http://commons.apache.org/proper/commons-math/download_math.cgi
http://www.cnblogs.com/lxchutao/p/3203905.html
http://www.korf.co.uk/spline.pdf
https://jetcracker.wordpress.com/2014/12/26/constrained-cubic-spline-java/
http://www.2cto.com/kf/201409/330281.html
一个软件
http://www.cnblogs.com/lxchutao/p/3203905.html
http://www.paulinternet.nl/?page=bicubic
矩阵 求逆
http://www.codelast.com/?p=1288