Provided by: dx_4.4.4-10build2_amd64 
NAME
dx - start the Data Explorer visualization system. Optionally directly start the User Interface (dxui),
the executive (dxexec), the Data Prompter, the Module Builder or the Tutorial.
SYNOPSIS
dx [ -8bitcmap < private | shared | 0-1 > ]
[ -builder ]
[ -cache < on | off > ]
[ -colors < colors file > ]
[ -connect < host:port > ]
[ -data < path list > ]
[ -directory < dir > ]
[ -display < display name > ]
[ -dxroot < dir > ]
[ -echo ]
[ -edit ]
[ -encode ]
[ -exec < executable > ]
[ -execonly ]
[ -execute ]
[ -execute_on_change ]
[ -full ]
[ -file < filename > ]
[ -help ]
[ -highlight < on | off > ]
[ -host < host name > ]
[ -hwrender < gl | opengl > ]
[ -image ]
[ -include < path list > ]
[ -key < 64bit hex > ]
[ -license < type > ]
[ -local ]
[ -log < on | off > ]
[ -macros < path list > ]
[ -mdf < filename > ]
[ -memory < # of Mbytes > ]
[ -menubar ]
[ -metric ]
[ -modules < path list > ]
[ -morehelp ]
[ -nodeid ]
[ -optimize < memory | precision > ]
[ -outboarddebug ]
[ -processors ]
[ -program < filename > ]
[ -prompter ]
[ -readahead < on | off > ]
[ -script [ < script file > ] ]
[ -startup ]
[ -suppress ]
[ -timing < on | off >]
[ -trace < on | off > ]
[ -trialkey ]
[ -tutor ]
[ -uionly | -execonly ]
[ -verbose ]
[ -version]
dx -prompter ( start the Data Prompter )
[ -full ]
[ -file ] [ < header file name > ]
dx -builder ( start the Module Builder )
[ -file ] [ < .mb file name > ]
DESCRIPTION
dx is the command that starts the Data Explorer Startup Window, and optionally starts the Data Explorer
User Interface, Data Explorer Executive, Data Explorer Data Prompter, Data Explorer Module Builder or the
Data Explorer Tutorial.
The Data Explorer Startup Window is an X windows/Motif based application which allows easy access to the
other subsystemes of the Data Explorer visualization system.
The Data Explorer User Interface is an X windows/Motif based application that provides a visual
programming environment and an interface to the executive. The executive provides the computational
tools and mechanisms to create data visualizations. The
Data Explorer Data Prompter is an X windows/Motif based application that helps users import data in a
variety of formats, and provides general purpose visual programs to visual imported data, leading to a
shortened "time to first picture".
The Data Explorer Module Builder is an X windows/Motif based application that helps users build their own
modules to be included in a custom version of Data Explorer.
The Data Explorer Tutorial is an application that helps users learn to use Data Explorer by leading them
through a sequence of tasks. Users can easily skip around in the tutorial in order to concentrate on
tasks of most use to their work.
For a more complete description of the Data Explorer User Interface and Executive see the IBM
Visualization Data Explorer User's Guide. For a more complete description of the Data Explorer Data
Prompter see the IBM Visualization Data Explorer QuickStart Guide. For a more thorough description of
the Data Explorer Module Builder see the IBM Visualization Data Explorer Programmer's Reference.
OPTIONS
With no options the dx command starts the Startup Window, an X windows/Motif program from which the other
parts of the Data Explorer system can be started. The various command line options and environment
variables listed below can be specified to change the default behavior.
Options set by including them in the DXARGS environment variable are placed at the start of the command
line, followed by any options set by environment variables, followed by explicit command line arguments.
When conflicting options are given, the last option has precedence.
-8bitcmap < private | shared | 0-1 | -1 >
Overrides the DX8BITCMAP environment variable (see ENVIRONMENT VARIABLES below).
-cache < on | off >
Turn on or off the executive caching system. When the Data Explorer caching mechanism is enabled
the Data Explorer executive automatically caches the intermediate results generated during its
visualization computations. Unlike standard caching mechanisms, these results are accessed by
means of their functional derivation. This allows for automatic graph optimization and helps to
avoid the recomputation of previously utilized intermediates, especially when the Data Explorer
sequencer is being used. In certain rare instances, a machine with a small amount of memory may
want to disable this caching to conserve memory and reduce paging. Default = on.
