Put float data into mat-file using fwrite function

Question

R Zh 2012-8-17

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/46196-put-float-data-into-mat-file-using-fwrite-function

I am writing a program in C, its job is: get datas from txt file and put them into a mat file. I use fwrite function to write the data, codes as below:

fwrite(&data, typesize, 1750, pf);

but it doesn't always works, when the data type is float, it may cause the mat file load failure.

    ??? Error using ==> load
    Unable to read MAT-file
    D:\out.mat
    File may be corrupt.

e.g.

    if it writes 1750 datas like 1.005312, the file corrupt.
    if it writes 1750 datas like 0.369306 or 1699300.000000, it works very well.

Is the type float in C the same to Single in matlab? or How to fix it?

Kindly help!

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Answer 1

R Zh 2012-8-20

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链接

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https://ww2.mathworks.cn/matlabcentral/answers/46196-put-float-data-into-mat-file-using-fwrite-function#answer_56680

在 MATLAB Online 中打开

Solved, the mat-file should be a binary file, codes as bellow,

pf = fopen( OutFileName, "wb+");

Thanks all the same.

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Walter Roberson 2012-8-20

Jan, notice that double-quotes were used in the wb+ string. That gives us the clue that the line is C or C++ code, not MATLAB code.

Also, .mat files can be accessed with fwrite() . It is more often a nuisance to do so for variables that were compressed in place, but compression is optional and variables that are not compressed are in binary format suitable for fwrite()

Jan 2012-8-20

@Walter: I obviously misunderstood the intention of the OP. Of course MAT file can be written using FWRITE, because this command can create every file, which can be created. But this is neither secure nor comfortable. I've deleted my comment which unfortunately reduces the power of your reply. Sorry.

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