作业帮matlab含参数矩阵特征方程求法矩阵如下D=[ s+2, s, s-1][ s-1, s+1, s-1][ s-1, s-2, s+1]det(D)后结果是2*s-14.但是实际结果应该是s^4+2s^3-10s^2-28s-14
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![matlab含参数矩阵特征方程求法矩阵如下D=[ s+2, s, s-1][ s-1, s+1, s-1][ s-1, s-2, s+1]det(D)后结果是2*s-14.但是实际结果应该是s^4+2s^3-10s^2-28s-14](/uploads/image/z/7156641-57-1.jpg?t=matlab%E5%90%AB%E5%8F%82%E6%95%B0%E7%9F%A9%E9%98%B5%E7%89%B9%E5%BE%81%E6%96%B9%E7%A8%8B%E6%B1%82%E6%B3%95%E7%9F%A9%E9%98%B5%E5%A6%82%E4%B8%8BD%3D%5B+s%2B2%2C+++s%2C+s-1%5D%5B+s-1%2C+s%2B1%2C+s-1%5D%5B+s-1%2C+s-2%2C+s%2B1%5Ddet%28D%29%E5%90%8E%E7%BB%93%E6%9E%9C%E6%98%AF2%2As-14.%E4%BD%86%E6%98%AF%E5%AE%9E%E9%99%85%E7%BB%93%E6%9E%9C%E5%BA%94%E8%AF%A5%E6%98%AFs%5E4%2B2s%5E3-10s%5E2-28s-14)
matlab含参数矩阵特征方程求法矩阵如下D=[ s+2, s, s-1][ s-1, s+1, s-1][ s-1, s-2, s+1]det(D)后结果是2*s-14.但是实际结果应该是s^4+2s^3-10s^2-28s-14
matlab含参数矩阵特征方程求法
矩阵如下
D=
[ s+2, s, s-1]
[ s-1, s+1, s-1]
[ s-1, s-2, s+1]
det(D)后结果是2*s-14.但是实际结果应该是s^4+2s^3-10s^2-28s-14
matlab含参数矩阵特征方程求法矩阵如下D=[ s+2, s, s-1][ s-1, s+1, s-1][ s-1, s-2, s+1]det(D)后结果是2*s-14.但是实际结果应该是s^4+2s^3-10s^2-28s-14
兄弟,你的那个算错了吧.
>>
clear;
syms s
D=[s+2,s,s-1;s-1,s+1,s-1;s-1,s-2,s+1]
D =
[ s + 2,s,s - 1]
[ s - 1,s + 1,s - 1]
[ s - 1,s - 2,s + 1]
>> det(D)
ans =
17*s - 5
[ s + 2,s,s - 1]
[ s - 1,s + 1,s - 1]
[ s - 1,s - 2,s + 1]
--------------
[ s + 2,s,s - 1]
[ s - 1,s + 1,s - 1]
[ 0,-3,2]
--------
[ s + 2,s,s - 1]
[ -3,1,0]
[ 0,-3,2]
----------
[ s + 2,s,s - 1]
[ -3,1,0]
[ 0,-3,2]
-------
det(D)=2(s+2)+9(s-1)+0 -(-6s)-0-0
=
17*s - 5