该楼层疑似违规已被系统折叠隐藏此楼查看此楼
x=rand(5)
x=
0.54700.18350.92940.30630.6443
0.29630.36850.77570.50850.3786
0.74470.62560.48680.51080.8116
0.18900.78020.43590.81760.5328
0.68680.08110.44680.79480.3507
>>a=rand(5)
a=
0.93900.20770.19480.31110.9797
0.87590.30120.22590.92340.4389
0.55020.47090.17070.43020.1111
0.62250.23050.22770.18480.2581
0.58700.84430.43570.90490.4087
>>y=x*a
y=
1.75461.22120.65711.37911.0621
1.56660.97470.55411.20270.8242
2.30951.37540.83941.84761.5218
1.92241.11790.70581.60001.0048
1.66240.85680.56210.94501.1066
>>x1=y*inv(a)
x1=
0.54700.18350.92940.30630.6443
0.29630.36850.77570.50850.3786
0.74470.62560.48680.51080.8116
0.18900.78020.43590.81760.5328
0.68680.08110.44680.79480.3507
>>norm(x1-x)
ans=
3.1081e-015误差很小了
x2=y/a(与x2=y*inv(a)等价)
x2=
0.54700.18350.92940.30630.6443
0.29630.36850.77570.50850.3786
0.74470.62560.48680.51080.8116
0.18900.78020.43590.81760.5328
0.68680.08110.44680.79480.3507
>>norm(x2-x)
ans=
1.7692e-015误差很小了