Hallo,

first of all I want to congratulate you for the work you have been doing. I have been using it a lot for my PhD.
I have a long std::vector<double> and i want to treat some parts of it as eigen classes.
In particular I have this structure for my vector q:
stdVec = [ vector3d | quterniond | vector3d | vector3d] (13 elements in total)
I was trying to use eigen maps to avoid copying and increase performance in my code.
I do:

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   Eigen::Map< Eigen::Quaterniond > rot(&stdVec[3]);
   Eigen::Map< Eigen::Vector3d > vec2(&stdVec[7]);
   Eigen::Map< Eigen::Vector3d > vec3(&stdVec[10]);

there seems to be no problems when dealing with the two vectors but if I do

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rot = rot*rot

I get a segfault.
I have also tried a simpler thing like this:

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   std::vector<double> rotArray(5);
   Eigen::QuaternionMapd test(&rotArray[0]);
   test = test*test;

and it works fine while this:

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   std::vector<double> rotArray(5);
   Eigen::QuaternionMapd test(&rotArray[1]);
   test = test*test;

causes a segfault.
I guess this has something to do with the problems described here http://eigen.tuxfamily.org/dox/TopicStlContainers.html but this seems to be a "complementary" problem: I don't want vectors of eigen::quaterniond but a quaternionMapd using a vector.
the strange thing is that the other vectors don't seem to create problems.
Thanks for your help.

Works for me. Which Eigen version are you using? Perhaps you should upgrade to 3.1.3.