GNU Octave, version 2.0.17 (i586-pc-linux-gnu).
Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002 John W. Eaton.
This is free software with ABSOLUTELY NO WARRANTY.
For details, type `warranty'.

octave> [myfile, msg] = fopen("weight.dat", "r")
myfile = 3

msg = 

octave> myfile
myfile = 3
octave> stderr
stderr = 2
octave> line = fgetl(myfile)
line = 65 130
octave> line = fgetl(myfile)
line = 68 170
octave> fclose(myfile)
error: `mmyfile' undefined near line 9 column 8
error: evaluating expression near line 9, column 8
error: evaluating argument list element number 1
error: evaluating index expression near line 9, column 1
octave> fclose(myfile)
ans = 0
octave> [myfile, msg] = fopen("weight.dat", "r")
myfile = 3

msg = 

octave> [myfile2, msg] = fopen("weight.dat", "r")
myfile2 = 4

msg = 

octave> [myfile3, msg] = fopen("weight.dat", "w")
myfile3 = 5

msg = 

octave> fclose(5)
ans = 0
octave> fclose(4)
ans = 0
octave> [val, count=fscanf(myfile, "%f %f")
> 
octave> [val, count]=fscanf(myfile, "%f %f\n")
val = [](0x1)

count = 0

octave> valu
error: `valu' undefined near line 16 column 1
error: evaluating expression near line 16, column 1
octave> val
val = [](0x1)
octave> [val, count]=fscanf(myfile, "%d %d\n")
val = [](0x1)

count = 0

octave> [val, count]=fscanf(myfile, "%d %d\n")
val = [](0x1)

count = 0

octave> fclose(myfile)
ans = 0
octave> [myfile, msg] = fopen("weight.dat", "r")
myfile = 3

msg = 

octave> [val, count]=fscanf(myfile, "%d %d\n")
val = [](0x0)

count = 2

octave> fclose(myfile)
ans = 0
octave> [myfile, msg] = fopen("weight.dat", "r")
myfile = 3

msg = 

octave> [val, count]=fscanf(myfile, "%d %d\n")
val = [](0x0)

count = 2

octave> [val, count]=fscanf(myfile, "%d %d")
val =

   68
  170
   67
  170
   74
  170
   71
  160
   72
  160

count = 10

octave> val
val =

   68
  170
   67
  170
   74
  170
   71
  160
   72
  160

octave>