---
name: "gbase"
section: "1"
platform: "linux"
package: "scotch"
version: "7.0.17-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/gbase"
---

# gbase(1)

sets the base value of a source graph

## NAME

**gbase** - sets the base value of a source graph

## SYNOPSIS

```
gbase [options] bval [igfile] [ogfile]
```

## DESCRIPTION

**The gbase program allows one to set to** *bval* **the base value of a** **source graph, that is, the starting index used to number its** **vertices and edges. The base value can be set to 0 or 1, so that** **graphs can be easily imported from and/or exported to tools written** **in C or Fortran. Scotch can handle graphs irrespective of their base** **value.**

**When the proper libraries have been included at compile time, gbase** **can directly handle compressed graphs, both as input and output. A** **stream is treated as compressed whenever its name is postfixed with** **a compressed file extension, such as in 'brol.grf.bz2' or '-.gz'. The** **compression formats which can be supported are the bzip2 format** **('.bz2'), the gzip format ('.gz'), and the lzma format ('.lzma').**

## OPTIONS

- **-h**

  **Display some help.**

- **-V**

  **Display program version and copyright.**

## EXAMPLE

**Set the base of graph 'brol.grf' to 1, and write the modified graph** **to file 'brol\_b1.grf'.**

```
    $ gbase 1 brol.grf brol_b1.grf
```

## SEE ALSO

**[gcv(1)](/gcv/1.md), [gmk\_hy(1)](/gmk_hy/1.md), [gmk\_msh(1)](/gmk_msh/1.md), [gtst(1)](/gtst/1.md), [gmap(1)](/gmap/1.md), [gord(1)](/gord/1.md).**

**Scotch user's manual.**

## AUTHOR

**Francois Pellegrini \<francois.pellegrini@labri.fr\>**