Fread problem...

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jason beckell
jason beckell 2012-1-26
Hello to everyone!
I have a problem with the following simple portion of code:
b = rand(5, 1);
fid = fopen('prova.bin', 'w');
fwrite(fid, b);
fclose(fid);
% Read the contents back into an array
fid = fopen('prova.bin');
B = fread(fid, 5, 'double');
fclose(fid);
Fread doesn't seem to work, how come ? Has any of you got an idea?
Thank you very much and my best regards! Jason.

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回答（2 个）

Thomas
Thomas 2012-1-26
Add type 'double' in your fwrite
b = rand(5, 1);
fid = fopen('prova.bin', 'w');
fwrite(fid, b,'double'); % add type double here
fclose(fid);
% Read the contents back into an array
fid = fopen('prova.bin');
B = fread(fid, 5, 'double');
fclose(fid);
should work
Bård Skaflestad
Bård Skaflestad 2012-1-26
You need to specify the precision of the data you output using fwrite is double. Otherwise, the subsequent fread operation fail. I'd write the above as
b = rand(5, 1);
fid = fopen('prova.bin', 'w');
fwrite(fid, b, 'double');
fclose(fid);
% Read the contents back into an array
fid = fopen('prova.bin');
B = fread(fid, 5, 'double');
fclose(fid);

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