Biowulf High Performance Computing at the NIH
IDL/ENVI on Biowulf

IDL provides powerful, core visualization and analysis functionality, and capabilities that allow data analysts and developers to leverage IDL's power in multiple software environments.

ENVI image analysis software is used to extract meaningful information from imagery to make better decisions.


Important Notes

Interactive job
Interactive jobs should be used for debugging, graphics, or applications that cannot be run as batch jobs.

Allocate an interactive session and run the program.
Sample session (user input in bold):

To run the IDL GUI, you should have connected to Biowulf with an Xwindows session. (see the Connect to Biowulf page for more info)
[user@biowulf]$ sinteractive --license=idl:6
salloc.exe: Pending job allocation 46116226
salloc.exe: job 46116226 queued and waiting for resources
salloc.exe: job 46116226 has been allocated resources
salloc.exe: Granted job allocation 46116226
salloc.exe: Waiting for resource configuration
salloc.exe: Nodes cn3144 are ready for job

[user@cn3144 ~]$ module load IDL

[user@cn3144 ~]$  idl    #command-line session
IDL> x = FINDGEN(41)/10 - 2
IDL> gauss = EXP(-x^2)
IDL> myPlot = BARPLOT(x, gauss, TITLE='Gaussian Distribution', $
   XTITLE='$\it x$', YTITLE='$\it f(x)$', YRANGE=[0,1.1])
IDL> myText = TEXT(0.75,0.85,'$\it f(x)=exp(-x^2)$', /DATA, FONT_SIZE=24)
IDL>myPlot.Save, "gaussian.png", BORDER=10, RESOLUTION=300, /TRANSPARENT
IDL> exit

[user@cn3144 ~]$ idlde # GUI interface

[user@cn3144 ~]$ exit salloc.exe: Relinquishing job allocation 46116226 [user@biowulf ~]$