problem with the function "fread"

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Antonis Koutsis
Antonis Koutsis 2021-1-15
回答： Jeremy Hughes 2021-1-15
i have to read a .txt file , given by my professor, and i wrote the following code
fid=fopen('shannon_odd.txt','r'); %open file
x=fread(fid,'*char'); %read file chars
binary = dec2bin(x,8); %char->binary
binary_t=transpose(binary);
binf=binary_t(:)-'0'; %vector of binary bits of file
binf=binf.';
and when i run the program, this error came at command window:
  2 个评论
Ive J
Ive J 2021-1-15
Is your text file within current working directory?
Antonis Koutsis
Antonis Koutsis 2021-1-15
it was the first thing that i had checked before i post this

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回答（1 个）

Jeremy Hughes
Jeremy Hughes 2021-1-15
The error indicates that fopen returned an invalid file ID.
Try this:
[fid,msg] = fopen(filename)
if fid < 0
error(msg)
end
More than likely, the file is not in the current working directory. try
which('shannon_odd.txt')
That will show you if the file is being found, if it doesn't give a result, you'll need to provide the full path to the file.
HTH

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