MATLAB: Precision of a binary file or text file? “fread”

binarydatafidfopenfreadMATLABprecisiontextfile

I am using fopen/fread to read and store my files. I could read them with "importdata" but that was super slow. For using fread, I do not know the precision of the data. How can I know the precision? Attached is one of the files.

Thanks a lot, I have been working on it for two days and could not figure it out yet.

Zeinab

Best Answer

This is an ASCII-file. Then the precision is not meaningful, because it matters binary files only. Do not use fread, but fscanf.

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MATLAB: Am I having trouble reading an ascii file in notepad that I produced using FPRINTF

Using the following syntax will open the file in text mode, allowing it to be read in notepad:

fid=fopen('out.txt','wt');
fprintf(fid,'%i\n',3);
fclose(fid)

This is because of the "t" flag in the FOPEN statement. Without the "t" flag, the ascii file produced will only print one newline character, while PC standard ASCII files expect two different characters, '/r/n'.

This can be demonstrated by the fact that the following syntax also works:

fid=fopen('out.txt','w');
fprintf(fid,'%i\r\n',3);
fclose(fid)

For more information on the FOPEN function, see:

http://www.mathworks.com/access/helpdesk/help/techdoc/ref/fopen.shtml

Best Answer

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