RDD模型中，想要设置自己的带宽。

但是，默认值（100）总是会出现。能否消除默认值，让我自己设置的带宽成为唯一的参数？

mbw(numlist) specifies a list of multiplesfor bandwidths, in percentage terms. The default is "100 50 200" (i.e. half and twice the requestedbandwidth) and 100 is always included in the list, regardless of whether it isspecified.