Starting diary file diary-16-May-2018.txt
LanczosDemo

whos
  Name                     Size              Bytes  Class     Attributes

  A                     1000x1000            23992  double    sparse    
  d                        1x25                 50  char                
  dfile                    1x21                 42  char                
  displayselection         1x1                   8  double              
  e                     1000x1                8000  double              
  m                        1x1                   8  double              
  maxe                     1x1                   8  double              
  mine                     1x1                   8  double              
  mm1                      1x1                   8  double              
  mm2                      1x1                   8  double              
  q                     1000x1                8000  double              
  recomp                   1x1                   8  double              
  steplabel                1x15                120  double              
  whichbound               1x1                   8  double              

size(A)
ans =
        1000        1000
spy(A)
plot(diag(A),'.')

LanczosFullReorthog
start performing Lanczos, print step number
i =
    10
...
start extracting Ritz values, print step number
i =
    10
...
largest deviation of singular value of Lanczos vector matrix Q from 1 =
ans =
   1.3323e-15
done with extracting eigenvalues, bounds
done with figure 1
pause (hit return to continue)

m=150;
LanczosNoReorthog
start performing Lanczos, print step number
i =
    10
...
i =
   150
start extracting Ritz values, print step number
...

sminx =
    1.0000

done with extracting eigenvalues, bounds
pause (hit return to continue)

done with figure 1
pause (hit return to continue)

exit