Matlab-如何使用循环从一个向量创建两个向量

in this code I create a random vector with 100 values and I want to get two vector out of it: one with all the values under 1 and one with all the value above 1. I created this code, which works, but I wonder if there is a more efficient one, without to have the 2 vectors filled with 0in this code I create a random vector with 100