error using "fread"

Hi. in the below i wrote my code and i have this error. please help me

error

Error using fread

Invalid file identifier. Use fopen to generate a valid file identifier.

Error in statistics (line 12)

h=fread(e, [442,503], 'uint16');

code

clc

clear

close all

cd('E:/image_trans/Emis32_%d.bin');

fntest = dir('*.raw');

testnum = size(fntest,1);

rows=442; cols=503; bands=1; datatype='float32';

for i=1:732

f=sprintf('E:/image_trans/Emis32_%d.bin',i);

e=fopen(f);

h=fread(e, [442,503], 'uint16');

d=h(:);

data(i,:)=h';

fclose(f);

end

Answer 1

[Jan]

cd('E:/image_trans/Emis32_%d.bin');

This does not look like a valid folder name. Is there really a % character? Later on this is used as a file name.

Whenever you open a file, check for the success:

[e, msg] = fopen(f);
assert(e > 0, msg);  % Show the message, if fopen failed

You create the file handle called "e" with fopen, but try to close "f" with fclose.

I guess, this cleaned version is working:

Folder = 'E:/image_trans/'; 
fntest = dir(fullfile(Folder, '*.raw')); 
rows   = 442;
cols   = 503;
data   = zeros(numel(fntest), rows * cols);  % pre-allocate for speed
for i = 1:numel(fntest) 
    file = fullfile(Folder, fntest(i).name);
    [fid, msg] = fopen(file, 'r');
    assert(fid > 0, msg);
    data(i, :) = fread(fid, [1, rows*cols], 'uint16');
    fclose(fid);
end