**NUMCMP****NUMCMP**, `Label`

**Compresses the numbering of defined items.**

`Label`

Items to be compressed:

**NODE**
| — | Node numbers |

**ELEM**
| — | Element numbers |

**KP**
| — | Keypoint numbers |

**LINE**
| — | Line numbers |

**AREA**
| — | Area numbers |

**VOLU**
| — | Volume numbers |

**MAT**
| — | Material numbers |

**TYPE**
| — | Element type numbers |

**REAL**
| — | Real constant numbers |

**CP**
| — | Coupled set numbers |

**SECN**
| — | Section numbers |

**CE**
| — | Constraint equation numbers |

**ALL**
| — | All item numbers |

## Notes

The **NUMCMP** command effectively compresses
out unused item numbers by renumbering all the items, beginning with
one and continuing throughout the model. The renumbering order follows
the initial item numbering order (that is, compression lowers the
maximum number by "sliding" numbers down to take advantage of unused
or skipped numbers). All defined items are renumbered, regardless
of whether or not they are actually used or selected. Applicable
related items are also checked for renumbering as described for the
merge operation (**NUMMRG**).

Compressing material numbers (**NUMCMP**,ALL
or **NUMCMP**,MAT) does *not* update the material number referenced by either of the following:

A temperature-dependent convection or surface-to-surface
radiation load (**SF**, **SFE**, **SFL**, **SFA**)

Real constants for multi-material
elements (such as SOLID65)

Compression is usually not required unless memory
space is limited and there are large gaps in the numbering sequence.