# Tensor Component Operations and Extraction

Functions are provided for operating on and extracting individual components of tensor structures.

Component[tens,q] | extract the spherical tensor component tens_{q} |

Component[vec,i] | extract the Cartesian vector component vec_{i} |

Component[op,m,n] | extract the matrix element op_{mn}from an operator in the Zeeman basis |

Component[dec,k] | extract the spherical tensor of rank k from the tensor decomposition dec |

Component[dec,k,q] | extract the spherical tensor component of rank k and index q from a tensor decomposition |

Components[expr] | return a list of all components of a spherical tensor or matrix operator |