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How to save data in a raw file?

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joseba gonzalez
joseba gonzalez on 28 Feb 2019
Commented: Fady Samann on 7 Sep 2020
Hi,
I am quite new in MAtlab and I would like to have some help,
I have a sine with amplitude and time and I want to save the amplitude data into a raw file. How can I get it? I have tried with the code above.
I am not sure if it is correct. So I would like to know if it is correct or in other way, how can I do it in a correct way. Thank you in advance.
fid=fopen('Profilevoltage.raw','w');
fwrite(fid,amplitude,'uint16');
fclose(fid);

  2 Comments

Bob Thompson
Bob Thompson on 28 Feb 2019
What do you mean by 'raw' file? Is that an actual file type, or are you meaning a basic ascii or binary file?
joseba gonzalez
joseba gonzalez on 28 Feb 2019
Hi Bob,
First of all, thank you for answering.
Is an image file type where I have to use it to upload this data into a machine which only reads data in ".raw" file type. And yes it is a binary file, that is saved like an image.
I don´t know if I have explained myself correctly.

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Answers (2)

Namwon Kim
Namwon Kim on 21 Oct 2019
Your code,
fid=fopen('Profilevoltage.raw','w');
fwrite(fid,amplitude,'uint16');
fclose(fid);
I recommend that you try those codes.
Use a matrix transpose
fid=fopen('Profilevoltage.raw','w+');
fwrite(fid,amplitude','uint16');
fclose(fid);

  3 Comments

Fady Samann
Fady Samann on 5 Sep 2020
it worked for me, thanks. But why the matrix transpose? How the 'fwrite' is saving the data?
Namwon Kim
Namwon Kim on 7 Sep 2020
By default, 'fwrite' writes values from an array in column order as 8-bit unsigned integers.
Fady Samann
Fady Samann on 7 Sep 2020
thanks for the answer

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Shane Gibbs
Shane Gibbs on 28 Feb 2019
I believe I found someone with the same issue as well.
Hope this helps!

  2 Comments

joseba gonzalez
joseba gonzalez on 28 Feb 2019
Hi Shane,
Thank you for answering,
The main point is that I have the plot data saved in .txt file but I have problems when saving this data in .raw file type...
Bob Thompson
Bob Thompson on 28 Feb 2019
If the data is being saved in a binary format, then you can just label the file as '.raw' rather than '.txt'. You do need to make sure you are saving it in a binary compatible file format first though.

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