-colors < colors file >
Override DXCOLORS environment variable (see ENVIRONMENT VARIABLES below).
-connect < host:port >
Start a distributed executive only (no user interface).
-data < path list >
Override DXDATA environment variable (see ENVIRONMENT VARIABLES below).
-directory < dir >
Cause the executive to be run in the given directory.
-display < display name >
Set the name of the X display to be used by the user interface and the executive.
-dxroot < dir >
Overrides the default dx root directory.
-echo < dir >
Echo the command lines without executing them.
-edit Cause the user interface to be started with the Visual Program Editor (VPE) window as the top
level window of the user interface (the top level window is denoted by an anchor in the upper left
hand corner). Also see -image, -startup, and -menubar.
-encode < filename >
Encode the given file into a binary format with a key (which must be specified with the -key
option). For example
dx -encode -key 1234567890abcdef foo.net The resulting file can only be encoded by the DX user
interface when the same key is used. For example
dx -image -key 1234567890abcdef foo-e.net
-exec < executive executable >
Use the given file as a replacement for the executive. This option allows a user to build and use
his/her own custom executive.
-execonly
Start the executive in remote mode in which it will then await a connection from the user
interface. The user interface is not started with this option. Also see -script.
-execute
Execute once after the user interface has made a connection with the executive.
-execute_on_change
Cause Data Explorer to go into execute-on-change mode at start up. Execute-on-change mode causes
the Visual Program to be executed any time any of the values (i.e. module inupts, interactor
values...) in the program change.
-file < filename >
Start the Data Prompter, Module Builder, or Data Explorer User Interface with the header file
filename.
-full When used with -prompter, starts the full Data Prompter.
-help Print a brief listing of options and usage for dx.
-highlight < on | off >
Turn on or off module execution highlighting. If highlighting is turned on, the user interface
will highlight each module as it is executed. Default = on.
-host < host name >
Override DXHOST environment variable (see ENVIRONMENT VARIABLES below).
-hwrender < gl | opengl >
Override the default hardware rendering choice on platforms where both are supported. Default is
opengl. Sets the DXHWMOD environment variable to either DXhwdd.o or DXhwddOGL.o.
-image Cause the user interface to be started with the image window as the top level window of the user
interface. Also, control panels that are configured to open automatically are opened. Also see
-edit, -startup and -menubar.
-include < path list >
Override DXINCLUDE environment variable (see ENVIRONMENT VARIABLES below).
-key < 64bit hex >
16 character hexadecimal (64bit) number that is used to encode and decode .net files. See -encode.
-license < type >
Force a specific license for either the user interface or executive. The following are valid
values for type:
runtime: forces a run-time license (UI or executive).
timed: forces a timed (limited function) license (UI only).
develop: forces a developer license (UI or executive).
-local Override the DXHOST environment variable (if set) and cause the executive to be run on the local
host. In the absence of the DXHOST environment variable, this is the default.
-log < on | off >
Turn on or off executive logging. If logging is on then the executive logs output to the file
dx.log in the directory where the executive is executing. Default = off.
-macros < path list >
Override the DXMACROS environment variable (see ENVIRONMENT VARIABLES below).
-menubar
Start Data Explorer with a menubar as the anchor window. Also, control panels that are configured
to open automatically are opened. See also -image, -edit, and -startup.
-mdf < mdf file >
Override the DXMDF environment variable (see ENVIRONMENT VARIABLES below).
-memory < # of MB >
Set the maximum amount of memory, in megabytes rounded up to a two megabyte boundary, that the
executive is able to allocate. Default = the amount of physical memory minus 8 MB.
-metric
Have the ui use metric units when possible, for example for setting the image size for printing
postscript images.
-modules < pathlist >
Set the list of directories to be searched for outboard modules.
-morehelp
Displays this information
-nodeid
print out the node id of the machine that the command is run on. The node id is used when
generating a license.
-optimize < memory | precision >
Select whether to minimize memory usage or produce more color-accurate images. When memory is
optimized, image objects are generated with 24 bits/pixel instead of 96, and ReadImage will
produce delayed color images if supported by the format. The default is precision.
-outboarddebug
Enable user to start outboard modules manually for debugging when they are called in a visual
program.
