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Joseph
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mex not finding eigen library

Asked by Joseph
on 12 Aug 2018
Latest activity Edited by Walter Roberson
on 12 Aug 2018
I'm trying to use the Eigen 3.3.5 library with mex using Matlab2018a and OS X 10.13.6 and gcc 4.2.1. I installed it into /usr/local/lib using cmake and also put a symbolic link to it in /usr/local/include. I named the directory eigen. The terminal command gcc -xc -E -v - indicates that /usr/local/include is on the include path for gcc. Nonetheless, the command mex ep_bootdat.c (which has #include <Eigen>) results in "error: 'Eigen' file not found" I've also tried #include <eigen/Eigen> and #include <eigen>. I've also tried mex -I/usr/local/include/eigen/ ep_bootdat.c. Nothing seems to help. Can anyone suggest what might be going wrong?

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2 Answers

Answer by Joseph
on 12 Aug 2018
Edited by Walter Roberson
on 12 Aug 2018
 Accepted Answer

okay, after much mucking around, I found the solution, which was #include <Eigen/Dense> in the .c file and mex ep_bootdat.c -I/usr/local/include/eigen3/ as the Matlab invocation. eigen3 was placed in /usr/local/include by the "make install" command that one is supposed to do after the cmake command, according to the eigen INSTALL documenation.

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Answer by Joseph
on 12 Aug 2018
Edited by Walter Roberson
on 12 Aug 2018

footnote - apparently it needs to be C++ (as in ep_bootdat.cc -I/usr/local/include/eigen3/) otherwise it errors out with a:
/usr/local/include/eigen3/Eigen/Core:82:12: fatal error: 'new' file not found
#include <new>

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