libigl 🤝 stan math

Build

stan math will be downloaded upon cmake-ing and will pull in its own boost and sundial subdependencies and we'll also download tbb.

You can build with the usual

mkdir build
cd build
cmake ../
make

Run

From within the build directory just issue:

./example

A glfw app should launch displaying a knight with white lines indicating the computed gradients.

Known Issues

As far as I can tell, the

#include <stan/math.hpp>

line must come before any includes to Eigen. If you first include Eigen headers (or libigl which in turn include Eigen headers), then you could get errors like:

…/libigl-stan/build/_deps/stan/src/stan/stan/math/rev/fun/gp_exp_quad_cov.hpp:94:58: error: no member named 'adj' in 'stan::math::arena_matrix<Eigen::Matrix<stan::math::var_value<double>, -1, 1, 0>>'