaC::su3d_unarchiver::su3d_unarchiver()", referenced from: ___cxx_global_var_init34 in derivative-sy6zT0.o "GiNaC::su3d_unarchiver::~su3d_unarchiver()", referenced from: ___cxx_global_var_init34 in derivative-sy6zT0.o "GiNaC::su3f_unarchiver::su3f_unarchiver()", referenced from: ___cxx_global_var_init33 in derivative-sy6zT0.o "GiNaC::su3f_unarchiver::~su3f_unarchiver()", referenced from: ___cxx_global_var_init33 in derivative-sy6zT0.o "GiNaC::su3t_unarchiver::su3t_unarchiver()", referenced from: ___cxx_global_var_init32 in derivative-sy6zT0.o "GiNaC::su3t_unarchiver::~su3t_unarchiver()", referenced from: ___cxx_global_var_init32 in derivative-sy6zT0.o "GiNaC::color_unarchiver::color_unarchiver()", referenced from: ___cxx_global_var_init30 in derivative-sy6zT0.o "GiNaC::color_unarchiver::~color_unarchiver()", referenced from: ___cxx_global_var_init30 in derivative-sy6zT0.o "GiNaC::ncmul_unarchiver::ncmul_unarchiver()", referenced from: ___cxx_global_var_init10 in derivative-sy6zT0.o "GiNaC::ncmul_unarchiver::~ncmul_unarchiver()", referenced from: ___cxx_global_var_init10 in derivative-sy6zT0.o "GiNaC::power_unarchiver::power_unarchiver()", referenced from: ___cxx_global_var_init8 in derivative-sy6zT0.o "GiNaC::power_unarchiver::~power_unarchiver()", referenced from: ___cxx_global_var_init8 in derivative-sy6zT0.o "GiNaC::matrix_unarchiver::matrix_unarchiver()", referenced from: ___cxx_global_var_init6 in derivative-sy6zT0.o "GiNaC::matrix_unarchiver::~matrix_unarchiver()", referenced from: ___cxx_global_var_init6 in derivative-sy6zT0.o "GiNaC::su3one_unarchiver::su3one_unarchiver()", referenced from: ___cxx_global_var_init31 in derivative-sy6zT0.o "GiNaC::su3one_unarchiver::~su3one_unarchiver()", referenced from: ___cxx_global_var_init31 in derivative-sy6zT0.o "GiNaC::symbol_unarchiver::symbol_unarchiver()", referenced from: ___cxx_global_var_init11 in derivative-sy6zT0.o "GiNaC::symbol_unarchiver::~symbol_unarchiver()", referenced from: ___cxx_global_var_init11 in derivative-sy6zT0.o "GiNaC::unarchive_table_t::unarchive_table_t()", referenced from: ___cxx_global_var_init1 in derivative-sy6zT0.o "GiNaC::unarchive_table_t::~unarchive_table_t()", referenced from: ___cxx_global_var_init1 in derivative-sy6zT0.o "GiNaC::varidx_unarchiver::varidx_unarchiver()", referenced from: ___cxx_global_var_init23 in derivative-sy6zT0.o "GiNaC::varidx_unarchiver::~varidx_unarchiver()", referenced from: ___cxx_global_var_init23 in derivative-sy6zT0.o "GiNaC::get_default_reader()", referenced from: _main in derivative-sy6zT0.o "GiNaC::indexed_unarchiver::indexed_unarchiver()", referenced from: ___cxx_global_var_init15 in derivative-sy6zT0.o "GiNaC::indexed_unarchiver::~indexed_unarchiver()", referenced from: ___cxx_global_var_init15 in derivative-sy6zT0.o "GiNaC::numeric_unarchiver::numeric_unarchiver()", referenced from: ___cxx_global_var_init7 in derivative-sy6zT0.o "GiNaC::numeric_unarchiver::~numeric_unarchiver()", referenced from: ___cxx_global_var_init7 in derivative-sy6zT0.o "GiNaC::pseries_unarchiver::pseries_unarchiver()", referenced from: ___cxx_global_var_init16 in derivative-sy6zT0.o "GiNaC::pseries_unarchiver::~pseries_unarchiver()", referenced from: ___cxx_global_var_init16 in derivative-sy6zT0.o "GiNaC::spinidx_unarchiver::spinidx_unarchiver()", referenced from: ___cxx_global_var_init24 in derivative-sy6zT0.o "GiNaC::spinidx_unarchiver::~spinidx_unarchiver()", referenced from: ___cxx_global_var_init24 in derivative-sy6zT0.o "GiNaC::clifford_unarchiver::clifford_unarchiver()", referenced from: ___cxx_global_var_init35 in derivative-sy6zT0.o "GiNaC::clifford_unarchiver::~clifford_unarchiver()", referenced from: ___cxx_global_var_init35 in derivative-sy6zT0.o "GiNaC::constant_unarchiver::constant_unarchiver()", referenced from: ___cxx_global_var_init3 in derivative-sy6zT0.o "GiNaC::constant_unarchiver::~constant_unarchiver()", referenced from: ___cxx_global_var_init3 in derivative-sy6zT0.o "GiNaC::diracone_unarchiver::diracone_unarchiver()", referenced from: ___cxx_global_var_init36 in derivative-sy6zT0.o "GiNaC::diracone_unarchiver::~diracone_unarchiver()", referenced from: ___cxx_global_var_init36 in derivative-sy6zT0.o "GiNaC::function_unarchiver::function_unarchiver()", referenced from: ___cxx_global_var_init20 in derivative-sy6zT0.o "GiNaC::function_unarchiver::~function_unarchiver()", referenced from: ___cxx_global_var_init20 in derivative-sy6zT0.o "GiNaC::integral_unarchiver::integral_unarchiver()", referenced from: ___cxx_global_var_init5 in derivative-sy6zT0.o "GiNaC::integral_unarchiver::~integral_unarchiver()", referenced from: ___cxx_global_var_init5 in derivative-sy6zT0.o "GiNaC::symmetry_unarchiver::symmetry_unarchiver()", referenced from: ___cxx_global_var_init17 in derivative-sy6zT0.o "GiNaC::symmetry_unarchiver::~symmetry_unarchiver()", referenced from: ___cxx_global_var_init17 in derivative-sy6zT0.o "GiNaC::wildcard_unarchiver::wildcard_unarchiver()", referenced from: ___cxx_global_var_init14 in derivative-sy6zT0.o "GiNaC::wildcard_unarchiver::~wildcard_unarchiver()", referenced from: ___cxx_global_var_init14 in derivative-sy6zT0.o "GiNaC::possymbol_unarchiver::possymbol_unarchiver()", referenced from: ___cxx_global_var_init13 in derivative-sy6zT0.o "GiNaC::possymbol_unarchiver::~possymbol_unarchiver()", referenced from: ___cxx_global_var_init13 in derivative-sy6zT0.o "GiNaC::tensdelta_unarchiver::tensdelta_unarchiver()", referenced from: ___cxx_global_var_init25 in derivative-sy6zT0.o "GiNaC::tensdelta_unarchiver::~tensdelta_unarchiver()", referenced from: ___cxx_global_var_init25 in derivative-sy6zT0.o "GiNaC::diracgamma_unarchiver::diracgamma_unarchiver()", referenced from: ___cxx_global_var_init37 in derivative-sy6zT0.o "GiNaC::diracgamma_unarchiver::~diracgamma_unarchiver()", referenced from: ___cxx_global_var_init37 in derivative-sy6zT0.o "GiNaC::minkmetric_unarchiver::minkmetric_unarchiver()", referenced from: ___cxx_global_var_init27 in derivative-sy6zT0.o "GiNaC::minkmetric_unarchiver::~minkmetric_unarchiver()", referenced from: ___cxx_global_var_init27 in derivative-sy6zT0.o "GiNaC::realsymbol_unarchiver::realsymbol_unarchiver()", referenced from: ___cxx_global_var_init12 in derivative-sy6zT0.o "GiNaC::realsymbol_unarchiver::~realsymbol_unarchiver()", referenced from: ___cxx_global_var_init12 in derivative-sy6zT0.o "GiNaC::relational_unarchiver::relational_unarchiver()", referenced from: ___cxx_global_var_init9 in derivative-sy6zT0.o "GiNaC::relational_unarchiver::~relational_unarchiver()", referenced from: ___cxx_global_var_init9 in derivative-sy6zT0.o "GiNaC::spinmetric_unarchiver::spinmetric_unarchiver()", referenced from: ___cxx_global_var_init28 in derivative-sy6zT0.o "GiNaC::spinmetric_unarchiver::~spinmetric_unarchiver()", referenced from: ___cxx_global_var_init28 in derivative-sy6zT0.o "GiNaC::tensmetric_unarchiver::tensmetric_unarchiver()", referenced from: ___cxx_global_var_init26 in derivative-sy6zT0.o "GiNaC::tensmetric_unarchiver::~tensmetric_unarchiver()", referenced from: ___cxx_global_var_init26 in derivative-sy6zT0.o "GiNaC::diracgamma5_unarchiver::diracgamma5_unarchiver()", referenced from: ___cxx_global_var_init38 in derivative-sy6zT0.o "GiNaC::diracgamma5_unarchiver::~diracgamma5_unarchiver()", referenced from: ___cxx_global_var_init38 in derivative-sy6zT0.o "GiNaC::diracgammaL_unarchiver::diracgammaL_unarchiver()", referenced from: ___cxx_global_var_init39 in derivative-sy6zT0.o "GiNaC::diracgammaL_unarchiver::~diracgammaL_unarchiver()", referenced from: ___cxx_global_var_init39 in derivative-sy6zT0.o "GiNaC::diracgammaR_unarchiver::diracgammaR_unarchiver()", referenced from: ___cxx_global_var_init40 in derivative-sy6zT0.o "GiNaC::diracgammaR_unarchiver::~diracgammaR_unarchiver()", referenced from: ___cxx_global_var_init40 in derivative-sy6zT0.o "GiNaC::fderivative_unarchiver::fderivative_unarchiver()", referenced from: ___cxx_global_var_init21 in derivative-sy6zT0.o "GiNaC::fderivative_unarchiver::~fderivative_unarchiver()", referenced from: ___cxx_global_var_init21 in derivative-sy6zT0.o "GiNaC::tensepsilon_unarchiver::tensepsilon_unarchiver()", referenced from: ___cxx_global_var_init29 in derivative-sy6zT0.o "GiNaC::tensepsilon_unarchiver::~tensepsilon_unarchiver()", referenced from: ___cxx_global_var_init29 in derivative-sy6zT0.o "GiNaC::basic::basic(GiNaC::basic const&)", referenced from: GiNaC::symbol::symbol(GiNaC::symbol const&) in derivative-sy6zT0.o "GiNaC::parser::parser(std::__1::map<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, GiNaC::ex, std::__1::less<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > >, std::__1::allocator<std::__1::pair<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const, GiNaC::ex> > > const&, bool, std::__1::map<std::__1::pair<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, unsigned long>, GiNaC::ex (*)(std::__1::vector<GiNaC::ex, std::__1::allocator<GiNaC::ex> > const&), GiNaC::PrototypeLess, std::__1::allocator<std::__1::pair<std::__1::pair<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, unsigned long> const, GiNaC::ex (*)(std::__1::vector<GiNaC::ex, std::__1::allocator<GiNaC::ex> > const&)> > > const&)", referenced from: _main in derivative-sy6zT0.o "GiNaC::parser::~parser()", referenced from: _main in derivative-sy6zT0.o "GiNaC::parser::operator()(std::__1::basic_istream<char, std::__1::char_traits<char> >&)", referenced from: _main in derivative-sy6zT0.o "GiNaC::symbol::symbol(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&)", referenced from: _main in derivative-sy6zT0.o "GiNaC::_num0_bp", referenced from: GiNaC::ex::ex() in derivative-sy6zT0.o "GiNaC::operator<<(std::__1::basic_ostream<char, std::__1::char_traits<char> >&, GiNaC::ex const&)", referenced from: _main in derivative-sy6zT0.o "GiNaC::ex::diff(GiNaC::symbol const&, unsigned int) const", referenced from: _main in derivative-sy6zT0.o "vtable for GiNaC::basic", referenced from: GiNaC::basic::~basic() in derivative-sy6zT0.o NOTE: a missing vtable usually means the first non-inline virtual member function has no definition. "vtable for GiNaC::symbol", referenced from: GiNaC::symbol::~symbol() in derivative-sy6zT0.o GiNaC::symbol::symbol(GiNaC::symbol const&) in derivative-sy6zT0.o NOTE: a missing vtable usually means the first non-inline virtual member function has no definition. ld: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation) It seems like it just can’t find these functions, but I have no idea why. Thank you in advance for your help. -Casey

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Randomness when using lsolve
by Federico Bergero 16 Jan '14

16 Jan '14

Hello everybody I'm new to GiNaC. I'm trying to use it to solve linear algebraic system of equations and running the example from the tutorial https://www.ginac.de/tutorial/Solving-linear-systems-of-equations.html#Solv… symbol a("a"), b("b"), x("x"), y("y"); lst eqns, vars; eqns = a*x+b*y==3, x-y==b; vars = x, y; cout << lsolve(eqns, vars) << endl; While it works perfectly when I run it several times I get different solutions (they are all equivalent though). For example: {x==(3+b^2)*(a+b)^(-1),y==-(a+b)^(-1)*(-3+a*b)} or {x==(b+a)^(-1)*(3+b^2),y==-(-3+b*a)*(b+a)^(-1)} what is going on there? Is there a way to have a deterministic solution? Thanks in advance. Fede -- I find television very educational. Every time someone switches it on, I go into another room and read a good book.

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