---
name: "heev_comp_grp"
section: "3"
platform: "linux"
package: "lapack-doc"
version: "3.12.1-2"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/heev_comp_grp"
---

# heev\_comp\_grp(3)

Eig computational routines

## NAME

heev\_comp\_grp - Eig computational routines

## SYNOPSIS

### Topics

**— full —**\
 **disna:          eig condition numbers**\
 **{he,sy}trd:     reduction to tridiagonal**\
 **{he,sy}td2:     reduction to tridiagonal, level 2**\
 **latrd:          step in hetrd**\
 **{un,or}gtr:     generate Q from hetrd**\
 **{un,or}mtr:     multiply by Q from hetrd**\
 **{he,sy}trd\_2stage: reduction to tridiagonal, 2-stage**\
 **{he,sy}trd\_he2hb:   full to band (1st stage)**\
 **{he,sy}trd\_hb2st:   band to tridiagonal (2nd stage)**\
 **{hb,sb}2st\_kernels: band to tridiagonal (2nd stage)**\
 **lae2:           2x2 eig, step in steqr, stemr**\
 **laesy:          2x2 eig**\
 **laev2:          2x2 eig**\
 **lagtf:          LU factor of (T - λI)**\
 **lagts:          LU solve  of (T - λI) x = y**\
 **— packed —**\
 **{hp,sp}trd:     reduction to tridiagonal**\
 **{up,op}gtr:     generate Q from hetrd**\
 **{up,op}mtr:     multiply by Q from hptrd**\
 **— banded —**\
 **{hb,sb}trd:     reduction to tridiagonal**\

## Detailed Description

## Author

Generated automatically by Doxygen for LAPACK from the source code.