https://baike.so.com/doc/911932-963915.html
半变异函数可定义为:γ(h)=12N(h)∑N(h)i=12 (2)式中:N(h)是以向量h相隔的实验数据对的数据对数目
https://wenku.baidu.com/view/f9de504b2b160b4e767fcf8d.html
https://wenku.baidu.com/view/e8384d85951ea76e58fafab069dc5022abea466f.html?rec_flag=default&sxts=1555034611819
