2018-09-23 18:02:59 +0200 received badge ● Student (source) 2018-09-23 16:49:21 +0200 asked a question Enumerating points in 0-dimensional ideals over Qbar I would like to find the points of a 0-dimensional ideal over Qbar. That is I do not want just the rational points, The problem is that I found multiple problem while doing that. 1) While the code R. = PolynomialRing(QQbar,6, order="degrevlex(3),lex(3)")  is legal, the code R. = PolynomialRing(QQbar,6, order="degrevlex(3)")  is not for reasons that esapes me. 2) The code R. = PolynomialRing(QQbar,6, order="degrevlex(3),lex(3)") tvars = [t1,t2,t3] eltsyms = [R((SymmetricFunctions(QQbar).elementary())[i].expand(3,alphabet=tvars)) for i in range(4)]  is not legal, it is if we replace QQbar by QQ. Why? 2018-09-23 16:49:21 +0200 asked a question Finding points of 0-dimensional variety over Qbar I would like to find the points of a 0-dimensional ideal over Qbar. That is I do not want just the rational points, but also the algebraic points. The problem is that I found multiple problem while doing that. 1) While the code R. = PolynomialRing(QQbar,6, order="degrevlex(3),lex(3)") is legal, the code R. = PolynomialRing(QQ,3, order="degrevlex(3)") is not. While the code R. = PolynomialRing(QQ,6, order="degrevlex(3),lex(3)") tvars = [t1,t2,t3] eltsyms = [R((SymmetricFunctions(QQ).elementary())[i].expand(3,alphabet=tvars)) for i in range(4)] is legal, it is not if we replace QQ by QQbar? 2015-09-01 00:55:44 +0200 received badge ● Famous Question (source) 2014-04-02 09:50:16 +0200 received badge ● Notable Question (source) 2013-06-28 21:45:29 +0200 received badge ● Popular Question (source) 2012-11-16 15:51:10 +0200 answered a question python install and fortran Both strategies (sage -sh and the F2CLIBS definition) failed. The problem is in the call to "setup" in "setup.py", where is this function defined? 2012-11-07 04:18:23 +0200 asked a question python install and fortran I want to install the package PyNIO with sage 5.3 The problem occurs with the fortran compiler. When doing sage --python setup.py install I get following errors customize UnixCCompiler customize UnixCCompiler using build_clib customize GnuFCompiler Found executable /srv/gluster/home/mathieu/opt/sage-5.3-linux-64bit-ubuntu_10.04.4_lts-x86_64-Linux/local/bin/gfortran gnu: no Fortran 90 compiler found Found executable /usr/bin/ld Found executable /usr/bin/ar Found executable /usr/bin/ranlib gnu: no Fortran 90 compiler found customize IntelFCompiler Found executable /opt/intel/composer_xe_2011_sp1/bin/ifort customize LaheyFCompiler Could not locate executable lf95 customize PGroupFCompiler Could not locate executable pgf90 customize AbsoftFCompiler customize NAGFCompiler customize VastFCompiler customize CompaqFCompiler customize IntelItaniumFCompiler customize IntelEM64TFCompiler customize Gnu95FCompiler customize G95FCompiler don't know how to compile Fortran code on platform 'posix' building 'nio' library error: library nio has Fortran sources but no Fortran compiler found On the other hand when I try to install on a Python 2.7.3 installed in my home directory using python setup.py install there is apparently no error at all: customize UnixCCompiler customize UnixCCompiler using build_clib customize GnuFCompiler Found executable /opt/intel/composer_xe_2011_sp1/bin/ifort gnu: no Fortran 90 compiler found Could not locate executable g77 Could not locate executable f77 gnu: no Fortran 90 compiler found customize IntelFCompiler customize LaheyFCompiler Could not locate executable lf95 customize PGroupFCompiler Could not locate executable pgfortran customize AbsoftFCompiler customize NAGFCompiler customize VastFCompiler customize CompaqFCompiler customize IntelItaniumFCompiler customize IntelEM64TFCompiler customize IntelEM64TFCompiler customize IntelEM64TFCompiler using build_clib building 'nio' library compiling C sources What could explain this difference in behavior between using sage alone and using Python 2.7.3? Best, Mathieu