Parse a binary file with different number formats

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Antares 2017-12-14

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https://ww2.mathworks.cn/matlabcentral/answers/372992-parse-a-binary-file-with-different-number-formats

评论： Antares 2017-12-14

Hi, I have a binary file representing a surface, there is a header which provides some info about the surface like sampling rates along x and y axis, number of rows and columns and so on... then there is a series of values which represent values along z axis.

The header is made of short, long and float number formats while z values are in floats. An example can be this:

\\ HEADER: 
-float (type of figure)
-long (number of rows)
-long (number of columns)
-float (x sampling rate)
-float (y sampling rate)
-float (x origin)
-float (y origin)
...... //end of header
float z1
float z2
float z3
and so on

How can I retrieve all the values scanning the file? I tried with fread but I don't know which format option choose

Thanks

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Answer 1

Jan 2017-12-14

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https://ww2.mathworks.cn/matlabcentral/answers/372992-parse-a-binary-file-with-different-number-formats#answer_296287

编辑：Jan 2017-12-14

在 MATLAB Online 中打开

The documentation explains this clearly: doc fread

fid = fopen(File);
if fid == -1, error('Cannot open file %s', File); end
typeOfFigure = fread(fid, 1, 'float');  % -float (type of figure)
numOfRows    = fread(fid, 1, 'long');   % -long (number of rows)
numOfCols    = fread(fid, 1, 'long');   % -long (number of columns)
xSampleRate  = fread(fid, 1, 'float');  % -float (x sampling rate)
ySampleRate  = fread(fid, 1, 'float');  % -float (y sampling rate)
xOrigin      = fread(fid, 1, 'float);   % -float (x origin)
yOrigin      = fread(fid, 1, 'float);   % -float (y origin)
...
fclose(fid);