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Unofficial Format Specification
of the IDL ``SAVE'' File

Craig Markwardt1

Last Modified


I describe the file format of IDL SAVE files, and a set of accessor routines written in IDL which can read and write SAVE files directly. Data and compiled functions in an IDL session can be stored on a disk file, and restored to a new session at a later point in time. The data are stored using a tag-based format to encourage forward and backward compatibility. Programmers who wish to implement the ability to read, write and interrogate SAVE files, and people who are just interested in ``how it works'' should read this document.


... Markwardt1
Copyright © 2000,2001,2002,2003,2009 by Craig B. Markwardt. This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike License. To view a copy of this license, visit or send a letter to Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305, USA.

Craig Markwardt 2011-12-21