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Out of memory - opening a big file

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Francesco
Francesco 2011-10-19
I have to open a very big file (220mega) and i used "textscan", but after a few minutes it returns "Out of memory. Type HELP MEMORY for your options.
Is it possibile to solve this memory problem?
Thanks in advance.

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回答（2 个）

Nirmal Gunaseelan
Nirmal Gunaseelan 2011-10-19
The tech note provides some general guidelines for handling out of memory errors.
In your case, I'd suggest reading data in pieces. For example,
C = textscan(fid, 'format', N)
can be run many times with the same FID and all the C's can be eventually combined. Some examples are the TEXTSCAN doc.
Walter Roberson
Walter Roberson 2011-10-19
220 megabytes is not very much, and should only cause a problem if you are representing the data in larger datatype than it needs. For example, if you are reading a 1 or 2 digit number, then you would be better using a format specifier that instructs textscan to store as int8 or uint8. Reading a whole string of 10010101<etc> and telling textscan to store each character as a double precision number would use a lot of storage.

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