格式：linspace(x1,x2,N)
功能：用于产生x1,x2之间的N点行矢量。其中x1,x2为起始值，N为元素个数。如果缺省N,默认N=100.
x=linspace(1,10,10);的效果和x=[1:1:10]类似
>> x1=[1:1:10]x1 =1 2 3 4 5 6 7 8 9 10>> x2=linspace(1,10,10);>> x2x2 =1 2 3 4 5 6 7 8 9 10>> x3=linspace(1,10)x3=1 至 11 列1.0000 1.0909 1.1818 1.2727 1.3636 1.4545 1.5455 1.6364 1.7273 1.8182 1.909112 至 22 列2.0000 2.0909 2.1818 2.2727 2.3636 2.4545 2.5455 2.6364 2.7273 2.8182 2.909123 至 33 列3.0000 3.0909 3.1818 3.2727 3.3636 3.4545 3.5455 3.6364 3.7273 3.8182 3.909134 至 44 列4.0000 4.0909 4.1818 4.2727 4.3636 4.4545 4.5455 4.6364 4.7273 4.8182 4.909145 至 55 列5.0000 5.0909 5.1818 5.2727 5.3636 5.4545 5.5455 5.6364 5.7273 5.8182 5.909156 至 66 列6.0000 6.0909 6.1818 6.2727 6.3636 6.4545 6.5455 6.6364 6.7273 6.8182 6.909167 至 77 列7.0000 7.0909 7.1818 7.2727 7.3636 7.4545 7.5455 7.6364 7.7273 7.8182 7.909178 至 88 列8.0000 8.0909 8.1818 8.2727 8.3636 8.4545 8.5455 8.6364 8.7273 8.8182 8.909189 至 99 列9.0000 9.0909 9.1818 9.2727 9.3636 9.4545 9.5455 9.6364 9.7273 9.8182 9.9091100 列10.0000
