read file variables methods

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Talmon Alexandri
Talmon Alexandri 2016-11-11
评论： per isakson 2016-11-14
I got a large data matrix (3Gb) of signal data which I saved to a .mat file. Since the data size is large I figured out it will be wiser to access the file and read each time a block of data, process it and move to the next block instead of loading the complete file. I'm wondering should I use the matfile method, fopen and fread or should I use a datastore and read command. What is faster from the processing point of view and easier to work with? Or any other considerations? Thanks
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Talmon Alexandri
Talmon Alexandri 2016-11-12
data set - plain numerical array 10 million lines by 48 columns Total RAM size - 3G
per isakson
per isakson 2016-11-14
Given
  1. "large data matrix (3Gb) of signal data which I saved to a .mat file"
  2. "Total RAM size - 3G[B]"
  3. "[one] plain numerical array 10 million lines by 48 columns"
I assume the mat-file is version 7.3, because that's needed to store an array of that size.
I would say this a a perfect case for matfile, Access and change variables directly in MAT-files, without loading into memory.
It's the easiest to work with and I don't think there is any other way that is significantly faster.

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Walter Roberson
Walter Roberson 2016-11-11
I think maybe using memmapfile and a binary file might be easiest for access.

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