[Octave-bug-tracker] [bug #46493] Incorrect result from fscanf and scanf

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?46493>

                 Summary: Incorrect result from fscanf and scanf
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Sat 21 Nov 2015 06:02:43 PM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: Richard Suchland
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.0.0
        Operating System: Microsoft Windows

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Details:

While developing a script to read and plot weather station data from a CSV
file using fscanf, I got an unexpected result.  After some analysis I tracked
it to fscanf reading a
particular reacord.  It didn't seem to be a error in the data record and my
orignial thought was an issue with the size of the data (this occurred on the
4324th record in the
CSV file).  Then I tried reading in the data as bytes converting to characters
and using sscanf, but got the same result.  Then I cleared memory and executed
the following
standalone script which replicated the issue without the concern for memory. 
The problem is that fscanf did not read all of the "bad" record data.


format short g
good = '"11/7/2015 6:24:00
PM","46","46","48","69.2","99","46.2","28.82126","13.5","11/8/2015 11:03:00
AM","6.835083","42","7.456454","270","9.320568"';
bad = '"11/7/2015 6:36:00
PM","47","48","48","69.6","96","47.8","28.82126","13.47","11/7/2015 5:08:00
PM","2.485485","48","1.864114","270","6.213712"';
frm = '"%i/%i/%i %i:%i:%i %2s" , "%i" , "%i" , "%i" , "%f" , "%i" , "%f" ,"%f"
, "%f" , "%i/%i/%i %i:%i:%i %2s" , "%f" , "%i" , "%f" , "%f", "%f"\n';
v = sscanf(good,frm)'

v =

 Columns 1 through 14:

          11           7        2015           6          24           0      
   80          77          46          46          48        69.2          99 
      46.2

 Columns 15 through 28:

      28.821        13.5          11           8        2015          11      
    3           0          65          77      6.8351          42      7.4565 
       270

 Column 29:

      9.3206

size(v)

ans =

           1          29


v = sscanf(bad,frm)'

v =

 Columns 1 through 14:

          11           7        2015           6          36           0      
   80          77          47          48          48        69.6          96 
      47.8

 Columns 15 through 21:

      28.821       13.47          11           7        2015           5      
    0

>> size(v)
ans =

           1          21

>>





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