Re: How to fix this error?

[James Sherman Jr.]

First, the fscanf error is because the fid that you give it (from
fopen) is -1 which means that fopen failed for whatever reason.  You
should probably check that, after fopen is called, that fid is greater
than 0, and thus a valid fid.

Secondly, the reason that it is probably failing is that you're
indexing into your ratio matrix incorrectly (or at least not the way I
think you mean to index it).  When you have ratio typed out like that,
octave uses it like a 2D array where (for example) the 2,2 element is
1 (out of t11).  I think a better way to get what you're after is to
try something like this:

ratio = [10, 11, 12, 13, 14, 15, 16, ..., 120];

for i = 1:length(ratio)
   filename = sprintf('t%d.dat', ratio(i));

   fid = fopen(filename, 'r');

   if (fid < 0)
      printf('Couldn't open file %s', filename);
   else,
      <rest of your function>
   end

end

Hope this helps.

On Wed, Jul 22, 2009 at 10:47 PM, Ramesh
Yapalparvi<address@hidden> wrote:
> Hi all,
>
> I am trying to run a mfile in octave.  I am reading a bunch of files in this
> form
>
> ratio= ['t10  ';'t11  ';'t12  ';'t13  ';'t14  ';'t15  ';'t16  ';'t17
> ';'t18  ';'t19  ';          't110 ';'t111 ';'t1115';'t112 ';'t113 ';'t114
> ';'t115 ';'t116 ';'t117 ';'t118 ';'t119 ';          't120 '];
>
> where t10.... are data files containing 3 columns
>
> I give this command
>
> [nn,mm]=size(ratio)
>
> for i=1:nx (nx=22)
>     name = strcat(ratio(i:nn:nn*mm),'.dat');
>
>     fid=fopen(name,'r');
>
>     A1x = fscanf(fid,'%f',[3,inf]);
>     A1x = A1x';
>
> I get the following error
>
> error: fscanf: invalid stream number = -1
>
>
> I know this is something related to fscanf. If anybody has any idea please
> let me know. Thanks
>
> Ramesh
>
>
>
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