-processors
For Data Explorer SMP, sets the number of processors to use.
-program < programname >
Start the user interface with the visual program filename.
-prompter
Start the data prompter.
-readahead < on | off >
Specify whether or not the executive reads ahead in its input stream before executing the commands
it receives from the stream. If this is turned off, then the executive will execute each command
line as it is received. This is useful for certain debugging purposes, such as memory leak
detection. Default = on.
-script [ < script file > ]
Run just the executive in script mode. If a file name is provided then the executive reads and
executes commands from the given script and then terminates. If a file is not provided then when
the executive starts up it enters interactive mode where it waits for script commands. Also see
-execonly.
-startup
Start Data Explorer with the startup window as the initial window. This is the default. See also
-image, -edit, and -menubar.
-suppress
Do not open any control panels at start-up. This is used in -image mode and -menubar mode only.
-timed Start DX using a timed license.
-timing < on | off >
Turn on or off the executive timing mechanism. If enabled, then when the executive exits it will
list on standard output or the logging file timing statistics for each module that was used during
the course of execution. Default = off.
-trace < on | off >
Turn on or off the executive trace mechanism. When tracing is enabled the executive displays
informative messages about the execution sequence on either standard output or the log file if
logging is enabled. Default = off.
-trialkey
Determines the information necessary for generating a trialkey.
-tutor Start the Data Explorer tutorial.
-uionly
Cause the user interface to be started without making a connection to an executive.
-verbose
Echo commands in the dx script as they are executed.
-version
Print version numbers of various executables.
ENVIRONMENT VARIABLES
The following environment variables provide an alternate way to set certain of the command line options,
or alter the default behavior of Data Explorer in some way. Options set with environment variables are
overridden if the same option is also specified on the command line. Options set with DXARGS are
overridden by both environment variables and explicit command line options.
DX8BITCMAP
When Data Explorer displays images in 8-bit windows, it makes every effort to create an accurate
representation of the image using the default colormap shared among applications using 8-bit
windows. If the colors required by Data Explorer are not present in the colormap and there are
not enough free color cells available in the shared color map for their allocation, Data Explorer
will find approximations among the colors that are available. However, in certain circumstances,
the difference between the desired color and the approximation is found to be too great to be
acceptable. In such circumstances, DX will allocate a private colormap for more accurate results.
In this case, depending on your X server, you may need to move the mouse to select the Image or
Display window in order for the correct colors to appear. The -8bitcmap flag sets the level at
which the change to using a private colormap is made. The value of this parameter should be a
number between 0 and 1, or "private" or "shared", and it repressents the Euclidean distance in RGB
color space, normalized to 1, for the maximum allowed discrepancy. If you set this parameter to
1, then a private colormap will never be used. If you set it to -1, then a private colormap will
always be used. The default is 0.1.
DXARGS This contains the default set of arguments used by the dx script. The arguments are prepended to
those given to dx on the command line. This variable allows for the dx command to be easily
customized.
DXAXESMAXWIDTH
Sets the number of digits in axes tick labels at which a switch to scientific notation is made.
The default is 7.
DXCOLORS
This contains the name of an alternate file that contains mappings of color names to red, green,
blue triplets in a format like that of the default color file found in /usr/lpp/dx/lib/colors.txt.
DXDATA This contains a colon separated list of directories in which the executive will search for data
files. Also see the -data option.
DXDELAYEDCOLORS
If set to anything other than 0, enables ReadImage to create delayed color images if the image is
a tiff format image saved in a byte-with-colormap format or a gif image.
DXEXEC Specifies an executive to be run at start-up.
DXFLING
If DXFLING is set to 1, then for hardware-rendered images, in rotation mode and execute-on-change
mode, if you drag the mouse across the image, and release the mouse button outside the image, the
object in the image will begin to rotate, and will continue to rotate until you click inside the
image. The direction and speed of the mouse motion before release will affect the rotation
direction and rotation speed of the object in the window.
DXGAMMA
Sets the gamma correction for software-rendered images displayed to the screen using the Display
and Image tools. The default value is 2, except for 8-bit windows on the sgi architecture.
DXGAMMA_8BIT,
DXGAMMA_12BIT, DXGAMMA_24BIT sets the gamma correction factor for software-rendered images for the
windows with the indicated window depth. Overrides the value set by DXGAMMA.
