November 2006 - GiNaC-list

Problem with scalar_products : Scalar product of two vectors in index notation
by aravind b 09 Nov '06

09 Nov '06

Hi, Hope everyone's doing fine ! Please go through this code : #include <iostream> #include <ginac/ginac.h> using namespace std; using namespace GiNaC; int main() { symbol i_sym("i"), j_sym("j"), e("e"), a("a"), b("b") ; idx i(i_sym, 3), j( j_sym, 3) ; //defining indices i and j scalar_products sp; sp.add( indexed(e, i), indexed(e, j), delta_tensor(i,j) ); // e.i* e.j = delta_tensor.i.j cout << (indexed(e,i)*indexed(e,j)).simplify_indexed(sp) <<endl ; return 0; } does NOT give delta.j.i instead just gives e.i * e.j - why? Basically, i want to define an orthonormal basis vector set {e.i}. If i have vector_a = indexed(a, i) * indexed(e, i) and vector_b = indexed(b, j) * indexed(e, j) , then i want adotb to reduce to a.i * b.i ( ofcoure after i apply simplify_indexed(sp) to adotb ) Thanks a lot for going through this mail.

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Problem with linking ginac
by aravind b 08 Nov '06

08 Nov '06

Hello, I am using quantian *0.7.9.2 *live dvd and i am a total newbie to linux. I am really unable to use ginac. Firstly, locate ginac-config doesnt give any results. whereas locate ginac gives: *locate: warning: database `/var/cache/locate/locatedb' is more than 8 days old /usr/lib/libginac-1.3.so.2 /usr/lib/libginac-1.3.so.2.1.0 /usr/share/doc/ginac-tools /usr/share/doc/ginac-tools/AUTHORS /usr/share/doc/ginac-tools/changelog.Debian.gz /usr/share/doc/ginac-tools/changelog.gz /usr/share/doc/ginac-tools/copyright /usr/share/doc/ginac-tools/NEWS.gz /usr/share/doc/ginac-tools/README /usr/share/doc/libginac1.3c2a /usr/share/doc/libginac1.3c2a/AUTHORS /usr/share/doc/libginac1.3c2a/changelog.Debian.gz /usr/share/doc/libginac1.3c2a/changelog.gz /usr/share/doc/libginac1.3c2a/copyright /usr/share/doc/libginac1.3c2a/NEWS.gz /usr/share/doc/libginac1.3c2a/README /usr/share/menu/ginac-tools /usr/share/pixmaps/ginac.xpm /var/lib/dpkg/info/ginac-tools.list /var/lib/dpkg/info/ginac-tools.md5sums /var/lib/dpkg/info/ginac-tools.postinst /var/lib/dpkg/info/ginac-tools.postrm /var/lib/dpkg/info/libginac1.3c2.list /var/lib/dpkg/info/libginac1.3c2.postrm /var/lib/dpkg/info/libginac1.3c2a.list /var/lib/dpkg/info/libginac1.3c2a.md5sums /var/lib/dpkg/info/libginac1.3c2a.postinst /var/lib/dpkg/info/libginac1.3c2a.postrm /var/lib/dpkg/info/libginac1.3c2a.shlibs *Guys, please help me out here. How do i link ginac to my C++ code using g++? Thanks a lot for going through this mail with regards, aravind * *

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Problem with linking ginac
by aravind b 05 Nov '06

05 Nov '06

Hello, I am using quantian *0.7.9.2 *live dvd and i am a total newbie to linux and to the mailing lists. I am really unable to use ginac. Firstly, locate ginac-config doesnt give any results. whereas locate ginac gives: *locate: warning: database `/var/cache/locate/locatedb' is more than 8 days old /usr/lib/libginac-1.3.so.2 /usr/lib/libginac-1.3.so.2.1.0 /usr/share/doc/ginac-tools /usr/share/doc/ginac-tools/AUTHORS /usr/share/doc/ginac-tools/changelog.Debian.gz /usr/share/doc/ginac-tools/changelog.gz /usr/share/doc/ginac-tools/copyright /usr/share/doc/ginac-tools/NEWS.gz /usr/share/doc/ginac-tools/README /usr/share/doc/libginac1.3c2a /usr/share/doc/libginac1.3c2a/AUTHORS /usr/share/doc/libginac1.3c2a/changelog.Debian.gz /usr/share/doc/libginac1.3c2a/changelog.gz /usr/share/doc/libginac1.3c2a/copyright /usr/share/doc/libginac1.3c2a/NEWS.gz /usr/share/doc/libginac1.3c2a/README /usr/share/menu/ginac-tools /usr/share/pixmaps/ginac.xpm /var/lib/dpkg/info/ginac-tools.list /var/lib/dpkg/info/ginac-tools.md5sums /var/lib/dpkg/info/ginac-tools.postinst /var/lib/dpkg/info/ginac-tools.postrm /var/lib/dpkg/info/libginac1.3c2.list /var/lib/dpkg/info/libginac1.3c2.postrm /var/lib/dpkg/info/libginac1.3c2a.list /var/lib/dpkg/info/libginac1.3c2a.md5sums /var/lib/dpkg/info/libginac1.3c2a.postinst /var/lib/dpkg/info/libginac1.3c2a.postrm /var/lib/dpkg/info/libginac1.3c2a.shlibs *Guys, please help me out here. How do i link ginac to my C++ code using g++? Thanks a lot for going through this mail with regards, aravind

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