Idl Signal Processing Library 1.0

This document serves as an introduction to the small set of routines which extend IDL's signal processing capabilities that we are making available. The primary focus of these routines are David Thomson's multitaper methods which are described in detail in 1]. Here we will simply provide an introduction to the routines that come with this package with pointers on how to set them up on local lesystems and where to nd further documentation. We expect that there will be a number of revisions and extensions to this library in the future which we are happy to support. Email correspondance should be directed to B. Pesaran at the above address. Please let us know of anything that needs xing or is unclear to the user. Our goal is for these routines to be useable "stand alone". The collection of les are all IDL procedures, some of them stand-alone, others interface with routines inside IDL or readily compiled C-routines from the LAPACK library of routines. The IDL procedures are documented in a primitive way by accessing the idl help.html document in this directory using any standard Web browser such as Netscape. There is usually an "open le" button on your browser into which you type the path of the html le. To make the use of the library easy, it is best to place the .pro programs in a single directory which you add to the $IDL PATH variable. This allows IDL to access them directly without the user compiling them in advance. For the purposes of this document, we will assume that the les reside in a directory idl lib in your home space, /idl lib. In addition the compiled executable, idl.*.so, must be kept available to IDL. This library is too large to be stored on the LANL site and must be downloaded by anonyous ftp from charybdis.caltech.edu where various versions of it reside in /pub/idl/lib/lapack idl.*.so. We will assume that this library has been placed in the lib directory in your home space, /lib. This directory should then be added to your $LD LIBRARY PATH variable. There are a number of points at which the $IDL PATH and $LD LIBRARY PATH variables can be set. If you are using a tcsh or csh then just add the lines to your .tcshrc or .cshrc le: setenv IDL PATH ~ /idl lib:$IDL PATH setenv LD LIBRARY PATH ~ /lib:$LD LIBRARY PATH …