全部悬赏
发布悬赏
专家入驻
注册领666大礼包
Mathematica怎么计算特征向量特征值?
"不需要特征向量就不要去算。
In[1]:= Eigenvalues[{{a, b}, {c, d}}]
Out[1]= {1/2 (a + d - Sqrt[a^2 + 4 b c - 2 a d + d^2]),
1/2 (a + d + Sqrt[a^2 + 4 b c - 2 a d + d^2])}
需要就是
In[1]:= Eigensystem[{{a, b}, {c, d}}]
Out[1]= {{1/2 (a + d - Sqrt[a^2 + 4 b c - 2 a d + d^2]),
1/2 (a + d + Sqrt[a^2 + 4 b c - 2 a d + d^2])}, {{-((-a + d + Sqrt[
a^2 + 4 b c - 2 a d + d^2])/(2 c)),
1}, {-((-a + d - Sqrt[a^2 + 4 b c - 2 a d + d^2])/(2 c)), 1}}}"
¥99
¥19.9
¥100
¥150
¥200
¥260
¥220
¥90
¥15
¥50
免费
¥65
¥500
¥60
¥130
¥30
¥2000
TOP
"不需要特征向量就不要去算。
In[1]:= Eigenvalues[{{a, b}, {c, d}}]
Out[1]= {1/2 (a + d - Sqrt[a^2 + 4 b c - 2 a d + d^2]),
1/2 (a + d + Sqrt[a^2 + 4 b c - 2 a d + d^2])}
需要就是
In[1]:= Eigensystem[{{a, b}, {c, d}}]
Out[1]= {{1/2 (a + d - Sqrt[a^2 + 4 b c - 2 a d + d^2]),
1/2 (a + d + Sqrt[a^2 + 4 b c - 2 a d + d^2])}, {{-((-a + d + Sqrt[
a^2 + 4 b c - 2 a d + d^2])/(2 c)),
1}, {-((-a + d - Sqrt[a^2 + 4 b c - 2 a d + d^2])/(2 c)), 1}}}"