DXHOST This contains the name of the host machine that will run the executive. If this is not set then a
default of "localhost" is used, unless the local host is a PVS console in which case the default
is to run the executive on the PVS. Also see the -host, -local and -server options.
DXHWGAMMA
Sets the gamma correction for hardware-rendered images displayed to the screen using the Display
and Image tools. The default value is 2.
DXHWMOD
Specifies the name of the hardware rendering library to use when more than one is supported.
Should be either DXhwdd.o or DXhwddOGL.o.
DXINCLUDE
This contains a colon separated list of directories in which the executive will search for
"included" scripts. Also see the -include option.
DXMACROS
This contains a colon separated list of directories in which the user interface searches for
macros that will be automatically loaded. When running in script mode one must "include" all the
macros by hand prior to referencing them. Also see the -macros option.
DXMDF This contains the name of a module description file (mdf) that contains user defined modules for a
customized version of the executive. Also see the -mdf option.
DXMEMORY
sets the amount of memory (in megabytes) that can be used by the executive.
DXMODULES
This contains a colon separated list of directories in which the executive searches for outboard
modules. Also see the -modules option.
DX_NESTED_LOOPS
For faces, loops, and edges data, if set, allows loops other than the enclosing loop for a face to
be listed first. However, there is a consequent decrease in performance if this environment
variable is set.
DXNO_BACKING_STORE
If set to anything, disables framebuffer readbacks. Setting this environment variable may improve
performance of interaction with hardware rendered images, especially for machines for which
readback is slow. The default behavior is that framebuffer readbacks are enabled. If you set this
environment variable, not that some interactions using the Image tool will result in a black image
while interaction is taking place. However, if you are not using the Image tool, it is strongly
recommended that you set this environment variable.
DXPIXELTYPE
sets the image type to either 24-bit color images or floating-point-based 96-bit images (the
default). This affects the behavior of Render and ReadImage. This variable can be set to either
DXByte (24 bits) or DXFloat (96 bits). Setting this variable to DXByte will result in images
taking up less memory.
DXPROCESSORS
Sets the number of processors to be used for Data Explorer SMP.
DXRSH Specifies the remote shell command to use when connecting to other systems (such as those when
using distributed execution). The default is the the path to rsh.
DXRSH_NOENV
Prevents the remote "invoke dxexec" script from being written with a full carbon copy of the local
environment (only DISPLAY is set).
DXROOT Specifies the top-level directory for all the files and directories needed by Data Explorer.
DXSHMEM
If set to anything other than -1, forces shared memory to be used (if allowed by the
architecture). If set to -1, (if allowed by the architecture) will cause the data segment to
simply be extended. Please see Appendix C of the Data Explorer User Guide for more information.
DX_SOCKET_BUFSIZE
Allows the user to specify the size of the send and receive buffers for the socket connection
between the UI and the exec. This value is clamped to the max allowed by the system. This can fix
a problem where the executive and UI hang involving a deadlock situation in the socket
communication. The value assigned to it is passed as the parameter to setsockopt for SOL_SNDBUF
and SOL_RCVBUF. A typcial increased value may be 262144.
DX_USER_INTERACTOR_FILE
Specifies a file containing user interactors for use by the SuperviseState and SuperviseWindow
modules.
DX_WEB_BROWSER
Under UNIX specifies the web browser to launch for viewing the HTML documentation. Under Windows
and MacOS X setting this environment variable will launch the systems default web browser.
EXAMPLES
The next few examples assume that none of the DX environment variables have been set.
1. To start both the user interface and the executive with the network named cfd.net:
dx -edit -program cfd
2. To start and execute the visual program cfd.net in image mode with /usr/users/me and /usr/data as data
directories:
dx -image -execute -data '/usr/users/me:/usr/data' cfd
3. To run just the executive on the script named f15wing:
dx -script -file f15wing
4. To start the user interface and execute the user customized executive named mydxexec containing user
defined modules described in custom.mdf:
dx -edit -mdf custom.mdf -exec mydxexec
5. To start the Data Prompter :
dx -prompter
6. To start the Module Builder :
dx -builder
7. To start the Tutorial :
dx -tutorial
SEE ALSO
README* - The README file(s) found in the dx
installation directory are an added source of information. html/allguide.htm contains html
versions of the documentation.