Conrad's DVO Worksheet

Introduction

The purpose of this page is to develop and introduction to using DVO from the complete perspective of a new non-astronomer user.

Logging into IPP and starting DV0

• Step 1) You need to do is log into an IPP machine that runs DVO. Example below:

$ssh -X -p 9005 ipp5u

Note: There is an X windows session and the port is 9005 and the machine ipp5u is only accessible internally to the cluster. If you need to ssh from an outside machine, see ​sshing.

• Step 2) Setup your psconfig to setup your ps lib configuration. Example below

  $psconfig --list
  PSCONFDIR : /home/panstarrs/ipp/psconfig
    Archives   : Archives
    lin64      : ipp-20120216
    lin64      : ipp-20120404
    lin64      : ipp-20120531-debug
    lin64      : ipp-20120531
    lin64      : ipp-eam
    lin64      : ipp-trunk
    bash       : psconfig
    csh        : psconfig
  $psconfig ipp-20120531
  

• Step 3) Launch DVO

  $dvo
  

Getting Started with DVO

If you have successfully launched dvo you will be see the dvo prompt. Several useful commands:

• ?? - Gives all the system environment variables available (i.e., HOME, PID, etc).
• ? - Shows all the available dvo commands .
• ! - Gives the ability to execute systems commands. Example:

  dvo: ! echo "Hello World"
  Hello World
  

• vectors - Tells you what variable vectors you have loaded into memory.
• help command - Gives specific information on the given command (if available). Examples:

  dvo: help imextract
  No help for: imextract
  dvo: help skyregion
  No help for: skyregion
  dvo: help tv
  
    tv [-log] (buffer) [zero range]
  
    display an image in the Ki'i window (X display program).  zero and
    range specify the data values corresponding to the color mapping.
    If they are not specified, the old values are used (default is 0,
    1024).
  
    If -log is specified the color mapping scale will be logarithmic.  
  
  
    See Also: Kii, rd, cursor
  
  

More commands

catdir /data/ipp005.0/gpc1/catdirs/SAS/20120510/

vectors

 echo RA[0]

writing to files

 write conrad.dat RA DEC -csv

Case Study: Trying to query for stacks with inaccurate data