---
name: "gfscompare2D"
section: "1"
platform: "linux"
package: "gerris"
version: "20131206+dfsg-21+b3"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/gfscompare2D"
---

# gfscompare2D(1)

computes the difference between the solutions in FILE1 and FILE2 for variable VAR.

## NAME

gfscompare2D, gfscompare3D - computes the difference between the solutions in FILE1 and FILE2 for variable VAR.

## SYNOPSIS

**gfscompare** \[OPTION\]*FILE*

## DESCRIPTION

This manual page documents briefly the **gfscompare** command.

## OPTIONS

These programs follow the usual GNU command line syntax, with long options starting with two dashes (\`-'). A summary of options is included below.

- **-x, --mixed**

  Compute error only in mixed cells.

- **-m V, --min=V**

  Set minimum of color scale to V (used with -S).

- **-M V, --max=V**

  Set maximum of color scale to V.

- **-a, --abs**

  Output the absolute value of the error field.

- **-C, --constant**

  Apply a constant shift to one of the field, minimizing the error between the two fields (useful for pressure).

- **-w, --not-weighted**

  Do not use area-weighted norm estimation.

- **-c, --centered**

  Use error estimation for cell-centered variables.

- **-p P, --period=P**

  Shifts FILE1 by P along the x axis.

- **-H, --histogram**

  Output (error,volume) pairs for each cell used to compute the error norms.

- **-o, --output**

  Output a GTS representation of the error field.

- **-S, --squares**

  Output an OOGL representation of the error field.

- **-G, --gnuplot**

  Output a gnuplot representation of the error field.

- **-t, --triangulate**

  Use center of mass triangulation.

- **-l, --log**

  Output the log10 of the absolute value of the error field.

- **-f L, --full=L**

  Compare only leaf cells descendants of a cell full at level L or all full leaf cells if L = -1.

- **-r, --refined**

  Display error norm on the finest grid.

- **-n, --nocheck**

  Do not check solid fractions.

- **-g C, --gradient=C**

  Use the C component of the gradient of VAR.

- **-v, --verbose**

  Display difference statistics and other info.

- **-h, --help**

  Display the help and exit.

## AUTHOR

gfscompare was written by Stephane Popinet \<s.popinet@niwa.co.nz\>.

This manual page was written by Ruben Molina \<rmolina@udea.edu.co\>, for the Debian project (but may be used by others).