how can i read unformatted binary file into matlab

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anne ellis 2017-6-28

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https://ww2.mathworks.cn/matlabcentral/answers/346679-how-can-i-read-unformatted-binary-file-into-matlab

评论： Walter Roberson 2017-7-22

i have a fortran code which writes a binary file in the following statement

open(21,file=anum('press',itime),form=format_mode)
    write(21) rtime,itime,dt,nx0,ny0,nz,deltax,deltay,rlenz
    write(21) rw
    close(21)

i now want to view the file in matlab, i have tried fread with a variety of options, but i cannot get the date in the format i want it. the variable is rw and represents the pressure at x,y,z. the size of the array should be 256x512x390, so essentially i want to see the data in matlab as say a x array a y array etc with the associated values.

i am really struggling to understand how i can really do this, any guidance will be extremely helpful

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Walter Roberson 2017-7-22

编辑：Walter Roberson 2017-7-22

What was the value of format_mode ?

What are the fortran data types of rtime, itime, dt, nx0, ny0, nz, deltax, deltay, rlenz and are they scalars or arrays?

Walter Roberson 2017-7-22

I suggest that as a test you create a 3D array with integral values but the same datatype as rw, and write it out to file, and then experiment with retrieving it. For example you could store triples 100*first_index + 10 * second_index + third_index for those from 1 3, 1 to 5, and 1 to 4, so values like 243 at rw(2,4,3) so that in the data you read you can immediately tell how to transform the data into the order needed.

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