用于统计任一英文文档中26个字母的统计频率，得到频率矩阵-Second, it fuses the features of the first singular value component and the second one, and then gets the complex feature vectors which reflect not only the statistic frequency but also the sequential structure of letters

图论的相关MATLAB CODE 非常好用-grBase- find all bases of digraph grCoBase- find all contrabases of digraph grCoCycleBasis- find all independent cut-sets for a connected graph grColEdge- solve the color problem for graph edges grColVer- sol

find all bases of digraph

GrTheory - Graph Theory Toolbox. Functions: grBase - find all bases of digraph grCoBase - find all contrabases of digraph grCoCycleBasis - find all independent cut-sets for a connected graph grColEdge - solve the color problem for graph