diag靈活應用構造想要的矩陣

2017-01-16  by:CAE仿真在線  來源:互聯(lián)網(wǎng)

>> c

c =

4.6796
2.6499
1.8997
1.2721
1.1027

>> diag(c)

ans =

4.6796 0 0 0 0
0 2.6499 0 0 0
0 0 1.8997 0 0
0 0 0 1.2721 0
0 0 0 0 1.1027

>> diag(c,0)

ans =

4.6796 0 0 0 0
0 2.6499 0 0 0
0 0 1.8997 0 0
0 0 0 1.2721 0
0 0 0 0 1.1027

>> diag(c,1)%紅色字體為矩陣對角線元素,仔細觀察非零數(shù)值與對角線的位置關系

ans =

0 4.6796 0 0 0 0
0 0 2.6499 0 0 0
0 0 0 1.8997 0 0
0 0 0 0 1.2721 0
0 0 0 0 0 1.1027
0 0 0 0 0 0

>> diag(c,-2)

ans =

0 0 0 0 0 0 0
0 0 0 0 0 0 0
4.6796 0 0 0 0 0 0
0 2.6499 0 0 0 0 0
0 0 1.8997 0 0 0 0
0 0 0 1.2721 0 0 0
0 0 0 0 1.1027 0 0

>> s

s =

4.6796 0 0 0 0
0 2.6499 0 0 0
0 0 1.8997 0 0
0 0 0 1.2721 0
0 0 0 0 1.1027

>> diag(s)

ans =

4.6796
2.6499
1.8997
1.2721
1.1027

>> diag(s,0)

ans =

4.6796
2.6499
1.8997
1.2721
1.1027

>> diag(s,1)

ans =

0
0
0
0

>> diag(s,-2)

ans =

0
0
0

>> A

A =

0.5377 -1.3077 -1.3499
1.8339 -0.4336 3.0349
-2.2588 0.3426 0.7254
0.8622 3.5784 -0.0631
0.3188 2.7694 0.7147

>> diag(A,-2)

ans =

-2.2588
3.5784
0.7147

>> diag(A,1)

ans =

-1.3077
3.0349

>> diag(A,0)

ans =

0.5377
-0.4336
0.7254

>> diag(A)

ans =

0.5377
-0.4336
0.7254

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