Is it possible to create a binary vector then write it to a file?

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Tai Doan
Tai Doan 2016-5-20
回答： Walter Roberson 2016-5-20
Hi Matlab Comminity,
I am new to Matlab. I am working on an excercise which requires some binary operations, then write binary result in a file. Each character in the file must be 1 bit.
I tried looking for "binary datatype in Matlab", but it seems does not exist. I am little bit disappointed.
Could you guys give me some suggestions? What would you do when you want to work with binary number in Matlab?
Thank you so much!

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回答（2 个）

Walter Roberson
Walter Roberson 2016-5-20
fwrite(fileID, B, 'ubit1')
Caution: bits are only packed for any one call to fwrite(). Each time the data for an fwrite is finished outputting, if the bit stream is not aligned with a byte boundary then extra bits are written out to get to the byte boundary, leaving it positioned at a byte boundary for the next I/O call.
Azzi Abdelmalek
Azzi Abdelmalek 2016-5-20
you can work with logical data type
a=logical([1 0 0 1])
  1 个评论
Tai Doan
Tai Doan 2016-5-20
Thank you, Azzi! Is there any way to write them into a file as binary character? This is what I tried:
B = ones(1,1000);
B = logical(B);
fileID = fopen('binary', 'w');
fwrite(fileID,B);
fclose(fileID);
But the file's size is 1000 bytes, not 1000 bits. Any idea?

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