您如何阅读以下
MATLAB代码?
#1
K>> [p,d]=eig(A) // Not sure about the syntax. p = 0.5257 -0.8507 -0.8507 -0.5257 d = // Why do you get a matrix? 0.3820 0 0 2.6180
#2
K>> p,d=eig(A) // Not sure about the syntax. p = 0.5257 -0.8507 -0.8507 -0.5257 d = // Why do you get a vector? 0.3820 2.6180 哪里
A = 2 1 1 1
回答:
在第二种情况下, p,d=eig(A)
MATLAB仅打印情况1中先前计算的p值,然后运行命令d=eig(A) 。
在运行案例2之前,请尝试
>> clear pd 如果然后运行p,d=eig(A) ,它将返回一个错误,指出p是未定义的函数或变量。
从help eig :
E = EIG(X) is a vector containing the eigenvalues of a square matrix X. [V,D] = EIG(X) produces a diagonal matrix D of eigenvalues and a full matrix V whose columns are the corresponding eigenvectors so that X*V = V*D. 请注意,没有V,D = EIG(X)选项。返回多个值的MATLAB函数将使用以下格式对它们进行分组:
[ ] = function()
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