該樓層疑似違規已被系統折疊?隱藏此樓查看此樓

x=rand(5)

x?=

0.5470????0.1835????0.9294????0.3063????0.6443

0.2963????0.3685????0.7757????0.5085????0.3786

0.7447????0.6256????0.4868????0.5108????0.8116

0.1890????0.7802????0.4359????0.8176????0.5328

0.6868????0.0811????0.4468????0.7948????0.3507

>>?a=rand(5)

a?=

0.9390????0.2077????0.1948????0.3111????0.9797

0.8759????0.3012????0.2259????0.9234????0.4389

0.5502????0.4709????0.1707????0.4302????0.1111

0.6225????0.2305????0.2277????0.1848????0.2581

0.5870????0.8443????0.4357????0.9049????0.4087

>>?y=x*a

y?=

1.7546????1.2212????0.6571????1.3791????1.0621

1.5666????0.9747????0.5541????1.2027????0.8242

2.3095????1.3754????0.8394????1.8476????1.5218

1.9224????1.1179????0.7058????1.6000????1.0048

1.6624????0.8568????0.5621????0.9450????1.1066

>>?x1=y*inv(a)

x1?=

0.5470????0.1835????0.9294????0.3063????0.6443

0.2963????0.3685????0.7757????0.5085????0.3786

0.7447????0.6256????0.4868????0.5108????0.8116

0.1890????0.7802????0.4359????0.8176????0.5328

0.6868????0.0811????0.4468????0.7948????0.3507

>>?norm(x1-x)

ans?=

3.1081e-015誤差很小了

x2=y/a?(與x2=y*inv(a)等價)

x2?=

0.5470????0.1835????0.9294????0.3063????0.6443

0.2963????0.3685????0.7757????0.5085????0.3786

0.7447????0.6256????0.4868????0.5108????0.8116

0.1890????0.7802????0.4359????0.8176????0.5328

0.6868????0.0811????0.4468????0.7948????0.3507

>>?norm(x2-x)

ans?=

1.7692e-015誤差很小了

總結

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