特征向量（谱）分解
我试图找到一个 C 代码程序，它允许我计算方阵的特征值（谱）分解。我特别试图找到最高特征值（及其相关特征值）位于第一列的代码。
我需要按此顺序输出的原因是因为我正在尝试计算特征向量中心性，因此我只需要计算与最高特征值相关的特征向量。提前致谢！
I am trying to find a program in C code that will allow me to compute a eigenvalue (spectral) decomposition for a square matrix. I am specifically trying to find code where the highest eigenvalue (and therefore its associated eigenvalue) are located int the first column.
The reason I need the output to be in this order is because I am trying to compute eigenvector centrality and therefore I only really need to calculate the eigenvector associated with the highest eigenvalue. Thanks in advance!
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无论如何，我建议使用专用的线性代数包，例如 Lapack （Fortran，但可以从C) 或 CLapack。两者都是免费的，并提供几乎所有特征值问题的例程。如果矩阵很大，最好利用其稀疏性，例如使用 Arpack。所有这些库都倾向于根据特征值（实数或纯虚数特征值）对特征向量进行排序。
In any case I would recommend to use a dedicated linear algebra package like Lapack (Fortran but can be called from C) or CLapack. Both are free and offer routines for almost any eigenvalue problem. If the matrix is large it might be preferable to exploit its sparseness e.g. by using Arpack. All of these libraries tend to sort the eigenvectors according to the eigenvalues if they can (real or purely imaginary eigenvalues).
请参阅《C 语言数值食谱》一书
See the book "Numerical recipes in C"
排名第一的 google 搜索（搜索：特征值分解代码 C#）
http://crsouza.blogspot.com/2010/06/generalized-eigenvalue-decomposition-in.html
没有帮助？
And the #1 google hit (search: eigenvalue decomposition code C#)
http://crsouza.blogspot.com/2010/06/generalized-eigenvalue-decomposition-in.html
does not help?