---
name: "geev_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/geev_comp_grp"
---

# geev\_comp\_grp(3)

Eig computational routines

## NAME

geev\_comp\_grp - Eig computational routines

## SYNOPSIS

### Topics

**gebal:          balance matrix**\
 **gehrd:          reduction to Hessenberg**\
 **gehd2:          reduction to Hessenberg, level 2**\
 **lahr2:          step in gehrd**\
 **{un,or}ghr:     generate Q from gehrd**\
 **{un,or}mhr:     multiply by Q from gehrd**\
 **gebak:          back-transform eigvec**\
 **hseqr:          Hessenberg eig, QR iteration**\
 **hsein:          Hessenberg inverse iteration for eigvec**\
 **trevc:          eigenvectors of triangular Schur form, old**\
 **trevc3:         eigenvectors of triangular Schur form, blocked**\
 **laln2:          1x1 or 2x2 solve, step in trevc**\
 **trsyl:          Sylvester equation**\
 **trsyl3:         Sylvester equation, level 3**\
 **lasy2:          Sylvester equation**\
 **trsna:          eig condition numbers**\
 **laqtr:          quasi-triangular solve**\
 **trexc:          reorder Schur form**\
 **trsen:          reorder Schur form**\
 **laexc:          reorder Schur form**\
 **lanv2:          2x2 Schur factor**\
 **— hseqr auxiliary —**\
 **laein:          eigvec by Hessenberg inverse iteration**\
 **lahqr:          eig of Hessenberg, step in hseqr**\
 **laqr0:          eig of Hessenberg, step in hseqr**\
 **laqr1:          step in hseqr**\
 **laqr2:          step in hseqr**\
 **laqr3:          step in hseqr**\
 **laqr4:          eig of Hessenberg, step in hseqr**\
 **laqr5:          step in hseqr**\
 **iparmq:         set parameters for hseqr**\
 **— ggev3, gges3 auxiliary —**\
 **laqz0:          step in ggev3, gges3**\
 **laqz1:          step in ggev3, gges3**\
 **laqz2:          step in ggev3, gges3**\
 **laqz3:          step in ggev3, gges3**\
 **laqz4:          step in ggev3, gges3**\

## Detailed Description

## Author

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