现代数值数学和计算习题答案(同济版)(4)

A

sort

A

MatLab

A

(

)

n=size(A,1);fori=1:n-1,

forj=i+1:n,

ifabs(A(i,i))<abs(A(j,j)),

A(:,[i,j])=A(:,[j,i]);A([i,j],:)=A([j,i],:);endendend

A

7.

x=(x1,x2,...,xn)

Euclide1

x =

nx2i

i=1

2

2

=

,

MatLab

x = x(1:n 1) ,x(n) ,

x=(x1,x2)

1

x1,

1,x2