Module F08JEF in NAG

• NAG Information

• Components
  • Documentation from ITL
  • Example from ITL
  • Example-input from ITL
  • Example-output from ITL

F08JEF

 
Computes all the eigenvalues, and optionally all the eigenvectors, of a real
symmetric tridiagonal matrix, or of a real symmetric matrix which has been
reduced to tridiagonal form. (Alternate name DSTEQR).
 
Classes  :  D4a5 .  Tridiagonal matrix eigenvalue problems
            D4c2a . Compute eigenvalues of tridiagonal matrix
 
Type     : Fortran subroutine in NAG library (F08 sublibrary).
Access   : Proprietary. Many implementations available.
Precision: Double.
 
Usage    : CALL F08JEF (COMPZ, N, D, E, Z, LDZ, WORK, INFO)
 
Details  : Documentation Example Example-input Example-output
Sites    : (1) AIX (2) ITL
 

Implementation of F08JEF from NAG on AIX

 
AIX:       IBM RS6000, National Institute of Standards and Technology (NIST),
           Gaithersburg, MD. Available to NIST staff.
 
Precision: Double.
 
Access available only to NIST staff on internal Unix systems. They may access this
package provided the /itl tree is cross-mounted.
 
   Link         : f77 -o prog prog.f -L/itl/links/generic/lib -lnag
   Documentation: acroread
                  /itl/apps/naglib-19/docs/NAGdoc/fl/pdf/F08/f08jef_fl19.pdf
   Example      : cat
                  /itl/apps/naglib-19/flib619da/examples/source/f08jefe.f
   Example-input: cat
                  /itl/apps/naglib-19/flib619da/examples/data/f08jefe.d
   Example-outpu: cat
                  /itl/apps/naglib-19/flib619da/examples/results/f08jefe.r
 

Implementation of F08JEF from NAG on ITL

 
ITL:       Unix Workstation Network, National Institute of Standards and
           Technology (NIST), Gaithersburg, MD. Available to NIST staff.
 
Precision: Double.
 
Access available only to NIST staff on internal Unix systems. They may access this
package provided the /itl tree is cross-mounted.
 
   Link         : f77 -o prog prog.f {-lcomplib.sgimath}
                  -L/itl/links/generic/{lib lib32 lib64}{/mips3 /mips4}
                  -lnag
   Documentation: acroread
                  /itl/apps/naglib-19/flib619da/NAGdoc/fl/pdf/F08/f08jef_fl19.pdf
   Example      : cat
                  /itl/apps/naglib-19/flib619da/examples/source/f08jefe.f
   Example-input: cat
                  /itl/apps/naglib-19/flib619da/examples/data/f08jefe.d
   Example-outpu: cat
                  /itl/apps/naglib-19/flib619da/examples/results/f08jefe.r