Saving large matrices WITHOUT hdf5

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Jason Corso
Jason Corso 2014-4-28
评论： Walter Roberson 2014-4-29
I have a large matrix currently stored in .mat v7.3 format that I need to read into another program. This program can read normal .mat files without problem, but can't handle HDF5 files. This is a problem, since Matlab refuses to save the variable in anything but a -v7.3 file.
How can I force Matlab to save this variable in a non-HDF5 file?

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回答（3 个）

Chad Greene
Chad Greene 2014-4-28
A = rand(4,3,2,5);
dlmwrite('mydata.txt',A)
Walter Roberson
Walter Roberson 2014-4-28
What formats are supported by the other program?
You can fwrite() the data as binary. Note that if you fwrite() anything with 2 or more dimensions, the memory is written "down" columns, corresponding to varying the earlier dimensions more rapidly than the later dimensions.
Jason Corso
Jason Corso 2014-4-29
I suppose those are options, but they'd require writing all new I/O code for the other program, which is currently set up quite nicely to read (non-HDF5) .mat files. So really, what I want is to force Matlab to save the matrix to a v7 or earlier .mat file.
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Walter Roberson
Walter Roberson 2014-4-29
If the matrix is 2 Gb or larger (I think it is, 4 Gb max for sure) then there is no way to store it in a v7 .mat file. v7 .mat files include size fields that are limited to 32 bits.

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