converting -v5 files to -v7 and -v7.3

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Elad
Elad 2016-6-8
评论： Walter Roberson 2016-6-8
hello,
I receive a .mat file -v5 file constructed of many structures within it. The file is originated from some c code and facilitates some signal measurements. The file weighs roughly 5 Mbt. The problem is when I try to covert it to another format with the command save(fileName,'A','-v7') where A is my superstructure contained in the mat file, for example, it doesn't change the type. meaning, when I type in cmd: type('fileName.mat') I receive the following : MATLAB 5.0 MAT-file. Although the new file now weighs 1.7 Mbts. Stranger is, when I type save(fileName,'A','-v7.3') new file is indeed formatted in -v7.3 but now weights 300 Mbt.
can anybody help in figure out what is going on?
Elad

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Walter Roberson
Walter Roberson 2016-6-8
-v7 files use "MATLAB 5.0" in their internal header. -v7.3 files use "MATLAB 7.3" in their internal header.
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Titus Edelhofer
Titus Edelhofer 2016-6-8
Hi Elad,
v7 is a compressed format while v7.3 is an uncompressed format. Depending on the type of data this makes a huge difference...
Titus
Walter Roberson
Walter Roberson 2016-6-8
-v7.3 is not necessarily uncompressed, but it can be tricky to get compression turned on correctly.

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