Show older comments. Haoliang Yu on 13 Sep Vote 0. Commented: Image Analyst on 14 Sep I have a binary data generated by Fortran, I am able to read my data:.
I need to make some changes in the data and then write it out as a binary file for Fortran. I attached a 'good' binary data, please see if you know how to read and write it properly for Fortran.
Thank you for your time. Answers 2. James Tursa on 13 Sep Cancel Copy to Clipboard. No header stuff to worry about. Open a file named nine. Specify write access using 'w' in the call to fopen. Write the 25 elements of the 5-by-5 magic square. Write a binary file containing the elements of the 4-by-4 magic square, stored as double-precision floating-point numbers. Open the file, magic4. Specify the file-access type, 'a' , in the call to fopen.
Write random double-precision numbers to a file named myfile. Specify a machinefmt value of 'ieee-be' in the call to fwrite , to indicate big-endian byte ordering.
File identifier, specified as an integer obtained from fopen , 1 for standard output the screen , or 2 for standard error. While fwrite supports writing character or string data, doing so can result in unexpected behavior and is therefore not recommended. If you use fwrite to write character or string data, specify the text encoding when calling fopen to open the file for reading or writing and specify the precision as char.
Example: [1,2,3;4,5,6]. Data Types: single double int8 int16 int32 int64 uint8 uint16 uint32 uint64 logical char string Complex Number Support: Yes. Class and size in bits of the values to write, specified as one of the character vectors or string scalars listed in the Precision column. As Bill the Lizard wrote you can use fread to load the data into a vector. I just want to expand a little on his answer. The commands fopen and fread default to Little-endian[1] encoding for the integers.
If your file is Big-endian encoded you will need to change the fread to. As for witting the data to a file. The command, fwrite , in Bill's answer will write to a binary file. If you want to write the data to a text file you can use dlmwrite. The machine format IE, ieee-be , ieee-le , vaxd etc. Details of the supported machine format can be found in Matlab's documentation of fopen.
Scott French's comment to Bill's answer suggests reading the data into an int16 variable. To do this use. Assuming you know how many values you have stored in the file, you can do something like this to read the data into an array.
As far as performance tuning goes, you can read data in chunks to only use as much as you need to process. Submit Next Question. By signing up, you agree to our Terms of Use and Privacy Policy. Forgot Password? This website or its third-party tools use cookies, which are necessary to its functioning and required to achieve the purposes illustrated in the cookie policy. By closing this banner, scrolling this page, clicking a link or continuing to browse otherwise, you agree to our Privacy Policy.
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