I have a float array :
float[] samples32array
I need to convert it into a binary file so I can read it in matlab.
Is there any way to do that?
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1Well do you have any documentation as to the format that Matlab expects?Jon Skeet– Jon Skeet2015-06-03 19:24:34 +00:00Commented Jun 3, 2015 at 19:24
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mathworks.com/help/matlab/ref/fread.html?refresh=true#bt3twl9-1axcelenator– axcelenator2015-06-03 19:27:58 +00:00Commented Jun 3, 2015 at 19:27
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3 Answers
It's simple. First, you should use FileStream and create a file. Then, you can use BinaryWriter, which can write any C# datatype into an underlaying stream, such as a FileStream.
using (FileStream file = File.Create(path))
{
using (BinaryWriter writer = new BinaryWriter(file))
{
foreach (float value in samples32array)
{
writer.Write(value);
}
}
}
Since the constructor of BinaryWriter accepts the basic type Stream, any stream type can be used. It works for file streams as well as NetworkStream or a MemoryStream etc. It's a very generic class.
And please avoid converting the float[] into a byte[] beforehand as it will allocate memory and this is bad if your array is big (don't know if that's the case for you).
1 Comment
Matt Kleinsmith
using System.IO;You can use BinaryWriter to write the data to a file very easily:
foreach (var value in samples32array)
{
writer.Write(value);
}
Now BinaryWriter is guaranteed to use little-endian format, so in your Matlab call, you should specify a machinefmt value of l to explicitly read it in little-endian format too.
1 Comment
axcelenator
Hello Jon, I use matlab to read the file like this: fid = fopen('myRecordBin.bin', 'r'); fread(fid,inf,'float',4,'l'); Now, I can read it and matlab's workspace show 69222 elements and in the vector it shows: 69222x1 double. But my original float array(and not double) in c# is twice: 138444 elements. Is something wrong with my reading?
This SO answer shows a way to convert a float array into a byte array. Then you can use File.WriteAllBytes() method to write it out to a file. How MatLab reads it, though, will be the issue.
I found some documentation for MatLab for the fread command. It looks like is has some arguments that will allow you to define the precision of the read. You may be able to use "float" as the precision value. Though, the is a bit of an educated guess as I am not very familiar with MatLab.
