参数:type
a character string, denoting the value to compute the density for. Currently the only valid types are "length" and "score"
一个字符串,表示的值来计算的密度。目前唯一有效的类型是“长度”和“得分”
参数:...
additional arguments to be passed to density
被传递density的其他参数
值----------Value----------
A kernel density object as defined by density
核密度对象定义的density