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

**gfscompare** [OPTION]

*FILE*
This manual page documents briefly the

**gfscompare** command.

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.

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).