内容简介作者简介 - 科学与工程计算系

1 4 7
2 5 8
3 6 9
b=[1 2 3];A_b1=A-b([1 1 1],:)
A_b1 =
0 2 4
1 3 5
2 4 6
A_b2=A-repmat(b,3,1)
A_b2 =
0 2 4
1 3 5
2 4 6
A_b3=[A(:,1)-b(1),A(:,2)-b(2),A(:,3)-b(3)]
A_b3 =
0 2 4
1 3 5
2 4 6
【例 2.10-5】逻辑函数的运用示例。
randn('state',1),R=randn(3,6)
R =
0.8644 0.8735 -1.1027 0.1684 -0.5523 -0.6149
0.0942 -0.4380 0.3962 -1.9654 -0.8197 -0.2546
-0.8519 -0.4297 -0.9649 -0.7443 1.1091 -0.2698
L=abs(R)1.5
L =
0 0 0 1 0 0
1 1 1 1 0 1
0 1 0 0 0 1
R(L)=0
R =
0.8644 0.8735 -1.1027 0 -0.5523 -0.6149
0 0 0 0 -0.8197 0
-0.8519 0 -0.9649 -0.7443 1.1091 0
s=(find(R==0))'
s =
2 5 6 8 10 11 17 18
R(s)=111
R =
0.8644 0.8735 -1.1027 111.0000 -0.5523 -0.6149
111.0000 111.0000 111.0000 111.0000 -0.8197 111.0000
-0.8519 111.0000 -0.9649 -0.7443 1.1091 111.0000
[ii,jj]=find(R==111);
disp(ii'),disp(jj')
2 2 3 2 1 2 2 3
1 2 2 3 4 4 6 6
2.11 高维数组
11