If you are picking up this software please send e-mail to arpack@caam.rice.edu with the following information ARPACK + PARPACK Instructions: ============= The most current serial ARPACK distribution is contained in the file arpack96.tar.gz Once you have retrieved this file then issue the following command zcat arpack96.tar.gz | tar -xvf - This will create a directory named ARPACK. To add the parallel codes to the ARPACK package, retrieve parpack96.tar.gz Once you have retrieved this file then issue the following command zcat parpack96.tar.gz | tar -xvf - This will add an additional subdirectory (PARPACK) to the ARPACK directory. (ARPACK/PARPACK). Some additional files will be added to the ARMAKES directory as well as updating the Makefile and README files in the top level ARPACK directory. IMPORTANT: Make sure that the tar files for the serial distribution and the parallel distribution are unbundled in the same top level directory. Usually $(HOME). Change to the ARPACK directory and read the file README for further instructions.