From 75da254fc3f70d5bc5c377ee78b0354ab369dec7 Mon Sep 17 00:00:00 2001 From: Gael Guennebaud Date: Mon, 28 Jun 2010 00:42:57 +0200 Subject: * use transpose() instead of row vectors (more common use case) * add a word about noalias and performance for BLAS users --- doc/examples/tut_arithmetic_dot_cross.cpp | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) (limited to 'doc/examples/tut_arithmetic_dot_cross.cpp') diff --git a/doc/examples/tut_arithmetic_dot_cross.cpp b/doc/examples/tut_arithmetic_dot_cross.cpp index 0f8e45359..631c9a5e0 100644 --- a/doc/examples/tut_arithmetic_dot_cross.cpp +++ b/doc/examples/tut_arithmetic_dot_cross.cpp @@ -2,11 +2,14 @@ #include using namespace Eigen; +using namespace std; int main() { Vector3d v(1,2,3); Vector3d w(0,1,2); - std::cout << "Dot product: " << v.dot(w) << std::endl; - std::cout << "Cross product:\n" << v.cross(w) << std::endl; + cout << "Dot product: " << v.dot(w) << endl; + double dp = v.adjoint()*w; // automatic conversion of the inner product to a scalar + cout << "Dot product via a matrix product: " << dp << endl; + cout << "Cross product:\n" << v.cross(w) << endl; } -- cgit v1.2.3