FSEEK error while running Matlab function

I got this error while running a function in Matlab

"Error using fseek Invalid file identifier. Use fopen to generate a valid file identifier."

The overall command of the function is:

function [global_mean_vec, global_var_vec, total_fr_no]=global_mean_var_for_hmm_skips_1gau(traininglist_filename,model_filename_old, model_filename_new)
if nargin ==0
    traininglist_filename='training_list.mat';
    model_filename_old='hmm_with_skips.mat';
    model_filename_new='hmm_with_skips_new.mat'; 
end;
load(model_filename_old, 'mean_vec_i_m', 'var_vec_i_m', 'a_i_j_m');
load(traininglist_filename,'list');

[dim,N,MODEL_NO]=size(mean_vec_i_m);

% allocate mean vectors of states of models
vector_sum=zeros(dim,1);
vector_squared_sum=zeros(dim,1);

total_fr_no = 0;
utterance_no=size(list,1);
for k=1:utterance_no
        filename=list{k,2};
        m=list{k,1}; % word ID 
        fid=fopen(filename,'r');
        fseek(fid, 12, 'bof'); % skip the 12-byte HTK header
        c=fread(fid,'float','b');
        fclose(fid);
        fr_no=length(c)/dim;
        c=reshape(c,dim,fr_no);

          total_fr_no = total_fr_no + fr_no;
          vector_sum=vector_sum+sum(c,2);
          vector_squared_sum=vector_squared_sum+sum(c.*c,2);
  end %for k=1:utterance_no

global_mean_vec=vector_sum/total_fr_no;
global_var_vec=vector_squared_sum/total_fr_no - global_mean_vec.*global_mean_vec;
% model initilizatiion 
for m=1:MODEL_NO
   for i=2:N-1;
         mean_vec_i_m(:,i,m) = global_mean_vec;
         var_vec_i_m(:,i,m)= global_var_vec;
   end
end

save(model_filename_new, 'mean_vec_i_m', 'var_vec_i_m', 'a_i_j_m');
fprintf('%s initialized with global mean vector and variance vector\n', model_filename_new);

Answer 1

[dpb]

The error says the file handle is invalid --

...
fid=fopen(filename,'r');
fseek(fid, 12, 'bof'); % skip the 12-byte HTK header

You don't check the result of fopen so one must presume that the call failed...are the desired files in the CWD or in a subdirectory on the MATLABPATH? Not being is a common failure cause.

[fid,message]=fopen(filename,'r');
if fid<0, error(message), end

will let you know what happened and the cause.

[N Rh]

Error message "message =

No such file or directory" Despite that all files exist. I don't understand the error.

[Walter Roberson]

Are the loaded file names fully qualified, drive and directory and all? Or are they using relative paths? If they are relative then have you checked that you are cd to the directory you think you are using? Have you told File Explorer to show file extensions and checked that they match the names being loaded?

[Jan]

@N Rh: Matlab tells you clearly and unequivocally, that the corresponding file does not exist. Therefore the claim "despite that all files exist" must be wrong. You are either looking in the wrong folder or there is a typo in the names. Trust Matlab. When it cannot find a file, it is not there.

You can expand the error message:

error(['Missing file:   %s', char(10), ...
       'Current folder: %s', char(10), ...
       'Message:        %s'], filename, cd, message);