|   | 
				
					
	
		  | 
	 
	
		| Paper: | 
		The IDL Astronomy User's Library | 
	 
	
		| Volume: | 
		77, Astronomical Data Analysis Software and Systems IV | 
	 
	
		| Page: | 
		437 | 
	 
	
		| Authors: | 
		Landsman, W. B. | 
	 
	
	
		| Abstract: | 
		IDL (Interactive Data Language) is a commercial plotting, image processing, and programming language that is widely used in astronomy. Although IDL is a powerful language for spectral and image processing, it does not contain applications specific to astronomy. Therefore, in 1990 I created the IDL Astronomy User's Library (AUL), which is a collection of astronomy-related procedures written in the IDL language, available via anonymous FTP from idlastro.gsfc.nasa.gov. I summarize recent developments in the IDL language of particular interest to astronomers. I then mention some additions to the IDL Astronomy Library since the previous report of Landsman (1993). Finally, I critically examine possible drawbacks to the use of IDL for astronomical data analysis. | 
	 
	
		| 
			
			
		 | 
	 
	
		  | 
	 
 
					 
				 | 
				  |