fread + double-precision 8-byte floating point + precision

Hi All,

I want to use fread to read my binary file. The data type are "double-precision 8-byte floating point". When I put 8*double as precision, it gives me weird values that I am sure it is wrong. How can I put both float + double in precision?

Thanks a lot

Answer 1

[Geoff Hayes]

Farz - if the data type (within your file) is double-precision 8-byte floating point, then why not just use double or float64 as either should correspond to 8-byte floating point numbers? Check out fread input argument precision and use fread as (for example)

 A = fread(fileID,[3 3],'double');

[Farz Tak]

Thanks, I realized when I use 'double' precision it gives me strange number. I think the problem is because the data are also Least Significant Byte/little-endian. Now I need to deal with this.

[Geoff Hayes]

Hi Farz - you should be able to set the machine format when you open the file with fopen. See http://www.mathworks.com/help/matlab/ref/fopen.html#inputarg_machinefmt for details.

[Farz Tak]

It is LSB format data but putting 'l' did not help me in reading the data.

Answer 2

[aijiangzhao aixuwu]

Hi,I encountered the same problem, did you solve it? Can you tell me?