Reading a large binary file

37 次查看(过去 30 天)
I want to load a 8 GB binary data file into Matlab. My computer has 24 GB of RAM. It runs out of memory, despite me closing literally everything besides Matlab, and I don't understand why. The file should not take more than its size, right?
Code for loading is simply:
fd = fopen(['data.bin'], 'r');
data = fread(fd, 'int16');
fclose(fd);

采纳的回答

James Tursa
James Tursa 2023-10-18
编辑:James Tursa 2023-10-18
Try
data = fread(fd, '*int16');
When you use 'int16' for the type to read, MATLAB reads as int16 and then converts to double (four times the memory). When you use '*int16', MATLAB keeps the type as int16. E.g.,
% Create a small sample file
fid = fopen('junk.bin','wb');
fwrite(fid,int16(4),'int16');
fclose(fid);
% read it with 'int16'
fid = fopen('junk.bin','rb');
x = fread(fid,'int16')
x = 4
class(x) % double, not what you wanted
ans = 'double'
% read it with '*int16'
frewind(fid);
x = fread(fid,'*int16')
x = int16 4
class(x) % int16, this is what you wanted
ans = 'int16'
fclose(fid);

更多回答(0 个)

类别

Help CenterFile Exchange 中查找有关 Large Files and Big Data 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by