[Octave-bug-tracker] [bug #65390] fscanf produces 1 line too much

[A.R. Burgers]

URL:
  <https://savannah.gnu.org/bugs/?65390>

                 Summary: fscanf produces 1 line too much
                   Group: GNU Octave
               Submitter: arb
               Submitted: Fri 01 Mar 2024 04:10:47 PM CET
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: dev
         Discussion Lock: Any
        Operating System: GNU/Linux
           Fixed Release: None
         Planned Release: None


    _______________________________________________________

Follow-up Comments:


-------------------------------------------------------
Date: Fri 01 Mar 2024 04:10:47 PM CET By: A.R. Burgers <arb>
This example shows a case where fscanf fails I think to correctly read an
input:


np = 101;
x = linspace(0, 1, np)';
a = [x, x.^2];
dlmwrite('tst.dat', a, '\t');
fd = fopen('tst.dat', 'r');
ar = fscanf(fd, '%g %g', [2, Inf])';
fclose(fd);
ar(np - 5: end, :)
try
  [a(np - 5 : end, :), ar(np - 5 : end, :)]
catch me
  error('ran into %s', me.message);
end


octave output, featuring an extra row at the end:


ans =
   0.9500   0.9025
   0.9600   0.9216
   0.9700   0.9409
   0.9800   0.9604
   0.9900   0.9801
   1.0000   1.0000
   1.0000        0

error: ran into horizontal dimensions mismatch (6x2 vs 7x2)
error: called from
    tst at line 12 column 3


matlab output:


ans =
    0.9500    0.9025
    0.9600    0.9216
    0.9700    0.9409
    0.9800    0.9604
    0.9900    0.9801
    1.0000    1.0000

ans =
    0.9500    0.9025    0.9500    0.9025
    0.9600    0.9216    0.9600    0.9216
    0.9700    0.9409    0.9700    0.9409
    0.9800    0.9604    0.9800    0.9604
    0.9900    0.9801    0.9900    0.9801
    1.0000    1.0000    1.0000    1.0000









    _______________________________________________________

Reply to this item at:

  <https://savannah.gnu.org/bugs/?65390>

_______________________________________________
Message sent via Savannah
https://savannah.gnu.org/