求教一个Matlab 的语法问题.

A=rand(1,100);
>> b=A(1:10)
b =
Columns 1 through 8
0.8147 0.9058 0.1270 0.9134 0.6324 0.0975 0.2785 0.5469
Columns 9 through 10
0.9575 0.9649