C++ project
PNS
QT
install
mkdir โp /usr/local/include
cd /usr/local/include
git clone https://gitlab.com/libeigen/eigen.git
cd eigen
git checkout 3.3.7
ls -d $PWD/Eigen
/usr/local/include/eigen/Eigen
http://eigen.tuxfamily.org/dox/group__TutorialLinearAlgebra.html
g++ -std=c++14 -O3 -Wno-deprecated-declarations ... test.cpp
Linear_interpolation
https://en.wikipedia.org/wiki/Linear_interpolation
https://en.wikipedia.org/wiki/Spline_interpolation
https://timodenk.com/blog/cubic-spline- interpolation/
http://jsxgraph.uni-bayreuth.de/wiki/index.php/Cubic_spline_interpolation