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 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.

Overrides the DX8BITCMAP environment variable (see ENVIRONMENT
    VARIABLES below).

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.

Override DXCOLORS environment variable (see ENVIRONMENT VARIABLES below).

Start a distributed executive only (no user interface).

Override DXDATA environment variable (see ENVIRONMENT VARIABLES below).

Cause the executive to be run in the given directory.

Set the name of the X display to be used by the user interface and the
    executive.

Overrides the default dx root directory.

Echo the command lines without executing them.

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 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

Use the given file as a replacement for the executive.
    This option allows a user to build and use his/her own custom executive.

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 once after the user interface has made a connection with
    the executive.

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.

Start the Data Prompter, Module Builder, or Data Explorer User Interface
    with the header file filename.

When used with -prompter, starts the full Data Prompter.

Print a brief listing of options and usage for
    dx.

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.

Override DXHOST environment variable (see ENVIRONMENT VARIABLES below).

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.

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.

Override DXINCLUDE environment variable (see ENVIRONMENT VARIABLES below).

16 character hexadecimal (64bit) number that is used
    to encode and decode .net files. See -encode.

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).

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.

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.

Override the DXMACROS environment variable (see ENVIRONMENT VARIABLES below).

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.

Override the DXMDF environment variable (see ENVIRONMENT VARIABLES below).

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.

Have the ui use metric units when possible, for example for
    setting the image size for printing postscript images.

Set the list of directories to be searched for outboard modules.

Displays this information

print out the node id of the machine that the command is run on.
    The node id is used when generating a license.

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.

Enable user to start outboard modules manually for debugging when
    they are called in a visual program.

For Data Explorer SMP, sets the number of processors to use.

Start the user interface with the visual program filename.

Start the data prompter.

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.

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.

Start Data Explorer with the startup window as the initial window. This
    is the default. See also -image, -edit, and -menubar.

Do not open any control panels at start-up. This is used in -image mode
    and -menubar mode only.

Start DX using a timed license.

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.

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.

Determines the information necessary for generating a trialkey.

Start the Data Explorer tutorial.

Cause the user interface to be started without making a connection
    to an executive.

Echo commands in the
    dx script as they are executed.

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.

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 represents 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.

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.

Sets the number of digits in axes tick labels at which a switch to
    scientific notation is made. The default is 7.

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.

This contains a colon separated list
    of directories in which the executive will search for data files. Also see the -data option.

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.

Specifies an executive to be run at start-up.

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.

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.

sets the gamma correction factor for software-rendered images for
    the windows with the indicated window depth. Overrides the value set by DXGAMMA.

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.

Sets the gamma correction for hardware-rendered images displayed
    to the screen using the Display and Image tools. The default value is 2.

Specifies the name of the hardware rendering library to use when more
    than one is supported. Should be either DXhwdd.o or DXhwddOGL.o.

This contains a colon separated list
    of directories in which the executive will search for "included" scripts. Also see the -include option.

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.

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.

sets the amount of memory (in megabytes) that can be used by
    the executive.

This contains a colon separated list
    of directories in which the executive searches for outboard modules. Also see the -modules option.

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.

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.

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.

Sets the number of processors to be used for Data Explorer SMP.

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.

Prevents the remote "invoke dxexec" script from being written with a full
    carbon copy of the local environment (only DISPLAY is set).

Specifies the top-level directory for all the files and directories
    needed by Data Explorer.

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.

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.

Specifies a file containing user interactors for use by the
    SuperviseState and SuperviseWindow modules.

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.