5-D核密度估计在R中使用“kde”函数。

I want to perform Kernel density estimate for a 5-dimensional data (x,y,z,time,size) by using "kde" function in "ks" library of R. In it's manual it says it can do Kernel density estimate for 1- to 6-dimensional data (Page 24 of manual: I want to perform Kernel density estimate for a