Checking the gigantic unformatted file generated in FORTRAN -

the output of fortran program gigantic (300gb) unformatted file. ( in fact, file includes time evolution of xyz coordinates of many many particles. so, data type real*8, if matters @ all)

the problem not sure if of data written correctly, because of transient issue in computational server. now, im left gigantic file, , looking way check if of content healthy!

is there way check weather of xyz's written correctly, , not corruptedly (say nan)?

in addition dwwork's method of checking nans, can check infinity. after that, simple matter of reading file , looping through every value. since wrote file, assume can read it.

  program testinfnan    implicit none    real*8 :: x, y, z    logical :: xnan, ynan, znan, xinf, yinf, zinf    z = 1.   x = z / 0.   y = x / x     print *, ''   print *, 'x = ', x   print *, 'y = ', y   print *, 'z = ', z    xnan = x /= x   ynan = y /= y   znan = z /= z    print *, ''   print *, 'xnan = ', xnan   print *, 'ynan = ', ynan   print *, 'znan = ', znan    xinf = x == 1./0   yinf = y == 1./0   zinf = z == 1./0    print *, ''   print *, 'xinf = ', xinf   print *, 'yinf = ', yinf   print *, 'zinf = ', zinf    end program testinfnan 

output:

x =                 infinity y =                      nan  z =    1.00000000000000      xnan =  f ynan =  t znan =  f  xinf =  t yinf =  f zinf =  f