Below is a listing of the input/output files which are accessed by the Lanczos program LSVAL for computing singular values of real rectangular matrices on user-specified intervals. Included also is a sample of the input file which LSVAL requires on file 5. The parameters in this file are supplied in free format. File 8 contains the data for the rectangular mxn matrix A. SAMPLE DEFINITIONS OF THE INPUT/OUTPUT FILES FOR LSVAL ------------------------------------------------------------------ *LSVAL EXEC FOR LANCZOS SINGULAR VALUE CALCULATIONS FI 06 TERM FILEDEF 1 DISK &1 NSHISTOR A (RECFM F LRECL 80 BLOCK 80 FILEDEF 2 DISK &1 SVHISTOR A (RECFM F LRECL 80 BLOCK 80 FILEDEF 3 DISK &1 GOODEV A (RECFM F LRECL 80 BLOCK 80 FILEDEF 4 DISK &1 ERRINV A (RECFM F LRECL 80 BLOCK 80 FILEDEF 5 DISK LSVAL INPUT A (RECFM F LRECL 80 BLOCK 80 FILEDEF 8 DISK &1 INPUT A (RECFM F LRECL 80 BLOCK 80 FILEDEF 11 DISK &1 DISTINCT A (RECFM F LRECL 80 BLOCK 80 LOAD LSVAL LSSUB LSMULT ------------------------------------------------------------------- SAMPLE INPUT FILE FOR LSVAL ------------------------------------------------------------------------ LANCZOS SINGULAR VALUE PROCEDURE, WITHOUT REORTHOGONALIZATION BUT WITH BIDIAGONALIZATION. LINE 1 M N KMAX NMEVS MATNO 100 100 300 1 2220 LINE 2 SVSEED RHSEED MXINIT MXSTUR 49302312 7549309 5 100000 LINE 3 ISTART ISTOP 0 1 LINE 4 IHIS IDIST IWRITE IPAR 1 0 1 2 LINE 5 RELTOL(RELATIVE TOLERANCE USED IN 'COMBINING' COMPUTED GOOD EIGE .0000000001 LINE 6 MB(1) MB(2) MB(3) MB(4) (ORDERS OF T(1,MEV) MUST BE EVEN 280 LINE 7 NINT (NUMBER OF BISEC INTERVALS) 1 LINE 8 LB(1) LB(2) LB(3) LB(4) (LOWER BOUNDS OF THESE INTERVA 0.0 LINE 9 UB(1) UB(2) UB(3) UB(4) (UPPER BOUNDS OF THESE INTERVA 1.0 ------------------------------------------------------------------------