a=rand(100,100);

tic

[b,pos]=sort(a(:,1));

aa=a(pos,:);

toc

tic

A=sortrows(a,1);

toc

det(aa-A)

前面的演算法時間要短，效果是一樣的

Elapsedtimeis0.000110seconds.

Elapsedtimeis0.000259seconds.

ans=

0

用個小矩陣檢測下

a=magic(5);

tic

[b,pos]=sort(a(:,1));

aa=a(pos,:)

toc

tic

A=sortrows(a,1)

toc

det(aa-A)

a=

17241815

23571416

46132022

101219213

11182529

aa=

46132022

101219213

11182529

17241815

23571416

Elapsedtimeis0.000133seconds.

A=

46132022

101219213

11182529

17241815

23571416

Elapsedtimeis0.000223seconds.

ans=

0