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This is the command fieldrheolef that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

PROGRAM:

NAME


field -- plot a field

SYNOPSIS


field options filename[.field[.gz]]

DESCRIPTION


Read and output a finite element field from file.

EXAMPLE


field square.field
field square.field -bw
field box.field

INPUT FILE SPECIFICATION


filename
specifies the name of the file containing the input field.

- read field on standard input instead on a file.

-name when the field comes from standard input, the file base name is not known and is
set to "output" by default. This option allows to change this default. Useful
when dealing with output formats (graphic, format conversion) that creates
auxilliary files, based on this name.

-Idir

-I dir Add dir to the rheolef file search path. This option is usefull e.g. when the mesh
.geo and the .field fikes are in different directories. This mechanism initializes
a search path given by the environment variable `RHEOPATH'. If the environment
variable `RHEOPATH' is not set, the default value is the current directory.

-catchmark string
Jump accross the file to the specifield string. Label start at the begining of a
line, preceded by a `#' mark (see see catchmark(4)).

OUTPUT FILE FORMAT OPTIONS


-field output field on standard output stream in field text file format.

-gmsh output field on standard output stream in gmsh text file format.

-gmsh-pos
output field on standard output stream in gmsh-pos text file format, suitable for
mesh adaptation purpose.

-bamg-bb
output field on standard output stream in bamg-bb text file format, suitable for
mesh adaptation purpose.

-image-format string
The argument is any valid image format, such as bitmap png, jpg, gif, tif, ppm, bmp
or vectorial pdf, eps, ps, svg image file formats. this option can be used with
the paraview and the gnuplot renders. The output file is e.g. basename.png when
basename is the name of the mesh, or can be set with the -name option.

-resolution int int
The argument is a couple of sizes, for the image resolution. This option can be
used together with the -image-format for any of the bitmap image formats. This
option requires the paraview render.

GETTING INFORMATION


-min

-max print the min (resp. max) value of the scalar field and then exit.

RENDER OPTIONS


-gnuplot
use gnuplot tool. This is the default in one and two dimension.

-mayavi
use mayavi tool. This is the default for tridimensional geometries.

-paraview
use paraview tool. This is feature is under development.

RENDERING OPTIONS


-color

-gray

-black-and-white

-bw Use (color/gray scale/black and white) rendering. Color rendering is the default.

-label

-nolabel
Show or hide title, color bar and various anotations. Default is to show labels.

-elevation

-noelevation
For two dimensional field, represent values as elevation in the third dimension.
The default is no evelation.

-scale float
applies a multiplicative factor to the field. This is useful e.g. in conjonction
with the elevation option. The default value is 1.

-stereo

-nostereo
Rendering mode suitable for red-blue anaglyph 3D stereoscopic glasses. This option
is only available with mayavi and paraview.

-fill isoline intervals are filled with color. This is the default.

-nofill
draw isolines by using lines.

-volume

-novolume
for 3D data, render values using a colored translucid volume. This option requires
the paraview code.

-cut

-nocut Cut by a specified plane. The cutting plane is specified by its origin point and
normal vector. This option requires the mayavi or paraview code.

-origin float [float [float]]
set the origin of the cutting plane. Default is (0.5, 0.5, 0.5).

-normal float [float [float]]
set the normal of the cutting plane. Default is (1, 0, 0).

-iso [float]
do draw 3d isosurface. When the optional float is not provided, a median value is
used. This option requires the mayavi code.

-noiso do not draw isosurface.

-n-iso int
For 2D visualizations, the isovalue table contains regularly spaced values from
fmin to fmax, the bounds of the field.

-proj Convert all selected fields to Pk-continuous approximation by using a L2
projection.

-round [float]
Round the input up to the specifiexd precision. This option, combined with -field,
leads to a round filter. Usefull for non-regression test purpose, in order to
compare numerical results between files with a limited precision, since the full
double precision is machine-dependent.

-n-iso-negative int
The isovalue table is splitted into negatives and positives values. Assume there
is n_iso=15 isolines: if 4 is requested by this option, then, there will be 4
negatives isolines, regularly spaced from fmin to 0 and 11=15-4 positive isolines,
regularly spaced from 0 to fmax. This option is usefull when plotting e.g.
vorticity or stream functions, where the sign of the field is representative.

-subdivide int
When using a high order geometry, the number of points per edge used to draw a
curved element. Default value is the mesh order.

-deformation
Render vector-valued fields as deformed mesh using mayavi, paraview or gnuplot.
This is the default vector field representation.

-velocity
Render vector-valued fields as arrows using mayavi or paraview.

COMPONENT EXTRACTION AND DOMAIN REDUCTION


-comp int

-comp string
Extract the i-th component of a vector-valued field. For a tensor-valued field,
indexing components as "00", "01", "11"... is supported.

-domain name
Reduce the visualization to the specified domain.

OTHERS OPTIONS


-verbose
print messages related to graphic files created and command system calls (this is
the default).

-noverbose
does not print previous messages.

-clean clear temporary graphic files (this is the default).

-noclean
does not clear temporary graphic files.

-execute
execute graphic command (this is the default).

-noexecute
does not execute graphic command. Generates only graphic files. This is usefull in
conjuction with the -noclean command.

FIELD FILE FORMAT


It contains a header and a list values at degrees of freedom. The header contains the
field keyword followed by a line containing a format version number (presently 1), the
number of degrees of freedom (i.e. the number of values listed), the mesh file name
without the `.geo' extension the approximation (e.g. P1, P2, etc), and finaly the list of
values: A sample field file (compatible with the sample mesh example presented in command
manual; see geo(1)) writes:

field
1 4
square
P1
0.0
1.0
2.0
3.0

EXAMPLES


field cube.field -cut -normal 0 1 0 -origin 0.5 0.5 0.5 -vtk

This command send to vtk the cutted 2d plane of the 3d field.

field cube.field -cut -normal 0 1 0 -origin 0.5 0.5 0.5 -text > cube-cut.field

This command generates the cutted 2d field and its associated mesh.

field cube.field -iso 0.5 -plotmtv

This command draws the isosurface.

field cube.field -iso 0.5 -text > isosurf.geo

This command generates the isosurface as a 3d surface mesh in `.geo' format. This is
suitable for others treatments.

INPUT FILE FORMAT OPTIONS


TODO

FILE FORMAT CONVERSIONS


TODO

GETTING INFORMATION


TODO

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