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

Question

Farz Tak 2015-10-29

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https://ww2.mathworks.cn/matlabcentral/answers/251778-fread-double-precision-8-byte-floating-point-precision

回答： aijiangzhao aixuwu 2021-10-27

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

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Answer 1

Geoff Hayes 2015-10-30

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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');

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Geoff Hayes 2015-10-30

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 2015-10-30