DX(1) General Commands Manual DX(1)
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 Exec-
utive, 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 gen-
eral 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 cus-
tom 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 auto-
matically 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 environ-
ment 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 hexidecimal (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 gener-
ated 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 pur-
poses, 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 execu-
tion 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 DXhwd-
dOGL.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 execu-
tive. 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 recieve 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 situ-
ation 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 environ-
ment 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 cus-
tom.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.
IBM Visualization Data Explorer DX(1)